San Luis Reservoir: toxic algae advisories
San Luis Reservoir, Merced County. See all Merced County waters.
What the state's records say
Danger advisory, last posted Oct 19, 2026. No all-clear recorded.
8 reported spots here have an advisory with no all-clear recorded.
Reporting is voluntary, so the state may not have recorded an end even if conditions changed. Check posted signs and the official map.
What this level asks: Toxins may be at levels that can seriously harm people and animals. Stay out of the water and keep children and pets away from the water and the shore.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at San Luis Reservoir
The state has an advisory on file for San Luis Reservoir (Danger advisory), last posted Oct 19, 2026, and no all-clear recorded. Keep your dog out of the water and away from scum on the shore until the state records an end.
Satellite estimate (not an advisory)
Week ending Oct 17, 2026: about 3,800,000 cells/mL of cyanobacteria near the center of San Luis Reservoir.
A satellite estimate from EPA CyAN for a 51.9 km² lake. It does not measure toxins and does not change the advisory status.
| Week ending | Estimate |
|---|---|
| Oct 17, 2026 | about 3,800,000 cells/mL |
| Oct 10, 2026 | about 3,000,000 cells/mL |
| Oct 3, 2026 | about 2,000,000 cells/mL |
| Sep 26, 2026 | about 1,000,000 cells/mL |
| Sep 19, 2026 | about 1,500,000 cells/mL |
| Sep 12, 2026 | about 1,600,000 cells/mL |
| Sep 5, 2026 | about 210,000 cells/mL |
| Aug 29, 2026 | about 1,100,000 cells/mL |
This is a satellite estimate from the U.S. EPA's Cyanobacteria Assessment Network, not an advisory. It estimates how much cyanobacteria is in the water near the lake's center, not whether toxins are present: a high number does not mean toxins, and a low one does not mean there are none. It covers lakes of about 1 square kilometer and larger, so small ponds, dog parks and most rivers are not covered, and clouds can hide a lake for weeks. It never changes the advisory status above.
Satellite estimates: U.S. EPA Cyanobacteria Assessment Network (CyAN), from Copernicus Sentinel-3 data. Provisional, research-level estimates; EPA does not endorse this site. Checked Oct 22, 2026.
Reported spots
The state records each report at a spot, such as a beach or a boat ramp. Each spot's latest deciding record:
| Spot | Status |
|---|---|
| Dinosaur Point Boat Launch | Danger advisory, last posted Oct 19, 2026. No all-clear recorded. |
| Basalt Boat Launch (lake-wide) | Warning advisory, last posted Jun 5, 2026. No all-clear recorded. |
| Pacheco Pumping Plant | The state's latest record, from May 25, 2023, recommends no advisory. |
| Dinosaur Point Boat Launch | Caution advisory, last posted Dec 19, 2022. No all-clear recorded. |
| Pacheco Pumping Plant | Caution advisory, last posted Nov 4, 2022. No all-clear recorded. |
| Basalt Boat Launch | Caution advisory, last posted Jun 27, 2022. No all-clear recorded. |
| Basalt Boat Launch | The state's latest record, from Jan 7, 2022, recommends no advisory. |
| Basalt Boat Launch | Caution advisory, last posted Jul 16, 2021. No all-clear recorded. |
| Waterbody name submitted:Agua Hedionda Lagoon;Landmark submitted:None | Caution advisory, last posted Jun 25, 2021. No all-clear recorded. |
| San Luis Reservoir, Pacheco Pumping Plant | The state's latest record, from Nov 16, 2020, recommends no advisory. |
| San Luis Reservoir, Basalt Boat Launch | The state's latest record, from Nov 16, 2020, recommends no advisory. |
| San Luis Reservoir at Basalt Boat Launch | The state's latest record, from Jan 8, 2020, recommends no advisory. |
| San Luis Reservoir Basalt Boat Launch | The state's latest record, from Dec 7, 2018, recommends no advisory. |
| San Luis Reservoir - Basalt Road Boat Launch | The state's latest record, from Jan 3, 2018, recommends no advisory. |
| San Luis Reservoir | Caution advisory, last posted Dec 8, 2016. No all-clear recorded. |
Advisory history
Every advisory record the state has published for San Luis Reservoir, newest first. "None" is the state's record that no advisory was recommended on that date. "NA" records do not change a status.
| Date | Spot | State's level | Notes |
|---|---|---|---|
| Oct 19, 2026 | Dinosaur Point Boat Launch | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 9, 2026 | Dinosaur Point Boat Launch | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 2, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 29, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 10, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 24, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 7, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 31, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 29, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 16, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 10, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 3, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 30, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 24, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 12, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 8, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 5, 2026 | Basalt Boat Launch (lake-wide) | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 5, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 22, 2026 | Basalt Boat Launch (lake-wide) | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 22, 2026 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 18, 2026 | Basalt Boat Launch (lake-wide) | Warning | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 8, 2025 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization |
| Dec 8, 2025 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization |
| Oct 14, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 2, 2025 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 19, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 2, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 22, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 18, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 11, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 1, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 25, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 21, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 14, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 7, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 1, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 23, 2025 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| Jun 12, 2025 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| Jun 6, 2025 | Dinosaur Point Boat Launch | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 2, 2025 | Dinosaur Point Boat Launch | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 28, 2025 | Dinosaur Point Boat Launch | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jan 21, 2025 | Dinosaur Point Boat Launch | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jan 10, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jan 7, 2025 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 20, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 17, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 9, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 3, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 3, 2024 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 22, 2024 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 15, 2024 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 14, 2024 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 7, 2024 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 25, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 18, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 9, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 26, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 20, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 11, 2024 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 30, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 23, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 20, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 13, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 2, 2024 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 1, 2024 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jul 19, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jul 12, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jul 9, 2024 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jun 28, 2024 | Dinosaur Point Boat Launch | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 14, 2024 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| Jun 7, 2024 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| May 30, 2024 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| May 23, 2024 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| Nov 27, 2023 | Dinosaur Point Boat Launch | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 9, 2023 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 3, 2023 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 27, 2023 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 19, 2023 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 16, 2023 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 9, 2023 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 29, 2023 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 29, 2023 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 27, 2023 | Dinosaur Point Boat Launch | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 27, 2023 | Dinosaur Point Boat Launch | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 15, 2023 | Dinosaur Point Boat Launch | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 6, 2023 | Dinosaur Point Boat Launch | General awareness | Advisory based on visual and toxins; Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 31, 2023 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 18, 2023 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization |
| Aug 17, 2023 | Dinosaur Point Boat Launch | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 8, 2023 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization |
| Jul 28, 2023 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| Jul 14, 2023 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| Jul 7, 2023 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization |
| Jun 29, 2023 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization |
| Jun 23, 2023 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization |
| Jun 15, 2023 | Dinosaur Point Boat Launch | None | Updates from routine monitoring program-organization |
| Jun 7, 2023 | Dinosaur Point Boat Launch | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 25, 2023 | Dinosaur Point Boat Launch | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 25, 2023 | Pacheco Pumping Plant | None | Updates from routine monitoring program-organization |
| May 2, 2023 | Pacheco Pumping Plant | None | Updates from routine monitoring program-organization |
| Jan 13, 2023 | Dinosaur Point Boat Launch | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jan 13, 2023 | Dinosaur Point Boat Launch | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jan 13, 2023 | Dinosaur Point Boat Launch | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jan 13, 2023 | Dinosaur Point Boat Launch | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jan 13, 2023 | Dinosaur Point Boat Launch | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jan 6, 2023 | Dinosaur Point Boat Launch | Caution | Updates from routine monitoring program-organization |
| Dec 19, 2022 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Dec 14, 2022 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Dec 2, 2022 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 28, 2022 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 18, 2022 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 15, 2022 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 4, 2022 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Nov 4, 2022 | Pacheco Pumping Plant | Caution | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 1, 2022 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Nov 1, 2022 | Pacheco Pumping Plant | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 1, 2022 | Pacheco Pumping Plant | Caution | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 21, 2022 | Pacheco Pumping Plant | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 21, 2022 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Oct 21, 2022 | Dinosaur Point Boat Launch | Caution | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Oct 21, 2022 | Pacheco Pumping Plant | Caution | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 17, 2022 | Pacheco Pumping Plant | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 17, 2022 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Oct 7, 2022 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Oct 7, 2022 | Pacheco Pumping Plant | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 30, 2022 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Sep 30, 2022 | Pacheco Pumping Plant | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 26, 2022 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Sep 26, 2022 | Pacheco Pumping Plant | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 16, 2022 | Dinosaur Point Boat Launch | Danger | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Sep 16, 2022 | Pacheco Pumping Plant | Danger | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 13, 2022 | Dinosaur Point Boat Launch | Danger | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Sep 13, 2022 | Pacheco Pumping Plant | Danger | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 8, 2022 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Sep 8, 2022 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Sep 8, 2022 | Pacheco Pumping Plant | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 30, 2022 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Aug 30, 2022 | Pacheco Pumping Plant | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 22, 2022 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Aug 22, 2022 | Pacheco Pumping Plant | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 18, 2022 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Aug 12, 2022 | Dinosaur Point Boat Launch | Warning | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory |
| Aug 9, 2022 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory |
| Jul 25, 2022 | Dinosaur Point Boat Launch | Warning | Lake-wide advisory |
| Jul 11, 2022 | Dinosaur Point Boat Launch | Danger | Lake-wide advisory |
| Jul 1, 2022 | Dinosaur Point Boat Launch | Danger | Lake-wide advisory |
| Jul 1, 2022 | Dinosaur Point Boat Launch | Danger | Updates from routine monitoring program-organization |
| Jun 27, 2022 | Basalt Boat Launch | Caution | Updates from routine monitoring program-organization |
| Jun 27, 2022 | Pacheco Pumping Plant | None | Updates from routine monitoring program-organization |
| Jun 20, 2022 | Dinosaur Point Boat Launch | Caution | Updates from routine monitoring program-organization |
| Jun 20, 2022 | Dinosaur Point Boat Launch | Caution | Updates from routine monitoring program-organization |
| Jun 14, 2022 | Dinosaur Point Boat Launch | Caution | Updates from routine monitoring program-organization |
| Jun 14, 2022 | Pacheco Pumping Plant | None | Updates from routine monitoring program-organization |
| Jun 3, 2022 | Basalt Boat Launch | Warning | Updates from routine monitoring program-organization |
| Jun 1, 2022 | Pacheco Pumping Plant | None | Updates from routine monitoring program-organization |
| Jun 1, 2022 | Basalt Boat Launch | Warning | Updates from routine monitoring program-organization |
| Apr 5, 2022 | Basalt Boat Launch | None | Updates from routine monitoring program-organization |
| Jan 7, 2022 | Basalt Boat Launch | None | Testing results below posting triggers |
| Jul 16, 2021 | Basalt Boat Launch | Caution | Advisory based on visual and toxins |
| Jun 25, 2021 | Waterbody name submitted:Agua Hedionda Lagoon;Landmark submitted:None | Caution | visual monitoring based advisory |
| Nov 16, 2020 | San Luis Reservoir, Pacheco Pumping Plant | None | De-posting advisory. |
| Nov 16, 2020 | San Luis Reservoir, Basalt Boat Launch | None | |
| Jan 8, 2020 | San Luis Reservoir at Basalt Boat Launch | None | |
| Dec 7, 2018 | San Luis Reservoir Basalt Boat Launch | None | |
| Jan 3, 2018 | San Luis Reservoir - Basalt Road Boat Launch | None | |
| Dec 8, 2016 | San Luis Reservoir | Caution |
Source
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. The state's data. 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.