Lake Tahoe: toxic algae advisories
Lake Tahoe, El Dorado County. See all El Dorado County waters.
What the state's records say
Caution advisory, last posted Oct 7, 2026. No all-clear recorded.
15 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: Algae that can make toxins may be present. Keep people, children and pets away from algae and scum, and do not let pets drink the water.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at Lake Tahoe
The state has an advisory on file for Lake Tahoe (Caution advisory), last posted Oct 7, 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.
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 |
|---|---|
| Kiva Beach | Visual observation, last posted Oct 7, 2026. No all-clear recorded. |
| Regan Beach | Visual observation, last posted Oct 7, 2026. No all-clear recorded. |
| Connolly Beach | Visual observation, last posted Oct 7, 2026. No all-clear recorded. |
| Timber Cover marina | Visual observation, last posted Aug 28, 2026. No all-clear recorded. |
| El Dorado Beach | Visual observation, last posted Aug 22, 2025. No all-clear recorded. |
| Pope Beach Backwater | The state's latest record, from May 28, 2025, recommends no advisory. |
| Kings Beach | The state's latest record, from Jul 25, 2024, recommends no advisory. |
| Baldwin Beach | The state's latest record, from Jul 25, 2024, recommends no advisory. |
| Cove East | Caution advisory, last posted Jul 12, 2024. No all-clear recorded. |
| Barton Beach (Secret Beach) | Caution advisory, last posted Jul 12, 2024. No all-clear recorded. |
| El Dorado Beach | The state's latest record, from Sep 29, 2023, recommends no advisory. |
| Regan Beach | The state's latest record, from Jul 5, 2023, recommends no advisory. |
| El Dorado Beach | Caution advisory, last posted Oct 19, 2022. No all-clear recorded. |
| Barton Beach | Caution advisory, last posted Oct 19, 2022. No all-clear recorded. |
| Kiva Beach | Caution advisory, last posted Oct 19, 2022. No all-clear recorded. |
| Regan Beach | Caution advisory, last posted Sep 23, 2022. No all-clear recorded. |
| Connolly Beach | Caution advisory, last posted Sep 16, 2022. No all-clear recorded. |
| Mouth of Upper Truckee River as it enters Lake Tahoe | Caution advisory, last posted Sep 16, 2022. No all-clear recorded. |
| Pope Beach | The state's latest record, from Mar 18, 2022, recommends no advisory. |
| El Dorado Beach | Caution advisory, last posted Jan 7, 2022. No all-clear recorded. |
| El Dorado Beach | Caution advisory, last posted Dec 31, 2021. No all-clear recorded. |
| Timber cove marina | The state's latest record, from Nov 3, 2021, recommends no advisory. |
| Cove East | The state's latest record, from Oct 15, 2021, recommends no advisory. |
| Barton beach | The state's latest record, from Oct 14, 2021, recommends no advisory. |
| Jeameson beach | The state's latest record, from Oct 6, 2021, recommends no advisory. |
| Baldwin beach | The state's latest record, from Sep 1, 2021, recommends no advisory. |
| Private Beach on Victoria Dr. | The state's latest record, from May 27, 2021, recommends no advisory. |
Advisory history
Every advisory record the state has published for Lake Tahoe, 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 7, 2026 | Kiva Beach | Visual observation | Rec general awareness; Testing results below posting triggers; visual monitoring based advisory |
| Oct 7, 2026 | Regan Beach | Visual observation | Posted general awareness; Testing results below posting triggers; visual monitoring based advisory |
| Oct 7, 2026 | Connolly Beach | Visual observation | Rec general awareness; Testing results below posting triggers; visual monitoring based advisory |
| Aug 28, 2026 | Connolly Beach | Visual observation | Rec general awareness; Testing results below posting triggers; visual monitoring based advisory |
| Aug 28, 2026 | Regan Beach | Visual observation | Posted general awareness; Testing results below posting triggers; visual monitoring based advisory |
| Aug 28, 2026 | Kiva Beach | Visual observation | Rec general awareness; Testing results below posting triggers; visual monitoring based advisory |
| Aug 28, 2026 | Regan Beach | Visual observation | No cyano, other algae present. ; Posted general awareness; Testing results below posting triggers |
| Aug 28, 2026 | Timber Cover marina | Visual observation | No cyano, other algae present. ; Posted general awareness; Testing results below posting triggers |
| Aug 28, 2026 | Connolly Beach | Visual observation | Rec general awareness; Testing results below posting triggers |
| Jun 25, 2026 | Kiva Beach | Visual observation | Bottom/benthic bloom observed; Testing results below posting triggers |
| Jun 25, 2026 | Kiva Beach | Visual observation | No cyano, other algae present. |
| Jun 25, 2026 | Regan Beach | Visual observation | No cyano, other algae present. |
| Jun 25, 2026 | Timber Cover marina | Visual observation | No cyano, other algae present. |
| May 12, 2026 | Kiva Beach | Visual observation | Posted general awareness; Testing results below posting triggers; visual monitoring based advisory |
| May 12, 2026 | Regan Beach | Visual observation | Advisory based on visual and toxins; Testing results below posting triggers |
| May 8, 2026 | Regan Beach | Visual observation | Rec general awareness; visual monitoring based advisory |
| May 8, 2026 | Kiva Beach | Visual observation | Rec general awareness; Updates from routine monitoring program-organization; visual monitoring based advisory |
| Oct 14, 2025 | Kiva Beach | None | Confirmed no bloom |
| Oct 14, 2025 | Regan Beach | None | Confirmed no bloom |
| Oct 14, 2025 | Connolly Beach | None | Confirmed no bloom; No cyano bloom w/testing |
| Oct 14, 2025 | Connolly Beach | None | Confirmed no bloom; No cyano bloom w/testing |
| Sep 18, 2025 | Timber Cover marina | Blank in the state's file | Testing results below posting triggers |
| Sep 2, 2025 | Connolly Beach | Visual observation | Visual monitoring only-present bloom |
| Aug 22, 2025 | Kiva Beach | Visual observation | Testing results below posting triggers; Visual monitoring only-present bloom |
| Aug 22, 2025 | Regan Beach | Visual observation | Testing results below posting triggers; Visual monitoring only-present bloom |
| Aug 22, 2025 | El Dorado Beach | Visual observation | Testing results below posting triggers |
| Aug 22, 2025 | Regan Beach | Visual observation | Testing results below posting triggers; Visual monitoring only-present bloom |
| Jul 24, 2025 | Regan Beach | Visual observation | Visual monitoring only-present bloom |
| Jun 26, 2025 | Kiva Beach | Visual observation | Testing results below posting triggers; visual monitoring based advisory |
| Jun 26, 2025 | Regan Beach | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Jun 26, 2025 | El Dorado Beach | None | Testing results below posting triggers |
| May 28, 2025 | Pope Beach Backwater | None | Advisory based on visual and toxins |
| May 28, 2025 | Pope Beach Backwater | None | Under investigation |
| May 23, 2025 | Kiva Beach | None | Updates from routine monitoring program-organization |
| May 23, 2025 | Kiva Beach | None | Advisory based on visual and toxins; Testing results below posting triggers; Under investigation |
| May 23, 2025 | Kiva Beach | None | Updates from routine monitoring program-organization |
| May 23, 2025 | Regan Beach | None | Advisory based on visual and toxins; Testing results below posting triggers |
| May 23, 2025 | Regan Beach | None | Advisory based on visual and toxins; Testing results below posting triggers |
| May 9, 2025 | Pope Beach Backwater | NA - refer to Report Details | Under investigation |
| Oct 9, 2024 | Kiva Beach | Caution | Under investigation |
| Oct 9, 2024 | Regan Beach | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Oct 9, 2024 | El Dorado Beach | None | Testing results below posting triggers |
| Aug 27, 2024 | El Dorado Beach | None | Testing results below posting triggers |
| Aug 27, 2024 | Regan Beach | None | Updates from routine monitoring program-organization |
| Aug 27, 2024 | Regan Beach | General awareness | Updates from routine monitoring program-organization |
| Aug 27, 2024 | El Dorado Beach | General awareness | Testing results below posting triggers |
| Aug 15, 2024 | Kiva Beach | Caution | Under investigation |
| Jul 25, 2024 | Kings Beach | None | Testing results below posting triggers |
| Jul 25, 2024 | Kiva Beach | Algal mat general awareness sign | Testing results below posting triggers |
| Jul 25, 2024 | Baldwin Beach | None | Testing results below posting triggers |
| Jul 19, 2024 | Kiva Beach | Algal mat general awareness sign | Visual monitoring only-present bloom |
| Jul 19, 2024 | El Dorado Beach | General awareness | Testing results below posting triggers |
| Jul 12, 2024 | Regan Beach | General awareness | Under investigation |
| Jul 12, 2024 | Regan Beach | Caution | Under investigation |
| Jul 12, 2024 | Cove East | Caution | Under investigation |
| Jul 12, 2024 | Barton Beach (Secret Beach) | Caution | Under investigation |
| Jul 12, 2024 | Barton Beach (Secret Beach) | Caution | Under investigation |
| Jul 10, 2024 | Cove East | General awareness | Visual monitoring only-absent bloom |
| Jul 10, 2024 | Barton Beach (Secret Beach) | General awareness | Visual monitoring only-absent bloom |
| Jul 10, 2024 | Cove East | General awareness | Under investigation |
| Jul 8, 2024 | El Dorado Beach | Caution | Under investigation |
| Jun 20, 2024 | Regan Beach | None | Advisory based on visual and toxins; Testing results below posting triggers; visual monitoring based advisory |
| Jun 20, 2024 | Connolly Beach | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Jun 20, 2024 | Kiva Beach | None | Visual monitoring only-absent bloom |
| Jun 19, 2024 | Kiva Beach | Caution | Under investigation |
| Jun 19, 2024 | Kiva Beach | NA - refer to Report Details | Under investigation |
| Sep 29, 2023 | Kiva Beach | None | Testing results below posting triggers; Updates from routine monitoring program-organization; visual monitoring based advisory |
| Sep 29, 2023 | Regan Beach | None | Testing results below posting triggers; visual monitoring based advisory |
| Sep 29, 2023 | El Dorado Beach | None | Updates from routine monitoring program-organization |
| Sep 29, 2023 | Connolly Beach | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| Aug 29, 2023 | Kiva Beach | Visual observation | Testing results below posting triggers; Updates from routine monitoring program-organization; visual monitoring based advisory |
| Aug 29, 2023 | Regan Beach | Visual observation | Testing results below posting triggers; visual monitoring based advisory |
| Aug 29, 2023 | Connolly Beach | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| Aug 29, 2023 | Kiva Beach | Visual observation | Updates from routine monitoring program-organization |
| Aug 29, 2023 | Regan Beach | Visual observation | visual monitoring based advisory |
| Aug 17, 2023 | Regan Beach | Visual observation | visual monitoring based advisory |
| Aug 7, 2023 | Regan Beach | Caution | Under investigation |
| Jul 5, 2023 | Regan Beach | None | Updates from routine monitoring program-organization |
| Jul 5, 2023 | Kiva Beach | None | Updates from routine monitoring program-organization |
| Jul 5, 2023 | Regan Beach | None | Updates from routine monitoring program-organization |
| Jul 5, 2023 | Connolly Beach | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| Jul 5, 2023 | Connolly Beach | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| May 25, 2023 | El Dorado Beach | None | Updates from routine monitoring program-organization |
| May 25, 2023 | El Dorado Beach | None | No cyano bloom w/testing |
| May 25, 2023 | Kiva Beach | None | No cyano bloom w/testing |
| May 25, 2023 | Regan Beach | None | No cyano bloom w/testing |
| May 25, 2023 | El Dorado Beach | None | No cyano bloom w/testing |
| May 25, 2023 | Connolly Beach | None | No cyano bloom w/testing |
| Jan 1, 2023 | Regan Beach | Caution | Advisory due to historical data. |
| Oct 19, 2022 | El Dorado Beach | Caution | visual monitoring based advisory |
| Oct 19, 2022 | Barton Beach | Caution | Advisory based on visual and toxins |
| Oct 19, 2022 | Kiva Beach | Caution | Advisory based on visual and toxins |
| Oct 18, 2022 | Regan Beach | Caution | Advisory due to historical data. |
| Oct 18, 2022 | Regan Beach | Caution | Advisory due to historical data. |
| Sep 23, 2022 | Regan Beach | Caution | Advisory based on visual and toxins |
| Sep 23, 2022 | Regan Beach | Caution | Advisory based on visual and toxins |
| Sep 16, 2022 | Connolly Beach | Caution | visual monitoring based advisory |
| Sep 16, 2022 | Mouth of Upper Truckee River as it enters Lake Tahoe | Caution | visual monitoring based advisory |
| Sep 16, 2022 | Kiva Beach | Caution | Advisory based on visual and toxins; Suspected illness reported |
| Sep 2, 2022 | El Dorado Beach | Caution | visual monitoring based advisory |
| Sep 2, 2022 | Kiva Beach | Caution | Suspected illness reported |
| Sep 2, 2022 | Kiva Beach | Caution | Suspected illness reported |
| Sep 2, 2022 | Barton Beach | Caution | Advisory based on visual and toxins |
| Sep 2, 2022 | Connolly Beach | Caution | visual monitoring based advisory |
| Sep 2, 2022 | El Dorado Beach | None | |
| Sep 2, 2022 | Regan Beach | Caution | visual monitoring based advisory |
| Aug 24, 2022 | Barton Beach | Caution | Advisory based on visual and toxins |
| Aug 24, 2022 | Connolly Beach | Caution | visual monitoring based advisory |
| Aug 24, 2022 | Regan Beach | Caution | visual monitoring based advisory |
| Aug 12, 2022 | Barton Beach | Caution | Under investigation |
| Aug 12, 2022 | Connolly Beach | Caution | Under investigation |
| Jun 8, 2022 | Kiva Beach | Caution | Advisory based on visual and toxins |
| Jun 3, 2022 | Regan Beach | Caution | Under investigation |
| Jun 3, 2022 | Kiva Beach | Caution | visual monitoring based advisory |
| Jun 3, 2022 | Regan Beach | None | Testing results below posting triggers |
| Jun 3, 2022 | Regan Beach | None | Testing results below posting triggers |
| Jun 3, 2022 | El Dorado Beach | None | |
| Jun 3, 2022 | Kiva Beach | Caution | visual monitoring based advisory |
| Mar 18, 2022 | Pope Beach | None | No cyano, other algae present. |
| Jan 7, 2022 | El Dorado Beach | Caution | Advisory based on visual and toxins |
| Dec 31, 2021 | El Dorado Beach | Caution | Advisory based on visual and toxins |
| Nov 3, 2021 | Timber cove marina | None | Testing results below posting triggers |
| Oct 15, 2021 | Cove East | None | Testing results below posting triggers |
| Oct 14, 2021 | Barton beach | None | Testing results below posting triggers |
| Oct 6, 2021 | Jeameson beach | None | Testing results below posting triggers |
| Sep 1, 2021 | Baldwin beach | None | Testing results below posting triggers |
| May 27, 2021 | Private Beach on Victoria Dr. | None | Testing results below posting triggers |
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.