Diaz Lake: toxic algae advisories
Diaz Lake, Inyo County. See all Inyo County waters.
What the state's records say
Caution advisory, last posted Aug 29, 2023. No all-clear recorded.
3 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 Diaz Lake
The state has an advisory on file for Diaz Lake (Caution advisory), last posted Aug 29, 2023, 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 |
|---|---|
| Beach Area Near Dock | The state's latest record, from Sep 2, 2026, recommends no advisory. |
| Tent Area | The state's latest record, from Sep 2, 2026, recommends no advisory. |
| Tent area and boat dock | Visual observation, last posted Aug 29, 2023. No all-clear recorded. |
| Tent Area | The state's latest record, from Aug 24, 2022, recommends no advisory. |
| Beach Area Near Dock | The state's latest record, from Aug 24, 2022, recommends no advisory. |
| Tent Area | The state's latest record, from Jun 23, 2021, recommends no advisory. |
| Beach Area Near Dock | The state's latest record, from Jun 22, 2021, recommends no advisory. |
| Diaz Lake | The state's latest record, from Sep 4, 2020, recommends no advisory. |
| Diaz Lake | Caution advisory, last posted Aug 11, 2017. No all-clear recorded. |
| Diaz Lake | Caution advisory, last posted Sep 13, 2016. No all-clear recorded. |
Advisory history
Every advisory record the state has published for Diaz Lake, 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 |
|---|---|---|---|
| Sep 2, 2026 | Beach Area Near Dock | None | Advisory based on visual and toxins |
| Sep 2, 2026 | Tent Area | None | Testing results below posting triggers |
| Jul 8, 2026 | Tent Area | None | Testing results below posting triggers |
| Aug 27, 2025 | Tent Area | None | Testing results below posting triggers |
| Jul 29, 2025 | Tent Area | None | Testing results below posting triggers |
| Jun 26, 2025 | Tent Area | None | Testing results below posting triggers |
| Sep 25, 2024 | Beach Area Near Dock | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 25, 2024 | Beach Area Near Dock | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 25, 2024 | Tent Area | Caution | Lake-wide advisory; Updates from routine monitoring program-organization; Visual monitoring only-present bloom |
| Aug 28, 2024 | Tent Area | Danger | Lake-wide advisory; Updates from routine monitoring program-organization; Visual monitoring only-present bloom |
| Aug 5, 2024 | Beach Area Near Dock | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 26, 2024 | Tent Area | Caution | Lake-wide advisory; Updates from routine monitoring program-organization; Visual monitoring only-present bloom |
| Jul 26, 2024 | Tent Area | Caution | Lake-wide advisory; Updates from routine monitoring program-organization; Visual monitoring only-present bloom |
| Jul 26, 2024 | Tent Area | Caution | Lake-wide advisory; Updates from routine monitoring program-organization; Visual monitoring only-present bloom |
| Jun 26, 2024 | Beach Area Near Dock | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 26, 2024 | Beach Area Near Dock | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 26, 2024 | Beach Area Near Dock | None | Updates from routine monitoring program-organization |
| Jun 26, 2024 | Tent Area | None | Updates from routine monitoring program-organization |
| May 22, 2024 | Beach Area Near Dock | None | Updates from routine monitoring program-organization |
| May 22, 2024 | Tent Area | None | Updates from routine monitoring program-organization |
| Nov 3, 2023 | Beach Area Near Dock | None | Updates from routine monitoring program-organization |
| Nov 3, 2023 | Tent Area | None | Updates from routine monitoring program-organization |
| Oct 6, 2023 | Tent Area | None | Updates from routine monitoring program-organization |
| Oct 6, 2023 | Tent Area | None | Updates from routine monitoring program-organization |
| Oct 6, 2023 | Beach Area Near Dock | None | Updates from routine monitoring program-organization |
| Sep 11, 2023 | Beach Area Near Dock | Visual observation | Updates from routine monitoring program-organization |
| Sep 11, 2023 | Tent Area | Visual observation | Updates from routine monitoring program-organization |
| Aug 29, 2023 | Tent area and boat dock | Visual observation | Floating/planktonic bloom observed; Under investigation; visual monitoring based advisory |
| Aug 1, 2023 | Tent Area | None | Updates from routine monitoring program-organization |
| Aug 1, 2023 | Beach Area Near Dock | None | Updates from routine monitoring program-organization |
| Jul 5, 2023 | Beach Area Near Dock | None | Updates from routine monitoring program-organization |
| Jul 5, 2023 | Beach Area Near Dock | None | Updates from routine monitoring program-organization |
| Jul 5, 2023 | Tent Area | None | Updates from routine monitoring program-organization |
| Aug 24, 2022 | Tent Area | None | No cyano bloom w/testing |
| Aug 24, 2022 | Beach Area Near Dock | None | No cyano bloom w/testing |
| Aug 17, 2022 | Tent Area | None | visual monitoring based advisory |
| Aug 17, 2022 | Beach Area Near Dock | None | visual monitoring based advisory |
| Aug 17, 2022 | Tent Area | None | visual monitoring based advisory |
| Jul 6, 2022 | Beach Area Near Dock | None | No cyano, other algae present. |
| Jul 6, 2022 | Tent Area | None | No cyano, other algae present. |
| May 11, 2022 | Tent Area | None | visual monitoring based advisory |
| Jun 23, 2021 | Tent Area | None | Testing results below posting triggers |
| Jun 22, 2021 | Beach Area Near Dock | None | Testing results below posting triggers |
| Sep 4, 2020 | Diaz Lake | None | Testing results below posting triggers |
| Aug 11, 2017 | Diaz Lake | Caution | |
| Sep 13, 2016 | Diaz Lake | 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.