California: lake and river algae advisories

900 waters appear in the records of the California State Water Resources Control Board. Waters whose latest record is an advisory come first.

Browse California by county.

An advisory ends only when the state records a later "None" (no advisory recommended) at the same spot, or an end date. A blank end date is unknown.

Waters in California and what the state's latest record says
Water	Latest record
Agua Hedionda Creek	Algal mat alert sign, last posted Aug 24, 2023. No all-clear recorded.
Alder Creek	Algal mat alert sign, last posted Aug 23, 2022. No all-clear recorded.
Alpine Pond	Caution advisory, last posted Aug 29, 2025. No all-clear recorded.
American River	Caution advisory, last posted May 25, 2021. No all-clear recorded.
American River	Caution advisory, last posted Sep 29, 2025. No all-clear recorded.
Anada Creek	Caution advisory, last posted Apr 26, 2021. No all-clear recorded.
Antelope Creek	Caution advisory, last posted Sep 9, 2021. No all-clear recorded.
Antelope Lake	Caution advisory, last posted Nov 25, 2025. No all-clear recorded.
Antioch Dunes National Wildlife Refuge	Caution advisory, last posted Jul 21, 2021. No all-clear recorded.
Apollo Park Lake	Caution advisory, last posted Oct 15, 2026. No all-clear recorded.
Arastradero Lake	Danger advisory, last posted Apr 2, 2025. No all-clear recorded.
Arnot Creek	Caution advisory, last posted Aug 12, 2021. No all-clear recorded.
Arroyo Seco	Algal mat alert sign, last posted May 9, 2025. No all-clear recorded.
Ash Creek	Caution advisory, last posted Sep 29, 2021. No all-clear recorded.
Ash Creek	Caution advisory, last posted Jul 1, 2021. No all-clear recorded.
Atascadero Lake	Caution advisory, last posted Jul 16, 2024. No all-clear recorded.
Baker Pond	Caution advisory, last posted Oct 11, 2022. No all-clear recorded.
Barry Creek	Algal mat alert sign, last posted Nov 13, 2020. No all-clear recorded.
Bass Pond	Caution advisory, last posted May 21, 2026. No all-clear recorded.
Battle Creek	Algal mat alert sign, last posted Sep 17, 2026. No all-clear recorded.
Bear Creek	Algal mat alert sign, last posted Aug 18, 2025. No all-clear recorded.
Bear Creek	Caution advisory, last posted Jun 28, 2021. No all-clear recorded.
Bel Marin Keys	Caution advisory, last posted Dec 17, 2020. No all-clear recorded.
Bell Canyon Reservoir	Caution advisory, last posted Aug 10, 2026. No all-clear recorded.
Ben Williams River Wildlife Refuge	Warning advisory, last posted Oct 21, 2022. No all-clear recorded.
Berkeley Aquatic Park	Caution advisory, last posted Oct 18, 2024. No all-clear recorded.
Bethel Island	Caution advisory, last posted Aug 3, 2023. No all-clear recorded.
Big Bear Lake	Danger advisory, last posted Aug 28, 2024. No all-clear recorded.
Big Bear Lake	Danger advisory, last posted Aug 28, 2026. No all-clear recorded.
Big bear lake ca	Caution advisory, last posted Aug 18, 2026. No all-clear recorded.
Big Break Regional Shoreline	Danger advisory, last posted Oct 9, 2026. No all-clear recorded.
Big Chico Creek	Caution advisory, last posted Jul 12, 2024. No all-clear recorded.
Big Lagoon	Warning advisory, last posted Oct 15, 2020. No all-clear recorded.
Big Meadow Creek	Caution advisory, last posted Jul 16, 2021. No all-clear recorded.
Big River	Algal mat general awareness sign, last posted Sep 15, 2021. No all-clear recorded.
Black Butte Reservoir	Caution advisory, last posted Jul 1, 2019. No all-clear recorded.
Black Butte Reservoir Borrow Ponds	Caution advisory, last posted Jun 17, 2019. No all-clear recorded.
Black Mountain Creek	Algal mat alert sign, last posted Aug 24, 2023. No all-clear recorded.
Boronda Lake	Caution advisory, last posted Aug 27, 2024. No all-clear recorded.
Bridgeport Reservoir	Danger advisory, last posted Oct 20, 2026. No all-clear recorded.
Briones Regional Park	Visual observation, last posted Jan 13, 2025. No all-clear recorded.
Brookside Lake	Visual observation, last posted Sep 13, 2024. No all-clear recorded.
Bucks Lake	Caution advisory, last posted Sep 3, 2025. No all-clear recorded.
Butte Creek	Caution advisory, last posted Jun 27, 2025. No all-clear recorded.
Cache Creek	Caution advisory, last posted Jul 11, 2024. No all-clear recorded.
Cache Creek	Danger advisory, last posted Sep 4, 2025. No all-clear recorded.
Calaveras River	Warning advisory, last posted Jul 14, 2021. No all-clear recorded.
California Park Lake	Danger advisory, last posted Apr 30, 2016. No all-clear recorded.
Camden Lake	Danger advisory, last posted Oct 18, 2022. No all-clear recorded.
Canoe Creek	Algal mat general awareness sign, last posted Sep 20, 2021. No all-clear recorded.
Canyon Creek	Caution advisory, last posted Jul 23, 2021. No all-clear recorded.
Canyon Lake	Caution advisory, last posted Sep 2, 2026. No all-clear recorded.
Carl Thornton Park	Visual observation, last posted Aug 8, 2025. No all-clear recorded.
Carquinez Strait	Danger advisory, last posted Jul 8, 2026. No all-clear recorded.
Carquinez Strait	Visual observation, last posted Aug 1, 2023. No all-clear recorded.
Carter Creek	Caution advisory, last posted Jul 1, 2021. No all-clear recorded.
Castaic Lake	Warning advisory, last posted Oct 19, 2026. No all-clear recorded.
Cat Creek	Algal mat alert sign, last posted Jun 4, 2024. No all-clear recorded.
Central Branch Kern Island Canal	Caution advisory, last posted Mar 4, 2026. No all-clear recorded.
Charity Valley Creek	Caution advisory, last posted Jul 16, 2021. No all-clear recorded.
Chrissy Field Marsh	Algal mat alert sign, last posted Aug 28, 2024. No all-clear recorded.
Clavey River	Caution advisory, last posted Oct 7, 2021. No all-clear recorded.
Clear Lake	Caution advisory, last posted Jul 3, 2026. No all-clear recorded.
Clear Lake	Danger advisory, last posted Sep 4, 2026. No all-clear recorded.
Cold Stream	Caution advisory, last posted Aug 7, 2026. No all-clear recorded.
Colorado River	Caution advisory, last posted Nov 28, 2022. No all-clear recorded.
Colorado River	Danger advisory, last posted Mar 30, 2026. No all-clear recorded.
Colorado River	Caution advisory, last posted Dec 7, 2022. No all-clear recorded.
Combie lake	Caution advisory, last posted Aug 5, 2026. No all-clear recorded.
Contra Loma Reservoir	Caution advisory, last posted Dec 8, 2022. No all-clear recorded.
Copco Reservoir	Danger advisory, last posted Nov 7, 2023. No all-clear recorded.
Copsey Creek	Danger advisory, last posted Jul 26, 2024. No all-clear recorded.
Corbin Creek	Caution advisory, last posted Aug 12, 2021. No all-clear recorded.
Corcoran Lagoon	Caution advisory, last posted Jun 19, 2024. No all-clear recorded.
Crab Creek	Algal mat alert sign, last posted Jun 19, 2026. No all-clear recorded.
Crabtree Creek	Algal mat alert sign, last posted Jun 4, 2026. No all-clear recorded.
Crowley Lake	Danger advisory, last posted Sep 30, 2026. No all-clear recorded.
Cucamonga-Guasti Regional Park	Caution advisory, last posted Aug 29, 2024. No all-clear recorded.
Cypress Ridge Golf Course	Caution advisory, last posted Nov 19, 2021. No all-clear recorded.
Deadman Creek	Caution advisory, last posted Sep 4, 2026. No all-clear recorded.
Delta Coves	Caution advisory, last posted Jul 27, 2026. No all-clear recorded.
Diamond valley lake	Danger advisory, last posted May 8, 2026. No all-clear recorded.
Diaz Lake	Caution advisory, last posted Aug 29, 2023. No all-clear recorded.
Discovery Bay	Danger advisory, last posted Jul 8, 2026. No all-clear recorded.
Discovery Bay Marina	Caution advisory, last posted Jul 24, 2026. No all-clear recorded.
Dodge Reservoir	Visual observation, last posted Jul 31, 2026. No all-clear recorded.
Donovan Reservoir	Visual observation, last posted Aug 2, 2023. No all-clear recorded.
Dorst Creek	Algal mat alert sign, last posted Jul 22, 2025. No all-clear recorded.
Duncan Creek	Caution advisory, last posted Jul 14, 2021. No all-clear recorded.
Eagle Lake	Caution advisory, last posted Oct 7, 2026. No all-clear recorded.
Eagle Lakes	Caution advisory, last posted Apr 26, 2021. No all-clear recorded.
East Creek	Caution advisory, last posted Aug 27, 2026. No all-clear recorded.
East Fork Kaweah River	Algal mat alert sign, last posted Aug 23, 2022. No all-clear recorded.
East Fork Russian River	Algal mat alert sign, last posted Sep 25, 2026. No all-clear recorded.
East Park Reservoir	Caution advisory, last posted Sep 1, 2021. No all-clear recorded.
East Walker River	Caution advisory, last posted Aug 29, 2025. No all-clear recorded.
Eel River	Caution advisory, last posted Sep 16, 2026. No all-clear recorded.
El Dorado East Regional Park	Caution advisory, last posted Aug 4, 2022. No all-clear recorded.
El Estero Lake	Caution advisory, last posted May 25, 2021. No all-clear recorded.
Elizabeth Lake	Visual observation, last posted Jun 2, 2025. No all-clear recorded.
Ellis Lake	Caution advisory, last posted Sep 24, 2026. No all-clear recorded.
Evan's Pond	Caution advisory, last posted Jul 25, 2019. No all-clear recorded.
Ewing Reservoir	Caution advisory, last posted Nov 12, 2025. No all-clear recorded.
Fall River Lake	Caution advisory, last posted Jul 13, 2026. No all-clear recorded.
False River	Visual observation, last posted Nov 6, 2023. No all-clear recorded.
Fisherman's Cut	Visual observation, last posted Nov 6, 2023. No all-clear recorded.
Fitzhugh Creek	Caution advisory, last posted Sep 29, 2021. No all-clear recorded.
Forbes Creek	Warning advisory, last posted Jul 22, 2024. No all-clear recorded.
Foster City Marina Lagoon	Caution advisory, last posted Jun 26, 2026. No all-clear recorded.
Four Island Lake	Caution advisory, last posted Aug 8, 2022. No all-clear recorded.
Frank's Tract	Caution advisory, last posted Jul 21, 2022. No all-clear recorded.
General Creek	Algal mat alert sign, last posted Sep 3, 2026. No all-clear recorded.
Glen Helen Regional Park	Caution advisory, last posted Sep 1, 2020. No all-clear recorded.
Granite Park	Caution advisory, last posted Oct 19, 2022. No all-clear recorded.
Grant Line Canal	Caution advisory, last posted Sep 17, 2026. No all-clear recorded.
Gray Eagle Creek	Algal mat alert sign, last posted Jul 23, 2026. No all-clear recorded.
Green Valley Lake	Caution advisory, last posted Jul 28, 2023. No all-clear recorded.
Greenhill Estates	Danger advisory, last posted Feb 2, 2022. No all-clear recorded.
Grizzly Creek	Caution advisory, last posted Oct 19, 2020. No all-clear recorded.
Guajome Lake	General awareness, last posted Mar 5, 2026. No all-clear recorded.
Gualala River	Caution advisory, last posted Jul 14, 2021. No all-clear recorded.
Gualala River	Algal mat general awareness sign, last posted Jul 27, 2022. No all-clear recorded.
Gunnerson Pond	Caution advisory, last posted Oct 11, 2022. No all-clear recorded.
H.V. Eastman Lake	Danger advisory, last posted Aug 25, 2026. No all-clear recorded.
Harveston Lake	Caution advisory, last posted Aug 31, 2026. No all-clear recorded.
Heavenly Valley Creek	Algal mat alert sign, last posted Sep 5, 2025. No all-clear recorded.
Heenan Reservoir	Caution advisory, last posted Oct 26, 2022. No all-clear recorded.
Hells Hollow Creek	Algal mat alert sign, last posted May 22, 2025. No all-clear recorded.
Hensley Lake	Caution advisory, last posted Aug 25, 2026. No all-clear recorded.
Heritage Park	Warning advisory, last posted Jul 12, 2024. No all-clear recorded.
High Valley Pond	Danger advisory, last posted Oct 29, 2021. No all-clear recorded.
Holland Cut	Visual observation, last posted Oct 26, 2023. No all-clear recorded.
Horseshoe Lake	Caution advisory, last posted Nov 6, 2025. No all-clear recorded.
Horseshoe Lake	Caution advisory, last posted Nov 6, 2017. No all-clear recorded.
Hot Springs Creek	General awareness, last posted Mar 28, 2024. No all-clear recorded.
Huichica Pond 8	Danger advisory, last posted Sep 2, 2022. No all-clear recorded.
Hume Lake	Caution advisory, last posted Jul 29, 2026. No all-clear recorded.
Hummingbird Lake	Caution advisory, last posted Sep 7, 2021. No all-clear recorded.
Imperial Wildlife Area Wister Unit	Caution advisory, last posted Jun 25, 2021. No all-clear recorded.
Imperial Wildlife Area Wister Unit	Caution advisory, last posted Dec 10, 2019. No all-clear recorded.
Indian Creek	Caution advisory, last posted Jul 30, 2026. No all-clear recorded.
Indian Creek Reservoir	Danger advisory, last posted Sep 2, 2026. No all-clear recorded.
Iron Gate Reservoir	Danger advisory, last posted Nov 7, 2023. No all-clear recorded.
Jamison Creek	Algal mat alert sign, last posted Jul 23, 2026. No all-clear recorded.
Jawbone Creek	Caution advisory, last posted Oct 7, 2021. No all-clear recorded.
John Anson Ford Park Lake	Visual observation, last posted Sep 28, 2026. No all-clear recorded.
Juaquapin Creek	Algal mat alert sign, last posted May 18, 2023. No all-clear recorded.
Kaweah Lake	Algal mat general awareness sign, last posted Oct 16, 2024. No all-clear recorded.
Kaweah River	Caution advisory, last posted Sep 14, 2026. No all-clear recorded.
Kelly Lake	Caution advisory, last posted Sep 29, 2026. No all-clear recorded.
Kelsey Creek	Caution advisory, last posted Jul 14, 2021. No all-clear recorded.
Kern River	Caution advisory, last posted Aug 31, 2026. No all-clear recorded.
Kern River	Caution advisory, last posted Jul 1, 2021. No all-clear recorded.
Kidder Creek	Algal mat alert sign, last posted Oct 13, 2026. No all-clear recorded.
Kit Carson Park Eagle Scout Lake	Caution advisory, last posted Aug 25, 2026. No all-clear recorded.
Klamath River	Warning advisory, last posted Sep 18, 2026. No all-clear recorded.
Klamath River	Danger advisory, last posted Nov 3, 2025. No all-clear recorded.
Klamath River	Danger advisory, last posted Nov 7, 2023. No all-clear recorded.
La Mirada Lake	Visual observation, last posted Sep 28, 2026. No all-clear recorded.
Lago Los Osos	Caution advisory, last posted Oct 9, 2026. No all-clear recorded.
Laguna Creek	Caution advisory, last posted Jul 28, 2020. No all-clear recorded.
Laguna Lake	Caution advisory, last posted Sep 4, 2026. No all-clear recorded.
Lagunita Mirada Park	Caution advisory, last posted May 25, 2021. No all-clear recorded.
Lake Almaden	Danger advisory, last posted Nov 8, 2024. No all-clear recorded.
Lake Almanor	Caution advisory, last posted Sep 10, 2026. No all-clear recorded.
Lake Anza	Danger advisory, last posted Jul 16, 2021. No all-clear recorded.
Lake Baron	Caution advisory, last posted Dec 13, 2021. No all-clear recorded.
Lake Berryessa	Caution advisory, last posted Aug 28, 2026. No all-clear recorded.
Lake Britton	Caution advisory, last posted Aug 21, 2026. No all-clear recorded.
Lake Chabot	Danger advisory, last posted Oct 16, 2026. No all-clear recorded.
Lake Chabot	Caution advisory, last posted Apr 3, 2020. No all-clear recorded.
Lake Clementine	Caution advisory, last posted Sep 24, 2024. No all-clear recorded.
Lake Crowley	Danger advisory, last posted Oct 19, 2022. No all-clear recorded.
Lake Cunningham	Danger advisory, last posted Oct 16, 2018. No all-clear recorded.
Lake Davis	Caution advisory, last posted Oct 10, 2025. No all-clear recorded.
Lake Del Valle	Danger advisory, last posted Oct 16, 2026. No all-clear recorded.
Lake Elsinore	Danger advisory, last posted Sep 24, 2026. No all-clear recorded.
Lake Estelle	Caution advisory, last posted Aug 21, 2024. No all-clear recorded.
Lake Evans	Caution advisory, last posted Aug 1, 2024. No all-clear recorded.
Lake Gregory	Caution advisory, last posted Aug 29, 2024. No all-clear recorded.
Lake Hacienda	Caution advisory, last posted Jul 17, 2026. No all-clear recorded.
Lake Havasu	Danger advisory, last posted Jun 29, 2026. No all-clear recorded.
Lake Havasu (Arizona)	Caution advisory, last posted Apr 16, 2026. No all-clear recorded.
Lake Hemet	Danger advisory, last posted Sep 2, 2026. No all-clear recorded.
Lake Hennessey	Caution advisory, last posted Apr 4, 2024. No all-clear recorded.
Lake Henshaw	Caution advisory, last posted Dec 28, 2022. No all-clear recorded.
Lake herman	Caution advisory, last posted Oct 7, 2024. No all-clear recorded.
Lake Hodges	Caution advisory, last posted May 24, 2019. No all-clear recorded.
Lake Hughes	Visual observation, last posted Jun 20, 2024. No all-clear recorded.
Lake Isabella	Danger advisory, last posted Jul 17, 2026. No all-clear recorded.
Lake Isabella	Visual observation, last posted Jul 17, 2024. No all-clear recorded.
Lake McSwain	Caution advisory, last posted Jun 12, 2026. No all-clear recorded.
Lake Mendocino	General awareness, last posted Jul 3, 2025. No all-clear recorded.
Lake Merced	Danger advisory, last posted Jun 27, 2024. No all-clear recorded.
Lake Merritt	Caution advisory, last posted Jun 5, 2025. No all-clear recorded.
Lake Mildred	Caution advisory, last posted Nov 17, 2020. No all-clear recorded.
Lake Ming	Caution advisory, last posted Jul 1, 2025. No all-clear recorded.
Lake Morena	Caution advisory, last posted Jul 1, 2021. No all-clear recorded.
Lake Nacimiento	General awareness, last posted Sep 4, 2026. No all-clear recorded.
Lake Natoma	General awareness, last posted Nov 18, 2022. No all-clear recorded.
Lake O'Neill	General awareness, last posted Jul 1, 2026. No all-clear recorded.
Lake of the Pines	Caution advisory, last posted Sep 22, 2026. No all-clear recorded.
Lake Oroville	Caution advisory, last posted Sep 14, 2026. No all-clear recorded.
Lake Perris	Danger advisory, last posted Feb 27, 2023. No all-clear recorded.
Lake Pillsbury	Danger advisory, last posted Oct 19, 2026. No all-clear recorded.
Lake Ralphine	Warning advisory, last posted Jul 20, 2026. No all-clear recorded.
Lake San Antonio	Danger advisory, last posted Sep 4, 2026. No all-clear recorded.
Lake San Marcos	Warning advisory, last posted Jul 14, 2023. No all-clear recorded.
Lake Shastina	Danger advisory, last posted May 14, 2025. No all-clear recorded.
Lake Tahoe	Caution advisory, last posted Oct 7, 2026. No all-clear recorded.
Lake Tahoe	Caution advisory, last posted Oct 7, 2026. No all-clear recorded.
Lake Temescal	Danger advisory, last posted Oct 16, 2026. No all-clear recorded.
Lake Tulloch	Caution advisory, last posted Aug 17, 2026. No all-clear recorded.
Lake Tulloch	Caution advisory, last posted Jul 31, 2026. No all-clear recorded.
Lake Tulloch	Caution advisory, last posted Aug 11, 2026. No all-clear recorded.
Lake Washington	Caution advisory, last posted Aug 16, 2024. No all-clear recorded.
Lake Zyac	Caution advisory, last posted Sep 15, 2026. No all-clear recorded.
Lakeshore Park	Visual observation, last posted Apr 29, 2024. No all-clear recorded.
Legg Lake	Caution advisory, last posted Aug 27, 2026. No all-clear recorded.
Leslie Creek	Caution advisory, last posted Nov 8, 2024. No all-clear recorded.
Lewiston Lake	Caution advisory, last posted Jul 7, 2021. No all-clear recorded.
Lily Lake	Caution advisory, last posted Oct 2, 2020. No all-clear recorded.
Lincoln Creek	Caution advisory, last posted Sep 30, 2021. No all-clear recorded.
Lindo Lake	Danger advisory, last posted Aug 28, 2024. No all-clear recorded.
Lindsey Slough	Caution advisory, last posted Aug 5, 2021. No all-clear recorded.
Little Last Chance Creek	Caution advisory, last posted Jul 1, 2021. No all-clear recorded.
Little Sur River	Algal mat alert sign, last posted Jul 8, 2026. No all-clear recorded.
Little Truckee River	Caution advisory, last posted Sep 8, 2023. No all-clear recorded.
Little Truckee River	Caution advisory, last posted Oct 9, 2024. No all-clear recorded.
Lodi Lake	Algal mat alert sign, last posted May 4, 2023. No all-clear recorded.
Long Lake	Caution advisory, last posted Sep 28, 2021. No all-clear recorded.
Lopez Lake	Caution advisory, last posted Sep 4, 2026. No all-clear recorded.
Los Padres Reservoir	Caution advisory, last posted Oct 8, 2025. No all-clear recorded.
Los Vaqueros Reservoir	Visual observation, last posted Jul 6, 2023. No all-clear recorded.
Lost Lake	Visual observation, last posted Jul 15, 2025. No all-clear recorded.
Lost Man Creek	Caution advisory, last posted Aug 27, 2021. No all-clear recorded.
Lower Klamath National Wildlife Refuge	Caution advisory, last posted Sep 23, 2025. No all-clear recorded.
Lower Otay Reservoir	Warning advisory, last posted Jul 11, 2025. No all-clear recorded.
Machado Lake	Caution advisory, last posted Aug 26, 2024. No all-clear recorded.
Mad River	Danger advisory, last posted Sep 15, 2026. No all-clear recorded.
Mad River	Caution advisory, last posted Apr 26, 2021. No all-clear recorded.
Malibu Creek	Caution advisory, last posted May 24, 2017. No all-clear recorded.
Malibu Lake	Caution advisory, last posted Aug 31, 2020. No all-clear recorded.
Manning Creek	Caution advisory, last posted Jul 1, 2022. No all-clear recorded.
Marble Fork Kaweah River	Algal mat alert sign, last posted Aug 1, 2022. No all-clear recorded.
Marin Civic Center Lagoon	Visual observation, last posted Jun 5, 2025. No all-clear recorded.
Martinez Shoreline	Caution advisory, last posted Oct 16, 2026. No all-clear recorded.
Mather Lake	Caution advisory, last posted Aug 25, 2025. No all-clear recorded.
Mather Regional Park	Caution advisory, last posted Sep 16, 2025. No all-clear recorded.
McKinley Park	Warning advisory, last posted Jun 4, 2025. No all-clear recorded.
McLeod Lake	Danger advisory, last posted Jul 9, 2021. No all-clear recorded.
Meadow Creek	Caution advisory, last posted Oct 14, 2020. No all-clear recorded.
Merced River	Caution advisory, last posted Nov 4, 2022. No all-clear recorded.
Middle Fork American River	Algal mat alert sign, last posted Sep 11, 2025. No all-clear recorded.
Middle Fork Feather River	Algal mat alert sign, last posted Aug 27, 2026. No all-clear recorded.
Middle Fork San Joaquin River	Algal mat alert sign, last posted Sep 27, 2022. No all-clear recorded.
Middle River	Caution advisory, last posted Jul 24, 2026. No all-clear recorded.
Mill Creek	Algal mat alert sign, last posted Aug 27, 2026. No all-clear recorded.
Mill Creek	General awareness, last posted Jul 1, 2026. No all-clear recorded.
Millpond	Caution advisory, last posted Sep 2, 2016. No all-clear recorded.
Miramar Reservoir	Caution advisory, last posted Oct 2, 2026. No all-clear recorded.
Mokelumne River	Visual observation, last posted Nov 6, 2023. No all-clear recorded.
Monterey Bay	Caution advisory, last posted Oct 28, 2022. No all-clear recorded.
Morena Reservoir	Caution advisory, last posted Sep 21, 2026. No all-clear recorded.
Mormon Slough	Danger advisory, last posted Aug 25, 2020. No all-clear recorded.
Mountain Meadows Reservoir	Caution advisory, last posted Aug 11, 2026. No all-clear recorded.
Muskgrave Creek	Algal mat alert sign, last posted May 14, 2026. No all-clear recorded.
Mystic Lake	Danger advisory, last posted Sep 9, 2024. No all-clear recorded.
Nacimiento River	Algal mat alert sign, last posted Jul 3, 2026. No all-clear recorded.
Napa HCU Pond	Caution advisory, last posted Sep 3, 2020. No all-clear recorded.
Napa-Sonoma Marshes Wildlife Area	Danger advisory, last posted Oct 8, 2025. No all-clear recorded.
Natomas Park	Caution advisory, last posted Jun 22, 2021. No all-clear recorded.
Navarro River	Danger advisory, last posted Aug 27, 2026. No all-clear recorded.
New Bullards Bar Reservoir	Caution advisory, last posted Jul 26, 2024. No all-clear recorded.
New Melones Reservoir	Caution advisory, last posted Aug 10, 2021. No all-clear recorded.
New River	Danger advisory, last posted Oct 11, 2024. No all-clear recorded.
New River	Caution advisory, last posted Sep 1, 2021. No all-clear recorded.
Nicasio Reservoir	Caution advisory, last posted May 19, 2021. No all-clear recorded.
Nobe Young Creek	Caution advisory, last posted Sep 1, 2023. No all-clear recorded.
North Crane Creek	Algal mat alert sign, last posted Aug 29, 2025. No all-clear recorded.
North Fork American River	Caution advisory, last posted Oct 23, 2024. No all-clear recorded.
North Fork Kaweah River	Algal mat alert sign, last posted Aug 9, 2024. No all-clear recorded.
North Fork San Jacinto Creek	Algal mat alert sign, last posted May 10, 2024. No all-clear recorded.
North Legg Lake	Caution advisory, last posted Sep 29, 2020. No all-clear recorded.
North Natomas Regional Park	Caution advisory, last posted Jun 30, 2021. No all-clear recorded.
North Table Mountain Ecological Reserve	Algal mat alert sign, last posted Sep 28, 2026. No all-clear recorded.
North Yuba River	Caution advisory, last posted Sep 17, 2026. No all-clear recorded.
Novato Creek	Caution advisory, last posted Apr 26, 2024. No all-clear recorded.
O'Neill Forebay	Caution advisory, last posted Dec 19, 2022. No all-clear recorded.
Oak St. Ponds (unnamed)	Caution advisory, last posted May 27, 2026. No all-clear recorded.
Oakland Estuary	Caution advisory, last posted Aug 8, 2022. No all-clear recorded.
Oakwood Lake	Caution advisory, last posted Jun 30, 2021. No all-clear recorded.
Odell Lake	Caution advisory, last posted Sep 7, 2021. No all-clear recorded.
Old River	Caution advisory, last posted Sep 17, 2026. No all-clear recorded.
Old River	Caution advisory, last posted Sep 17, 2026. No all-clear recorded.
Oregon Creek	Caution advisory, last posted Jul 1, 2021. No all-clear recorded.
Oso Flaco Creek	Caution advisory, last posted Sep 4, 2026. No all-clear recorded.
Oso Flaco Lake	Caution advisory, last posted Sep 4, 2026. No all-clear recorded.
Owl Creek	Algal mat alert sign, last posted Aug 27, 2026. No all-clear recorded.
Pacific Ocean	Caution advisory, last posted Mar 9, 2026. No all-clear recorded.
Pacific Ocean	Visual observation, last posted Oct 23, 2024. No all-clear recorded.
Pacific Ocean	General awareness, last posted Apr 7, 2025. No all-clear recorded.
Pacific Ocean	Caution advisory, last posted Oct 30, 2024. No all-clear recorded.
Pass Creek	Caution advisory, last posted Jul 14, 2021. No all-clear recorded.
Peace Pond	Caution advisory, last posted Jul 7, 2025. No all-clear recorded.
Peacock Gap HOA Golf Course	Warning advisory, last posted Aug 1, 2018. No all-clear recorded.
Pentachaeta Creek	Caution advisory, last posted Mar 19, 2021. No all-clear recorded.
Phantom Falls creek	Algal mat alert sign, last posted May 11, 2023. No all-clear recorded.
Pine Mountain Lake	Caution advisory, last posted Aug 21, 2025. No all-clear recorded.
Pinto Lake	Warning advisory, last posted Oct 16, 2026. No all-clear recorded.
Pleasant Grove Creek South Fork	Algal mat alert sign, last posted May 8, 2024. No all-clear recorded.
Pleasant Valley Reservoir	Danger advisory, last posted Aug 21, 2026. No all-clear recorded.
Plum Creek	Caution advisory, last posted Aug 27, 2021. No all-clear recorded.
Pocket Canal	Caution advisory, last posted Jun 24, 2026. No all-clear recorded.
Pond #1 on Klamath River Overflow Channel	Caution advisory, last posted Oct 7, 2024. No all-clear recorded.
Potato Creek	Caution advisory, last posted Oct 1, 2021. No all-clear recorded.
Potrero Creek	Visual observation, last posted Apr 13, 2026. No all-clear recorded.
Prado Regional Park	Danger advisory, last posted Sep 4, 2026. No all-clear recorded.
Private pond	Caution advisory, last posted Mar 11, 2026. No all-clear recorded.
Prosser Creek	Caution advisory, last posted Oct 14, 2021. No all-clear recorded.
Prosser reservoir	Visual observation, last posted Sep 3, 2026. No all-clear recorded.
Puddingstone Reservoir	Caution advisory, last posted May 14, 2026. No all-clear recorded.
Putah Creek	Caution advisory, last posted Aug 21, 2026. No all-clear recorded.
Putah Creek	Caution advisory, last posted Nov 10, 2020. No all-clear recorded.
Pyramid Lake	Warning advisory, last posted Oct 14, 2026. No all-clear recorded.
Quarry Lakes	Danger advisory, last posted Oct 16, 2026. No all-clear recorded.
Quarry Pond	Visual observation, last posted Aug 29, 2025. No all-clear recorded.
Rae Lakes	Algal mat alert sign, last posted Sep 26, 2022. No all-clear recorded.
Red Lake	Warning advisory, last posted Oct 16, 2026. No all-clear recorded.
Red Lake Creek	Algal mat alert sign, last posted Sep 5, 2025. No all-clear recorded.
Redwood Creek	Caution advisory, last posted Aug 29, 2022. No all-clear recorded.
Reflection Lake	Caution advisory, last posted Jul 11, 2024. No all-clear recorded.
Rice Creek	Algal mat alert sign, last posted Sep 9, 2026. No all-clear recorded.
Richardson Bay	Caution advisory, last posted Jul 31, 2023. No all-clear recorded.
Rim Rock Lake	Caution advisory, last posted Aug 9, 2018. No all-clear recorded.
Ringstrom Unit Marsh	Caution advisory, last posted Jun 25, 2026. No all-clear recorded.
River Birch Park	Caution advisory, last posted Jun 30, 2021. No all-clear recorded.
Roberts Lake	Caution advisory, last posted May 25, 2021. No all-clear recorded.
Rock Creek	Caution advisory, last posted Jul 1, 2021. No all-clear recorded.
Rock Creek	Algal mat alert sign, last posted May 22, 2025. No all-clear recorded.
Round Valley Reservoir	General awareness, last posted Nov 22, 2023. No all-clear recorded.
Ruby Lake	Caution advisory, last posted Sep 22, 2021. No all-clear recorded.
Rush Creek Marsh Wildlife Area	Caution advisory, last posted May 12, 2026. No all-clear recorded.
Russian River	Algal mat alert sign, last posted Oct 19, 2026. No all-clear recorded.
Ruth Lake	Caution advisory, last posted May 27, 2021. No all-clear recorded.
Sacramento River	Caution advisory, last posted Oct 5, 2020. No all-clear recorded.
Sacramento River	Caution advisory, last posted Aug 6, 2021. No all-clear recorded.
Sacramento River	Caution advisory, last posted Sep 7, 2021. No all-clear recorded.
Sagehen Creek	Algal mat alert sign, last posted Aug 7, 2026. No all-clear recorded.
Salmon Creek	Caution advisory, last posted Sep 1, 2021. No all-clear recorded.
Salmon Creek	Algal mat alert sign, last posted Aug 27, 2026. No all-clear recorded.
Salmon Creek	Caution advisory, last posted Jul 1, 2021. No all-clear recorded.
Salmon Creek Lagoon	Caution advisory, last posted Jun 30, 2020. No all-clear recorded.
Salmon River	Algal mat alert sign, last posted Oct 9, 2026. No all-clear recorded.
salt spring valley reservoir	Caution advisory, last posted Dec 10, 2019. No all-clear recorded.
Salton Sea	Warning advisory, last posted Jul 16, 2021. No all-clear recorded.
Salton Sea	Caution advisory, last posted Sep 8, 2026. No all-clear recorded.
Salton Sea	Caution advisory, last posted May 17, 2024. No all-clear recorded.
San Antonio Lake	Caution advisory, last posted Aug 26, 2024. No all-clear recorded.
San Antonio River	Algal mat alert sign, last posted Jul 3, 2026. No all-clear recorded.
San Clemente Creek	Algal mat alert sign, last posted Jun 9, 2023. No all-clear recorded.
San Diego Creek	Caution advisory, last posted Jul 20, 2022. No all-clear recorded.
San Diego River	Warning advisory, last posted Aug 25, 2023. No all-clear recorded.
San Dieguito River	Algal mat alert sign, last posted Aug 25, 2023. No all-clear recorded.
San Francisco Bay	General awareness, last posted Jul 28, 2025. No all-clear recorded.
San Francisco Bay, Central	Visual observation, last posted Aug 1, 2023. No all-clear recorded.
San Francisco Bay, Central	Caution advisory, last posted Aug 1, 2023. No all-clear recorded.
San Francisco Bay, Central	Visual observation, last posted Aug 1, 2023. No all-clear recorded.
San Francisco Bay, Central	Caution advisory, last posted Aug 25, 2023. No all-clear recorded.
San Francisco Bay, Lower	Visual observation, last posted Aug 16, 2024. No all-clear recorded.
San Francisco Bay, Lower	Caution advisory, last posted Aug 25, 2022. No all-clear recorded.
San Jacinto Wildlife Area	Caution advisory, last posted Oct 29, 2020. No all-clear recorded.
San Joaquin River	Danger advisory, last posted Aug 3, 2022. No all-clear recorded.
San Joaquin River	Algal mat alert sign, last posted Aug 29, 2025. No all-clear recorded.
San Joaquin River	Caution advisory, last posted Sep 10, 2021. No all-clear recorded.
San Joaquin River	Danger advisory, last posted Aug 5, 2022. No all-clear recorded.
San Joaquin River	Danger advisory, last posted Sep 8, 2022. No all-clear recorded.
San Juan Creek	Algal mat alert sign, last posted Sep 1, 2026. No all-clear recorded.
San Luis Reservoir	Danger advisory, last posted Oct 19, 2026. No all-clear recorded.
San Mateo Canyon Creek	Algal mat alert sign, last posted May 19, 2025. No all-clear recorded.
San Mateo Marina Lagoon	Caution advisory, last posted Jun 26, 2026. No all-clear recorded.
San Pablo Bay	Visual observation, last posted Aug 1, 2023. No all-clear recorded.
San Pablo Bay	Caution advisory, last posted Sep 7, 2022. No all-clear recorded.
San Ramon Creek	Caution advisory, last posted Oct 18, 2024. No all-clear recorded.
Santa Ana River	Caution advisory, last posted Jul 14, 2022. No all-clear recorded.
Santa Ana River	Algal mat general awareness sign, last posted Sep 25, 2026. No all-clear recorded.
Santa Fe Reservoir	Caution advisory, last posted May 11, 2022. No all-clear recorded.
Santa Margarita Lake	Caution advisory, last posted Dec 9, 2022. No all-clear recorded.
Santa Margarita River	General awareness, last posted Oct 19, 2022. No all-clear recorded.
Santee Lakes	Warning advisory, last posted Dec 18, 2025. No all-clear recorded.
Santee Lakes #5	Warning advisory, last posted Sep 17, 2025. No all-clear recorded.
Sardine Creek	Caution advisory, last posted Sep 13, 2021. No all-clear recorded.
Scott River	Caution advisory, last posted Oct 13, 2026. No all-clear recorded.
Scottsdale Pond	Warning advisory, last posted Jul 8, 2025. No all-clear recorded.
Seal Slough	Caution advisory, last posted Jul 1, 2021. No all-clear recorded.
Seiad Creek	Caution advisory, last posted Jul 30, 2021. No all-clear recorded.
Seiger Canyon Creek	Caution advisory, last posted Jul 1, 2022. No all-clear recorded.
Seven Mile Slough	Caution advisory, last posted Sep 1, 2021. No all-clear recorded.
Shadow Cliffs Arroyo	Caution advisory, last posted Dec 31, 2020. No all-clear recorded.
Shadow Cliffs Lake	Caution advisory, last posted Oct 16, 2026. No all-clear recorded.
Shag Slough	Caution advisory, last posted Aug 6, 2021. No all-clear recorded.
Shasta Lake	Caution advisory, last posted Sep 9, 2016. No all-clear recorded.
Sheffield Park	Algal mat alert sign, last posted May 11, 2023. No all-clear recorded.
Sherman Lake	Caution advisory, last posted Sep 2, 2022. No all-clear recorded.
Silver Fork American River	Caution advisory, last posted Nov 1, 2021. No all-clear recorded.
Silverwood Lake	Caution advisory, last posted Oct 19, 2026. No all-clear recorded.
Skinner Creek	Algal mat alert sign, last posted Jul 8, 2026. No all-clear recorded.
Slate Creek	Caution advisory, last posted Aug 12, 2021. No all-clear recorded.
Smith Canal	Caution advisory, last posted Jul 21, 2022. No all-clear recorded.
Smith Creek	Algal mat general awareness sign, last posted Jun 4, 2025. No all-clear recorded.
Sonoma Creek	Algal mat alert sign, last posted Aug 18, 2026. No all-clear recorded.
South Creek	Caution advisory, last posted Jul 1, 2021. No all-clear recorded.
South Fork Eel River	Caution advisory, last posted Oct 9, 2026. No all-clear recorded.
South Fork Eel River	Caution advisory, last posted Oct 9, 2026. No all-clear recorded.
South Fork Kaweah River	Algal mat alert sign, last posted Aug 23, 2022. No all-clear recorded.
South Fork Kings River	Algal mat alert sign, last posted Aug 23, 2022. No all-clear recorded.
South Fork Merced River	Algal mat general awareness sign, last posted Nov 4, 2022. No all-clear recorded.
South Fork Trinity River	Algal mat alert sign, last posted Jul 15, 2021. No all-clear recorded.
South Yuba River	Caution advisory, last posted Sep 9, 2026. No all-clear recorded.
South Yuba River	Caution advisory, last posted Sep 9, 2026. No all-clear recorded.
Southside park	Caution advisory, last posted Oct 19, 2022. No all-clear recorded.
Spreckels Lake	Caution advisory, last posted Nov 14, 2024. No all-clear recorded.
Spring Lake	Visual observation, last posted May 29, 2026. No all-clear recorded.
St. Helena Creek	Algal mat alert sign, last posted Jul 12, 2022. No all-clear recorded.
Stafford Lake	Warning advisory, last posted Oct 9, 2026. No all-clear recorded.
Stanton Creek	Algal mat alert sign, last posted Jun 16, 2022. No all-clear recorded.
Star Lake	Caution advisory, last posted Aug 31, 2020. No all-clear recorded.
Stockhoff Creek	Algal mat general awareness sign, last posted Jul 18, 2024. No all-clear recorded.
Stone Creek	Algal mat alert sign, last posted Jun 19, 2026. No all-clear recorded.
Stone Lagoon	Danger advisory, last posted Oct 19, 2020. No all-clear recorded.
Stonegate Lake	Caution advisory, last posted Oct 28, 2022. No all-clear recorded.
Tahoe Keys Lagoon	Warning advisory, last posted Aug 21, 2026. No all-clear recorded.
Tanzanite Park	Warning advisory, last posted Jun 17, 2022. No all-clear recorded.
Taylor Creek	Algal mat general awareness sign, last posted Jul 30, 2025. No all-clear recorded.
Temecula Creek	Algal mat alert sign, last posted Oct 16, 2023. No all-clear recorded.
Tenaya Creek	Caution advisory, last posted Sep 17, 2021. No all-clear recorded.
Three Mile Slough	Visual observation, last posted Nov 6, 2023. No all-clear recorded.
Tinemaha Reservoir	Visual observation, last posted Sep 3, 2025. No all-clear recorded.
Tomales Bay	Caution advisory, last posted Oct 31, 2024. No all-clear recorded.
Tributary to Pass Creek	Algal mat alert sign, last posted Jun 4, 2026. No all-clear recorded.
Tributary to Salmon Creek	Algal mat alert sign, last posted Jun 11, 2025. No all-clear recorded.
Trinity River	Caution advisory, last posted Oct 19, 2026. No all-clear recorded.
Trinity River	Caution advisory, last posted Aug 9, 2021. No all-clear recorded.
Trout Creek	Caution advisory, last posted Jul 31, 2026. No all-clear recorded.
Tule Lake	Caution advisory, last posted Jul 28, 2025. No all-clear recorded.
Tule Lake Wildlife Refuge	Danger advisory, last posted Sep 24, 2026. No all-clear recorded.
Tulloch	Caution advisory, last posted Aug 5, 2026. No all-clear recorded.
Tuolumne River	Caution advisory, last posted Sep 10, 2021. No all-clear recorded.
Tuolumne River	Caution advisory, last posted Aug 21, 2026. No all-clear recorded.
Turner Creek	Algal mat alert sign, last posted Jul 30, 2024. No all-clear recorded.
Turner Cut	Visual observation, last posted Sep 13, 2023. No all-clear recorded.
Twelvemile Creek	Algal mat alert sign, last posted Aug 27, 2026. No all-clear recorded.
Unnamed canal	Caution advisory, last posted Jul 9, 2021. No all-clear recorded.
Unnamed Canals	Caution advisory, last posted Nov 20, 2024. No all-clear recorded.
Unnamed Creek	Algal mat general awareness sign, last posted Sep 8, 2021. No all-clear recorded.
Unnamed creek	Algal mat alert sign, last posted May 29, 2025. No all-clear recorded.
Unnamed creek	Algal mat alert sign, last posted Jun 5, 2025. No all-clear recorded.
Unnamed creek	Algal mat alert sign, last posted May 22, 2025. No all-clear recorded.
Unnamed Ditch	Warning advisory, last posted May 9, 2018. No all-clear recorded.
Unnamed pond	Caution advisory, last posted Jul 21, 2025. No all-clear recorded.
Unnamed pond	Caution advisory, last posted Aug 28, 2024. No all-clear recorded.
Unnamed pond	Algal mat general awareness sign, last posted May 21, 2025. No all-clear recorded.
Unnamed ponds	Caution advisory, last posted Mar 20, 2017. No all-clear recorded.
Upper Blue Lake	Caution advisory, last posted Dec 18, 2019. No all-clear recorded.
Upper Lake	Caution advisory, last posted Aug 29, 2025. No all-clear recorded.
Upper Truckee River	Caution advisory, last posted Aug 7, 2026. No all-clear recorded.
Vail Lake	Caution advisory, last posted Jun 24, 2024. No all-clear recorded.
Van Duzen River	Caution advisory, last posted Sep 16, 2026. No all-clear recorded.
Venice Canals	Warning advisory, last posted Aug 8, 2025. No all-clear recorded.
Victoria Canal	Caution advisory, last posted Sep 17, 2026. No all-clear recorded.
Viejas Creek Spring Pond	Caution advisory, last posted Mar 27, 2023. No all-clear recorded.
Virginia Creek	Caution advisory, last posted Sep 13, 2021. No all-clear recorded.
Walker Creek	Caution advisory, last posted Jul 30, 2021. No all-clear recorded.
Weist Lake	Caution advisory, last posted Aug 27, 2026. No all-clear recorded.
West Canal	Visual observation, last posted Sep 17, 2026. No all-clear recorded.
West Street Basin	Caution advisory, last posted Nov 26, 2025. No all-clear recorded.
West Valley Reservoir	Caution advisory, last posted Jul 31, 2026. No all-clear recorded.
West Walker River	Caution advisory, last posted Aug 21, 2025. No all-clear recorded.
Whelan Lake	Danger advisory, last posted Aug 25, 2026. No all-clear recorded.
Whiskey Slough	Danger advisory, last posted Jul 14, 2021. No all-clear recorded.
White River	Algal mat alert sign, last posted Jul 23, 2026. No all-clear recorded.
White Slough	Caution advisory, last posted Jul 21, 2021. No all-clear recorded.
Wiest Lake	Caution advisory, last posted Nov 18, 2025. No all-clear recorded.
Wildcat Creek	Caution advisory, last posted Jul 10, 2025. No all-clear recorded.
William Land Park	Visual observation, last posted Aug 23, 2024. No all-clear recorded.
Willow Creek Ranch Estates Community	Caution advisory, last posted Sep 4, 2019. No all-clear recorded.
Willow Lake	Caution advisory, last posted Sep 3, 2020. No all-clear recorded.
Windy Hill Open Space Preserve	Caution advisory, last posted Sep 9, 2024. No all-clear recorded.
Yellow Creek	Caution advisory, last posted Sep 20, 2021. No all-clear recorded.
Yucaipa Regional Park	Caution advisory, last posted May 14, 2026. No all-clear recorded.
Yuciapa Regional Park	Caution advisory, last posted Oct 9, 2020. No all-clear recorded.
Zaca Lake	Caution advisory, last posted May 25, 2017. No all-clear recorded.
Adobe Creek	The state's latest record, from Oct 3, 2023, recommends no advisory.
Agua Caliente Creek	The state's latest record, from Jul 25, 2023, recommends no advisory.
Agua Hedionda Lagoon	The state's latest record, from Sep 18, 2020, recommends no advisory.
Alamo Pintado Creek	Reports on file, with no advisory level the state has classified.
All Seasons RV Park	The state's latest record, from Sep 17, 2025, recommends no advisory.
Anthony’s fish grotto	The state's latest record, from Jul 30, 2026, recommends no advisory.
Antioch/Oakley Regional Shoreline	The state's latest record, from Dec 4, 2018, recommends no advisory.
Applegate River	The state's latest record, from Jul 30, 2026, recommends no advisory.
Arcade Lake	The state's latest record, from Dec 4, 2018, recommends no advisory.
Arroyo Hondo Creek	The state's latest record, from Jun 11, 2026, recommends no advisory.
Arroyo Hondo Creek	The state's latest record, from Jul 16, 2026, recommends no advisory.
Arroyo San Jose	The state's latest record, from May 1, 2025, recommends no advisory.
Arroyo Seco	Reports on file, with no advisory level the state has classified.
Arroyo Valle	The state's latest record, from Mar 9, 2018, recommends no advisory.
Ash Slough Bypass Canal	The state's latest record, from Mar 2, 2022, recommends no advisory.
Austin Creek	The state's latest record, from Jun 6, 2022, recommends no advisory.
Barker Slough	The state's latest record, from Jul 12, 2017, recommends no advisory.
Barney Lake	The state's latest record, from Sep 13, 2022, recommends no advisory.
Barrett Reservoir	The state's latest record, from May 27, 2020, recommends no advisory.
Barton Creek	The state's latest record, from Jun 19, 2026, recommends no advisory.
Beans Gulch	The state's latest record, from Jun 24, 2022, recommends no advisory.
Bear Creek	The state's latest record, from May 3, 2024, recommends no advisory.
Bear Creek	The state's latest record, from Jun 11, 2024, recommends no advisory.
Beartrap Creek	The state's latest record, from Aug 6, 2026, recommends no advisory.
Beasore Creek	The state's latest record, from Jul 1, 2021, recommends no advisory.
Bethany Reservoir	The state's latest record, from Sep 26, 2024, recommends no advisory.
Big Break Regional Shoreline	The state's latest record, from Dec 8, 2022, recommends no advisory.
Big Laguna Lake	The state's latest record, from Aug 25, 2022, recommends no advisory.
Big Lake	The state's latest record, from Dec 10, 2019, recommends no advisory.
Big Silver Creek	The state's latest record, from Aug 18, 2025, recommends no advisory.
Bill Williams River	The state's latest record, from Dec 7, 2022, recommends no advisory.
Biscar Reservior	The state's latest record, from Aug 28, 2026, recommends no advisory.
Blue Creek	Reports on file, with no advisory level the state has classified.
Blue Lakes	The state recorded an end date of Jul 27, 2022.
Blue Slides Creek	The state's latest record, from Jun 26, 2025, recommends no advisory.
Boca Reservoir	The state's latest record, from Oct 7, 2026, recommends no advisory.
Bolsa Chico Ecological Reserve	Reports on file, with no advisory level the state has classified.
Borax Lake	The state's latest record, from May 9, 2018, recommends no advisory.
Boulder Creek	The state's latest record, from Aug 29, 2025, recommends no advisory.
Boulder Creek	The state's latest record, from Aug 25, 2023, recommends no advisory.
Brentwood Golf Course	The state's latest record, from Oct 24, 2018, recommends no advisory.
Bryant Creek	The state's latest record, from Oct 11, 2023, recommends no advisory.
Buckley Cove	The state's latest record, from Oct 1, 2026, recommends no advisory.
Burney Valley Creek	The state's latest record, from Sep 2, 2025, recommends no advisory.
Butano Creek	The state's latest record, from May 29, 2024, recommends no advisory.
Butcher Gulch	The state's latest record, from May 14, 2026, recommends no advisory.
Butte Creek	The state's latest record, from Jun 11, 2026, recommends no advisory.
Cahto Creek	The state's latest record, from Nov 26, 2024, recommends no advisory.
Calf Creek	The state's latest record, from May 29, 2026, recommends no advisory.
California Aqueduct	Reports on file, with no advisory level the state has classified.
Carmel River	The state's latest record, from Jul 8, 2026, recommends no advisory.
Cascade Creek	The state's latest record, from Aug 4, 2022, recommends no advisory.
Castaic Lagoon	The state's latest record, from Sep 17, 2026, recommends no advisory.
Cedar Creek	The state's latest record, from Jul 23, 2026, recommends no advisory.
Cedar Creek	The state's latest record, from May 19, 2025, recommends no advisory.
Cedar Creek Falls	The state's latest record, from May 11, 2026, recommends no advisory.
Central Lake	The state's latest record, from Aug 30, 2022, recommends no advisory.
Chalone Creek	The state's latest record, from Apr 9, 2026, recommends no advisory.
Cheenitch Creek	The state's latest record, from Jun 3, 2022, recommends no advisory.
Chelly Gulch	The state's latest record, from May 14, 2026, recommends no advisory.
Cherry Creek	The state's latest record, from Jul 7, 2022, recommends no advisory.
Chollas Creek	The state's latest record, from Oct 13, 2026, recommends no advisory.
Chollas Lake	The state's latest record, from Dec 13, 2022, recommends no advisory.
Chowchilla River	The state's latest record, from Jan 1, 2023, recommends no advisory.
City Creek	The state's latest record, from Jun 19, 2026, recommends no advisory.
Civic Center Park	The state recorded an end date of Jul 1, 2026.
Clear Creek	The state's latest record, from Jun 30, 2021, recommends no advisory.
Clear Creek	The state's latest record, from Jun 30, 2021, recommends no advisory.
Clifton Court Forebay	The state's latest record, from Oct 19, 2026, recommends no advisory.
Cold Stream	The state's latest record, from Sep 13, 2022, recommends no advisory.
Cold Stream	The state's latest record, from May 18, 2023, recommends no advisory.
Cold Stream Canyon	The state's latest record, from May 10, 2024, recommends no advisory.
Cole Creek	The state's latest record, from May 10, 2024, recommends no advisory.
College Lake	The state recorded an end date of Jun 12, 2025.
Combie Lake	The state's latest record, from Mar 12, 2021, recommends no advisory.
Concow Creek	The state's latest record, from Jul 1, 2021, recommends no advisory.
Corrine Lake	Reports on file, with no advisory level the state has classified.
Crystal Lake	The state's latest record, from Jun 30, 2021, recommends no advisory.
Cuyamaca Reservoir	The state's latest record, from Jun 1, 2022, recommends no advisory.
Davis Creek	The state's latest record, from Jun 19, 2025, recommends no advisory.
Deep Creek	The state's latest record, from Jun 27, 2024, recommends no advisory.
Devil's Canyon	The state's latest record, from Jun 26, 2026, recommends no advisory.
Devils Canyon Creek	The state's latest record, from May 19, 2025, recommends no advisory.
Dillon Creek	The state's latest record, from Nov 4, 2021, recommends no advisory.
Discovery Bay Golf and Country Club	Reports on file, with no advisory level the state has classified.
Doane Creek	The state's latest record, from Jul 25, 2023, recommends no advisory.
Dollar Creek Reservior	The state's latest record, from Aug 13, 2024, recommends no advisory.
Donner Lake	The state's latest record, from Sep 30, 2022, recommends no advisory.
Drew Lake	The state's latest record, from May 15, 2026, recommends no advisory.
Dry Creek	The state's latest record, from Jun 30, 2021, recommends no advisory.
Dry Gulch	The state's latest record, from May 21, 2025, recommends no advisory.
Dry Meadow Creek	The state's latest record, from Jul 25, 2024, recommends no advisory.
Dyer Reservoir	The state's latest record, from Oct 19, 2026, recommends no advisory.
Earvin Magic Johnson Lake	The state's latest record, from Aug 31, 2026, recommends no advisory.
Earvin Magic Johnson Park Lake	The state's latest record, from May 19, 2026, recommends no advisory.
Eel River	The state's latest record, from Aug 13, 2026, recommends no advisory.
El Dorado Park West	The state's latest record, from Jun 30, 2025, recommends no advisory.
Elbow Creek	The state's latest record, from Jun 26, 2025, recommends no advisory.
Elk Creek	The state's latest record, from Jul 30, 2026, recommends no advisory.
Elk Grove Regional Park	The state's latest record, from Aug 19, 2025, recommends no advisory.
Elk Grove Regional Park Lake	The state's latest record, from Jun 18, 2026, recommends no advisory.
Emerson Creek	The state's latest record, from Aug 27, 2026, recommends no advisory.
Englebright Lake	The state's latest record, from Aug 22, 2019, recommends no advisory.
Escondido Creek	The state's latest record, from Aug 25, 2022, recommends no advisory.
Espinosa Creek	The state's latest record, from Jul 25, 2023, recommends no advisory.
False River	The state's latest record, from Dec 4, 2018, recommends no advisory.
Famosa Slough	The state's latest record, from Oct 13, 2026, recommends no advisory.
Feather River	The state's latest record, from Sep 17, 2026, recommends no advisory.
Fenton Pond	The state's latest record, from Sep 9, 2024, recommends no advisory.
Fish Creek	The state's latest record, from Jun 11, 2026, recommends no advisory.
Fish Creek	The state's latest record, from Mar 27, 2026, recommends no advisory.
Fiske Creek	The state's latest record, from May 20, 2026, recommends no advisory.
Flora Lake	The state recorded an end date of Nov 10, 2022.
Florentine Arm Jamison Creek	The state's latest record, from Jul 8, 2022, recommends no advisory.
Flyaway Gulch	The state's latest record, from May 17, 2022, recommends no advisory.
Folsom Lake	Reports on file, with no advisory level the state has classified.
Folsom Lake	The state's latest record, from Jul 7, 2026, recommends no advisory.
Forest Meadows Golf Course	The state's latest record, from Oct 9, 2019, recommends no advisory.
Forestdale Creek	The state's latest record, from Oct 11, 2023, recommends no advisory.
Frenchman Lake	The state's latest record, from Nov 10, 2022, recommends no advisory.
Fresno River	The state's latest record, from Jun 22, 2022, recommends no advisory.
Gant Gulch	The state's latest record, from May 22, 2026, recommends no advisory.
Gibson Lake	The state's latest record, from Aug 27, 2026, recommends no advisory.
Grant Lake	The state's latest record, from Oct 7, 2026, recommends no advisory.
Grass Lake Creek	Reports on file, with no advisory level the state has classified.
Grass Valley Lake	The state's latest record, from Sep 2, 2022, recommends no advisory.
Grizzly Creek	The state's latest record, from Jun 20, 2025, recommends no advisory.
Gull Lake	The state's latest record, from Oct 7, 2026, recommends no advisory.
Hagan Community Park	The state's latest record, from Aug 19, 2025, recommends no advisory.
Harper Creek	The state's latest record, from Jul 25, 2023, recommends no advisory.
Harveston Lake	The state's latest record, from Nov 3, 2025, recommends no advisory.
Hatchet Creek	The state's latest record, from Aug 6, 2026, recommends no advisory.
Havasu Lake	The state's latest record, from Aug 31, 2026, recommends no advisory.
Hemet Golf Course	The state's latest record, from Aug 2, 2017, recommends no advisory.
Hidden Valley Lake	Reports on file, with no advisory level the state has classified.
Highland Creek	The state's latest record, from Jun 26, 2023, recommends no advisory.
Holcomb Creek	The state's latest record, from Jun 19, 2026, recommends no advisory.
Hollenbeck Park	Reports on file, with no advisory level the state has classified.
Hollister Pond	The state's latest record, from Sep 9, 2024, recommends no advisory.
Horse Mountain Creek	The state's latest record, from Aug 13, 2026, recommends no advisory.
Horseshoe Lake	The state's latest record, from Jun 30, 2021, recommends no advisory.
Horseshoe Lake	The state's latest record, from Oct 14, 2022, recommends no advisory.
Horseshoe Lake	The state's latest record, from Sep 3, 2026, recommends no advisory.
Howe Community Park	The state's latest record, from Aug 19, 2025, recommends no advisory.
Humboldt Bay	The state's latest record, from Aug 16, 2023, recommends no advisory.
Illinois River	The state's latest record, from Jul 30, 2026, recommends no advisory.
Indian Creek	The state's latest record, from Sep 1, 2023, recommends no advisory.
Indian Creek	The state's latest record, from Jun 19, 2026, recommends no advisory.
Indian Creek	The state's latest record, from Jun 24, 2021, recommends no advisory.
Indian Lakes	The state's latest record, from Aug 26, 2020, recommends no advisory.
J.C. Boyle Reservoir	The state's latest record, from Jun 17, 2021, recommends no advisory.
Japacha Creek	The state's latest record, from May 18, 2023, recommends no advisory.
Jenks Lake	The state's latest record, from Sep 15, 2025, recommends no advisory.
June Lake	The state's latest record, from Oct 7, 2026, recommends no advisory.
Kirman Cr.	The state's latest record, from Jun 4, 2026, recommends no advisory.
Kitchen Creek	The state's latest record, from Jun 11, 2024, recommends no advisory.
Klamath River Estuary	The state's latest record, from Jul 20, 2021, recommends no advisory.
Koenig Lake Creek	The state's latest record, from Sep 1, 2023, recommends no advisory.
Kumeyaay Lake	The state's latest record, from Oct 21, 2025, recommends no advisory.
Laguna Creek	The state's latest record, from Jul 3, 2026, recommends no advisory.
Laguna Grande Regional Park	The state's latest record, from Sep 1, 2022, recommends no advisory.
Laguna Niguel Park Lake	The state's latest record, from Aug 25, 2026, recommends no advisory.
Lagunitas Creek	The state's latest record, from Aug 30, 2022, recommends no advisory.
Lake Angela	The state recorded an end date of Nov 10, 2022.
Lake Arrowhead	The state's latest record, from Sep 2, 2022, recommends no advisory.
Lake Cahuilla	The state's latest record, from May 20, 2024, recommends no advisory.
Lake Calavera	Reports on file, with no advisory level the state has classified.
Lake California	The state's latest record, from Jul 18, 2022, recommends no advisory.
Lake Evans	The state's latest record, from May 15, 2026, recommends no advisory.
Lake George	The state's latest record, from Oct 14, 2022, recommends no advisory.
Lake Havasu	The state's latest record, from Nov 28, 2022, recommends no advisory.
Lake Havasu	The state's latest record, from Dec 12, 2022, recommends no advisory.
Lake Lindero	The state's latest record, from Oct 21, 2020, recommends no advisory.
Lake Mary	The state's latest record, from Oct 14, 2022, recommends no advisory.
Lake Nagasawa	Reports on file, with no advisory level the state has classified.
Lake Piru	The state's latest record, from May 25, 2021, recommends no advisory.
Lake samagatuma	Reports on file, with no advisory level the state has classified.
Lake Siskiyou	The state's latest record, from Sep 8, 2022, recommends no advisory.
Lake Skinner	The state's latest record, from Jul 7, 2022, recommends no advisory.
Lake Solano	The state recorded an end date of Nov 28, 2022.
Lake Sonoma	The state's latest record, from Aug 27, 2026, recommends no advisory.
Lake Tynan	Reports on file, with no advisory level the state has classified.
Lake Webb	The state's latest record, from May 15, 2026, recommends no advisory.
Lake Wildwood	The state's latest record, from May 22, 2024, recommends no advisory.
Lavezzola Creek	The state's latest record, from Aug 21, 2026, recommends no advisory.
Leviathan Creek	The state's latest record, from Sep 1, 2023, recommends no advisory.
Libby Lake	The state's latest record, from Aug 28, 2024, recommends no advisory.
Lily Pond	The state's latest record, from Oct 10, 2022, recommends no advisory.
Little Browns Creek	Reports on file, with no advisory level the state has classified.
Little French Creek	The state's latest record, from Jul 17, 2024, recommends no advisory.
Little Grizzly Creek	The state's latest record, from Jul 8, 2022, recommends no advisory.
Little Lost Man Creek	The state's latest record, from Sep 8, 2022, recommends no advisory.
Little Potato Slough	The state recorded an end date of Sep 2, 2022.
Little Rock Creek	The state's latest record, from Jun 26, 2026, recommends no advisory.
Little Stony Creek	The state's latest record, from May 31, 2023, recommends no advisory.
Llagas Creek	The state's latest record, from Jul 16, 2026, recommends no advisory.
Los Banos Creek Reservoir	The state's latest record, from Jul 21, 2025, recommends no advisory.
Los Jilgueros Preserve Ponds	The state's latest record, from Apr 2, 2024, recommends no advisory.
Los Penasquitos Creek	The state's latest record, from Jul 1, 2021, recommends no advisory.
Los Rasales Lake	The state's latest record, from Aug 25, 2022, recommends no advisory.
Lower American River	Reports on file, with no advisory level the state has classified.
Lower Blue Lake	The state's latest record, from Oct 17, 2024, recommends no advisory.
Lytle Creek	The state's latest record, from Jul 1, 2026, recommends no advisory.
Majella Creek	The state's latest record, from Sep 9, 2025, recommends no advisory.
Manzanita Lake	The state's latest record, from Dec 24, 2018, recommends no advisory.
Marble Creek	The state's latest record, from Sep 6, 2024, recommends no advisory.
Mare Island Shoreline Heritage Preserve	The state recorded an end date of Dec 31, 2022.
Martinez Marina	The state's latest record, from Sep 12, 2025, recommends no advisory.
Martinez Regional Shoreline Park	The state's latest record, from Sep 12, 2025, recommends no advisory.
Martis Creek Reservoir	The state's latest record, from Sep 25, 2026, recommends no advisory.
Matanzas Creek	The state's latest record, from Jun 4, 2024, recommends no advisory.
Maxwell Creek	Reports on file, with no advisory level the state has classified.
McNabney Marsh	The state's latest record, from Oct 17, 2017, recommends no advisory.
Meeks Creek	The state's latest record, from Sep 16, 2026, recommends no advisory.
Metcalf Creek	The state's latest record, from Jul 7, 2023, recommends no advisory.
Mid Grout Creek	The state's latest record, from Jun 27, 2024, recommends no advisory.
Middle Creek	The state's latest record, from Apr 17, 2026, recommends no advisory.
Mill Creek	The state's latest record, from Mar 11, 2022, recommends no advisory.
Mill Creek	The state's latest record, from Jul 30, 2026, recommends no advisory.
Millerton Lake	The state's latest record, from Aug 28, 2023, recommends no advisory.
Mission Bay	The state's latest record, from Oct 13, 2026, recommends no advisory.
Mojave Narrows Regional Park	The state's latest record, from Jun 30, 2022, recommends no advisory.
Mojave River	The state's latest record, from Jun 26, 2026, recommends no advisory.
Mokelumne River	The state's latest record, from Dec 4, 2018, recommends no advisory.
Monterey Bay	Reports on file, with no advisory level the state has classified.
Monumental Creek	The state's latest record, from Jun 30, 2021, recommends no advisory.
Moosa Canyon pond	The state's latest record, from Sep 18, 2025, recommends no advisory.
Moosehead Creek	The state's latest record, from Aug 10, 2023, recommends no advisory.
Moran Lagoon	The state's latest record, from Aug 20, 2025, recommends no advisory.
Muddy Hollow Creek	The state's latest record, from Jun 11, 2026, recommends no advisory.
Murrieta Creek	The state's latest record, from Oct 16, 2023, recommends no advisory.
Napa River	The state's latest record, from Sep 2, 2026, recommends no advisory.
Natomas East Main Drainage Canal	The state's latest record, from May 24, 2017, recommends no advisory.
Nedler Creek	The state's latest record, from Jun 30, 2021, recommends no advisory.
Nelson Creek	The state's latest record, from Jul 8, 2022, recommends no advisory.
New Hogan Reservoir	The state's latest record, from May 2, 2019, recommends no advisory.
New Melones Reservoir	The state's latest record, from Sep 2, 2020, recommends no advisory.
New York Slough	Reports on file, with no advisory level the state has classified.
North Fork Battle Creek	The state's latest record, from Sep 24, 2026, recommends no advisory.
North Fork Eel River	The state's latest record, from Sep 1, 2021, recommends no advisory.
North Fork Middle Fork Eel River	The state's latest record, from Aug 13, 2025, recommends no advisory.
North Fork Willow Creek	The state's latest record, from Jun 20, 2025, recommends no advisory.
North Laguna Creek Park	The state's latest record, from Jun 4, 2025, recommends no advisory.
North Laguna Pond	The state's latest record, from Oct 19, 2022, recommends no advisory.
North Natomas Retention Basin	The state's latest record, from Sep 12, 2025, recommends no advisory.
O'Neill Slough	The state's latest record, from Nov 13, 2017, recommends no advisory.
Oceanside Harbor	The state recorded an end date of Dec 30, 2022.
Owens River	The state's latest record, from Jul 6, 2022, recommends no advisory.
Owl Hole Spring	Reports on file, with no advisory level the state has classified.
Pacific Creek	The state's latest record, from Jul 9, 2025, recommends no advisory.
Pacific Ocean	The state recorded an end date of Dec 30, 2022.
Pacific Ocean	Reports on file, with no advisory level the state has classified.
Pacific Ocean	Reports on file, with no advisory level the state has classified.
Pacific Ocean	Reports on file, with no advisory level the state has classified.
Palacio Del Mar Estate	The state's latest record, from Sep 14, 2022, recommends no advisory.
Palo Verde Lagoon	The state's latest record, from Oct 2, 2025, recommends no advisory.
Paradise Creek	The state's latest record, from Mar 27, 2026, recommends no advisory.
Parker Pass Creek	The state's latest record, from Jul 3, 2025, recommends no advisory.
Paulin Creek	The state's latest record, from Aug 18, 2022, recommends no advisory.
Pelican Lake	The state's latest record, from Sep 3, 2026, recommends no advisory.
Pescadero Creek	The state's latest record, from Aug 30, 2022, recommends no advisory.
Petaluma River	The state's latest record, from May 19, 2026, recommends no advisory.
Pilarcitos Creek	The state's latest record, from Nov 27, 2018, recommends no advisory.
Pine Canyon	The state's latest record, from May 1, 2025, recommends no advisory.
Pine Canyon	The state's latest record, from May 3, 2024, recommends no advisory.
Pine Flat Reservoir	The state's latest record, from Aug 27, 2018, recommends no advisory.
Pine Gulch Creek	The state's latest record, from Jun 11, 2026, recommends no advisory.
Pine Valley Creek	The state's latest record, from Jul 25, 2023, recommends no advisory.
Piney Creek	The state's latest record, from Apr 8, 2026, recommends no advisory.
Pitman Creek	The state's latest record, from Aug 29, 2025, recommends no advisory.
Poison Meadow Creek	The state's latest record, from Sep 1, 2023, recommends no advisory.
Poore Creek	The state's latest record, from Aug 2, 2022, recommends no advisory.
Prairie Creek	Reports on file, with no advisory level the state has classified.
Prospect Slough	The state's latest record, from Sep 2, 2022, recommends no advisory.
Prosser Creek Reservoir	The state's latest record, from Oct 7, 2026, recommends no advisory.
Pudding Creek	The state's latest record, from Jun 29, 2022, recommends no advisory.
Pulikla Reservation	The state's latest record, from Sep 18, 2026, recommends no advisory.
Quail Lake	The state's latest record, from Oct 19, 2026, recommends no advisory.
Queatchumpah Creek	The state's latest record, from May 29, 2026, recommends no advisory.
Rancho Nuevo Creek	The state's latest record, from Mar 27, 2026, recommends no advisory.
Rathbun Creek	The state's latest record, from Jul 7, 2023, recommends no advisory.
Red Clover Creek	The state's latest record, from Jun 30, 2021, recommends no advisory.
Redwood Creek	The state's latest record, from Jun 15, 2023, recommends no advisory.
Redwood Creek	The state's latest record, from Jul 1, 2026, recommends no advisory.
Rock Creek	The state's latest record, from Aug 6, 2021, recommends no advisory.
Rock Creek	The state's latest record, from May 31, 2022, recommends no advisory.
Round Lake	The state's latest record, from Nov 3, 2020, recommends no advisory.
Russian River	The state's latest record, from Dec 15, 2022, recommends no advisory.
Sacramento River	The state recorded an end date of Sep 2, 2022.
Sacramento River	The state's latest record, from Jul 18, 2022, recommends no advisory.
Salinas River	Reports on file, with no advisory level the state has classified.
Salinas River	Reports on file, with no advisory level the state has classified.
San Felipe Creek	The state's latest record, from May 18, 2023, recommends no advisory.
San Francisco Bay	Reports on file, with no advisory level the state has classified.
San Francisco Bay, South	The state recorded an end date of Oct 14, 2022.
San Geronimo Creek	The state's latest record, from Jun 27, 2023, recommends no advisory.
San Gregorio Creek	The state recorded an end date of Dec 31, 2022.
San Jacinto River	The state's latest record, from May 3, 2024, recommends no advisory.
San Joaquin-Sacramento River	Reports on file, with no advisory level the state has classified.
San Luis Rey River estuary	The state's latest record, from Aug 22, 2024, recommends no advisory.
San Onofre Creek	The state's latest record, from Jan 3, 2023, recommends no advisory.
San Pedro Creek	The state's latest record, from Jun 6, 2022, recommends no advisory.
San Timoteo Wash	The state's latest record, from May 10, 2024, recommends no advisory.
San Vicente Reservoir	Reports on file, with no advisory level the state has classified.
San Ysidro Creek	Reports on file, with no advisory level the state has classified.
Santa Ana River Random	The state's latest record, from May 20, 2022, recommends no advisory.
Santa Lucia Creek	The state's latest record, from May 9, 2025, recommends no advisory.
Santa Paula Creek	The state's latest record, from Jun 30, 2023, recommends no advisory.
Santa Paula River	Reports on file, with no advisory level the state has classified.
Santa Ynez River	The state's latest record, from Nov 22, 2022, recommends no advisory.
Sausal Pond	The state's latest record, from Aug 29, 2025, recommends no advisory.
Schwan Lake	The state's latest record, from Aug 20, 2025, recommends no advisory.
Scotts Flat Lake	The state recorded an end date of Oct 27, 2022.
Sespe Creek	Reports on file, with no advisory level the state has classified.
Shasta River	The state's latest record, from Jun 3, 2022, recommends no advisory.
Sholes Creek	The state's latest record, from Aug 13, 2026, recommends no advisory.
Shoreline Lake	The state's latest record, from Jun 27, 2024, recommends no advisory.
Silver Lake	The state's latest record, from Sep 2, 2026, recommends no advisory.
Skyline Ponds	The state recorded an end date of Dec 28, 2022.
Slate Creek	The state's latest record, from Jul 16, 2026, recommends no advisory.
Sly Park Creek	The state's latest record, from Aug 21, 2026, recommends no advisory.
South Fork Salmon River	The state's latest record, from Aug 27, 2024, recommends no advisory.
South Fork Yuba River	The state's latest record, from Sep 25, 2023, recommends no advisory.
Spanish Creek	The state's latest record, from Jul 30, 2026, recommends no advisory.
Spratt Creek	The state's latest record, from Sep 5, 2025, recommends no advisory.
Spring Valley Lake	The state's latest record, from Aug 25, 2026, recommends no advisory.
Squaw Creek	The state's latest record, from Sep 8, 2022, recommends no advisory.
Squaw Creek	The state's latest record, from Jul 22, 2025, recommends no advisory.
St. Claire Creek	The state's latest record, from Jul 7, 2022, recommends no advisory.
Stampede Reservoir	The state's latest record, from Oct 7, 2026, recommends no advisory.
Stanislaus River	The state's latest record, from Sep 2, 2020, recommends no advisory.
Stevens Creek Reservoir	Reports on file, with no advisory level the state has classified.
Stone Lakes National Wildlife Refuge	The state's latest record, from Oct 17, 2019, recommends no advisory.
Stonewall Creek	The state's latest record, from Jul 25, 2023, recommends no advisory.
Stoney Creek	The state recorded an end date of Aug 5, 2022.
Stony Creek	The state's latest record, from May 8, 2026, recommends no advisory.
Strap Ravine	Reports on file, with no advisory level the state has classified.
Strawberry Creek	The state's latest record, from May 17, 2024, recommends no advisory.
Summit Lake	The state's latest record, from Aug 14, 2020, recommends no advisory.
Summit Lake	The state's latest record, from Sep 30, 2022, recommends no advisory.
Sunbeam Lake	The state's latest record, from Aug 30, 2022, recommends no advisory.
Swan Lake	The state's latest record, from Oct 24, 2018, recommends no advisory.
Swanson Creek	The state's latest record, from Jun 9, 2023, recommends no advisory.
Sweetwater River	The state's latest record, from Aug 25, 2025, recommends no advisory.
Tallac Creek	The state's latest record, from Jul 25, 2024, recommends no advisory.
Tamarack Lake	The state's latest record, from Aug 31, 2021, recommends no advisory.
Tanzanite Park Pond	Reports on file, with no advisory level the state has classified.
Tassajara Creek	The state's latest record, from May 9, 2025, recommends no advisory.
Temescal Creek	The state's latest record, from May 3, 2024, recommends no advisory.
Temescal Wash	The state's latest record, from May 3, 2024, recommends no advisory.
Tepee Creek	The state's latest record, from May 29, 2026, recommends no advisory.
Tequepis Canyon	The state's latest record, from Mar 27, 2026, recommends no advisory.
Thermalito Afterbay	The state's latest record, from Sep 4, 2026, recommends no advisory.
Thermalito Forebay	The state's latest record, from Sep 4, 2026, recommends no advisory.
Three Mile Slough	The state's latest record, from Dec 4, 2018, recommends no advisory.
Tom Neal Creek	The state's latest record, from Aug 6, 2026, recommends no advisory.
Topaz Lake	The state's latest record, from Sep 30, 2026, recommends no advisory.
Topaz Lake	The state's latest record, from Nov 24, 2021, recommends no advisory.
Tributary to Eel River	The state's latest record, from May 29, 2026, recommends no advisory.
Trinity Lake	The state's latest record, from Sep 2, 2026, recommends no advisory.
Trinity River South Fork	The state's latest record, from Aug 13, 2025, recommends no advisory.
Trout Creek	The state's latest record, from Jun 10, 2022, recommends no advisory.
Trout Creek	The state's latest record, from Oct 14, 2022, recommends no advisory.
Tulloch Reservoir	Reports on file, with no advisory level the state has classified.
Turtle Pond	The state's latest record, from Jun 23, 2026, recommends no advisory.
Tyler Creek	The state's latest record, from Jul 23, 2026, recommends no advisory.
UC Davis Arboretum Canal	The state's latest record, from Dec 9, 2020, recommends no advisory.
Unnamed channel	The state's latest record, from Jun 4, 2025, recommends no advisory.
Unnamed Channel	The state's latest record, from Jun 14, 2022, recommends no advisory.
Unnamed channel	Reports on file, with no advisory level the state has classified.
Unnamed Creek	The state's latest record, from May 21, 2025, recommends no advisory.
Unnamed Ditch in Trancas Canyon	Reports on file, with no advisory level the state has classified.
Unnamed Lagoon	The state recorded an end date of Dec 31, 2022.
Unnamed lake	The state's latest record, from Aug 17, 2020, recommends no advisory.
Unnamed lake in Sequoia National Park	Reports on file, with no advisory level the state has classified.
Unnamed outfall	Reports on file, with no advisory level the state has classified.
Unnamed pond	The state's latest record, from Aug 19, 2024, recommends no advisory.
Unnamed pond	The state's latest record, from Sep 23, 2019, recommends no advisory.
Unnamed pond	Reports on file, with no advisory level the state has classified.
Unnamed private pond	The state's latest record, from Jul 13, 2017, recommends no advisory.
Unnamed Retention Basin	The state recorded an end date of Oct 8, 2022.
Unnamed Retention Basin	Reports on file, with no advisory level the state has classified.
Unnamed Trib to Oils Creek	The state's latest record, from Aug 13, 2026, recommends no advisory.
Unnamed tributary of North Fork of the Middle Fork American River	Reports on file, with no advisory level the state has classified.
Unnamed Tributary to Big Carson Creek	The state's latest record, from Jun 11, 2026, recommends no advisory.
Unnamed tributary to Eel River	The state's latest record, from Apr 17, 2026, recommends no advisory.
Unnamed Tributary to Onion Creek	The state's latest record, from May 20, 2026, recommends no advisory.
Unnamed Tributary to Rock Creek	The state's latest record, from Jun 4, 2026, recommends no advisory.
Unnamed wetland	Reports on file, with no advisory level the state has classified.
Upper and Lower Blue Lakes	The state's latest record, from Sep 11, 2017, recommends no advisory.
Uvas Creek	The state's latest record, from Jul 16, 2026, recommends no advisory.
Valencia Creek	The state's latest record, from Jul 11, 2024, recommends no advisory.
Veeh Reservoir	Reports on file, with no advisory level the state has classified.
Volta State Wildlife area	The state recorded an end date of Dec 28, 2022.
Washington Lake	The state's latest record, from Aug 23, 2018, recommends no advisory.
Waukell Creek	The state's latest record, from Sep 18, 2026, recommends no advisory.
Waydalmem Creek	Reports on file, with no advisory level the state has classified.
Welch Creek	The state's latest record, from Apr 17, 2026, recommends no advisory.
West Fork Carson River	The state's latest record, from Oct 15, 2025, recommends no advisory.
Wet Meadows Reservoir	The state's latest record, from Aug 31, 2021, recommends no advisory.
Whale Rock Reservoir	The state's latest record, from May 25, 2021, recommends no advisory.
Whiskeytown Lake	The state's latest record, from Aug 28, 2023, recommends no advisory.
Willow Creek	The state's latest record, from Jul 1, 2021, recommends no advisory.
Willow Lake	The state's latest record, from Oct 7, 2019, recommends no advisory.
Wooley Creek	The state's latest record, from Jul 11, 2025, recommends no advisory.
Wrights Lake	The state's latest record, from Jul 9, 2018, recommends no advisory.
Yorty Creek	The state's latest record, from Apr 17, 2026, recommends no advisory.
Yosemite Creek	The state's latest record, from Aug 29, 2025, recommends no advisory.

Advisory data: California State Water Resources Control Board, Freshwater Harmful Algal Bloom Program, via data.ca.gov (public domain). Advisories are recommendations; reporting is voluntary and incomplete.