Pyramid Lake: toxic algae advisories
Pyramid Lake, Los Angeles County. See all Los Angeles County waters.
What the state's records say
Warning advisory, last posted Oct 14, 2026. No all-clear recorded.
5 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 harm people and animals. Do not swim or let children or pets in the water, and stay away from scum.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at Pyramid Lake
The state has an advisory on file for Pyramid Lake (Warning advisory), last posted Oct 14, 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 3, 2026: about 180,000 cells/mL of cyanobacteria near the center of Pyramid Lake.
A satellite estimate from EPA CyAN for a 4.8 km² lake. It does not measure toxins and does not change the advisory status.
| Week ending | Estimate |
|---|---|
| Oct 3, 2026 | about 180,000 cells/mL |
| Sep 26, 2026 | about 380,000 cells/mL |
| Sep 19, 2026 | about 260,000 cells/mL |
| Sep 12, 2026 | about 360,000 cells/mL |
| Sep 5, 2026 | about 430,000 cells/mL |
| Aug 29, 2026 | about 210,000 cells/mL |
| Aug 22, 2026 | about 690,000 cells/mL |
| Aug 15, 2026 | about 500,000 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 |
|---|---|
| Pyramid Lake, Emigrant Landing Swim beach | Warning advisory, last posted Oct 14, 2026. No all-clear recorded. |
| Pyramid Lake, Vaquero Swim beach | Warning advisory, last posted Oct 14, 2026. No all-clear recorded. |
| Beartrap day use | Caution advisory, last posted Jul 18, 2025. No all-clear recorded. |
| Bear trap beach (boat-in beach) | Caution advisory, last posted Jul 3, 2025. No all-clear recorded. |
| Pyramid Lake, outlet, surface | The state's latest record, from Dec 10, 2024, recommends no advisory. |
| Emigrant Landing Swim Beach | The state's latest record, from Jul 12, 2021, recommends no advisory. |
| Vaquero Swim Beach | The state's latest record, from Jul 12, 2021, recommends no advisory. |
| outlet/Angeles Tunnel inlet | The state's latest record, from Jul 12, 2021, recommends no advisory. |
| Pyramid Lake, outlet/Angeles Tunnel inlet | The state's latest record, from Nov 5, 2020, recommends no advisory. |
| Pyramid Lake, Vaquero Swim Beach | The state's latest record, from Sep 25, 2020, recommends no advisory. |
| Pyramid Lake, Emigrant Landing Swim Beach | The state's latest record, from Sep 25, 2020, recommends no advisory. |
| Pyramid Lake | The state's latest record, from Oct 6, 2018, recommends no advisory. |
| Pyramid Lake | Caution advisory, last posted Oct 20, 2017. No all-clear recorded. |
| Pyramid Lake | The state's latest record, from Oct 12, 2016, recommends no advisory. |
Advisory history
Every advisory record the state has published for Pyramid 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 |
|---|---|---|---|
| Oct 14, 2026 | Pyramid Lake, Emigrant Landing Swim beach | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 14, 2026 | Pyramid Lake, Vaquero Swim beach | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 30, 2026 | Pyramid Lake, Vaquero Swim beach | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 30, 2026 | Pyramid Lake, Emigrant Landing Swim beach | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 17, 2026 | Pyramid Lake, Emigrant Landing Swim beach | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 17, 2026 | Pyramid Lake, Vaquero Swim beach | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 24, 2026 | Pyramid Lake, Vaquero Swim beach | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 24, 2026 | Pyramid Lake, Emigrant Landing Swim beach | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 11, 2026 | Pyramid Lake, Vaquero Swim beach | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 11, 2026 | Pyramid Lake, Emigrant Landing Swim beach | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 28, 2026 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 28, 2026 | Pyramid Lake, Emigrant Landing Swim beach | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 15, 2026 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 15, 2026 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 8, 2026 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 8, 2026 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 30, 2026 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 30, 2026 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 23, 2026 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 23, 2026 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 9, 2026 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 9, 2026 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 1, 2026 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 1, 2026 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 3, 2025 | Pyramid Lake, Emigrant Landing Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 25, 2025 | Pyramid Lake, Vaquero Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 25, 2025 | Pyramid Lake, Emigrant Landing Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 25, 2025 | Pyramid Lake, Vaquero Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 18, 2025 | Pyramid Lake, Vaquero Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 18, 2025 | Pyramid Lake, Emigrant Landing Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 14, 2025 | Pyramid Lake, Emigrant Landing Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 14, 2025 | Pyramid Lake, Vaquero Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 1, 2025 | Pyramid Lake, Emigrant Landing Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 1, 2025 | Pyramid Lake, Vaquero Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 25, 2025 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 24, 2025 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 24, 2025 | Pyramid Lake, Emigrant Landing Swim beach | Warning | Updates from routine monitoring program-organization |
| Jul 24, 2025 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 18, 2025 | Beartrap day use | Caution | Updates from routine monitoring program-organization |
| Jul 18, 2025 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 18, 2025 | Pyramid Lake, Emigrant Landing Swim beach | Warning | Updates from routine monitoring program-organization |
| Jul 3, 2025 | Bear trap beach (boat-in beach) | Caution | Floating/planktonic bloom observed; Suspected illness reported |
| Jul 1, 2025 | Pyramid Lake, Emigrant Landing Swim beach | Warning | Updates from routine monitoring program-organization |
| Jul 1, 2025 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jun 26, 2025 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jun 26, 2025 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Jun 17, 2025 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Jun 17, 2025 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jun 10, 2025 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jun 10, 2025 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| May 28, 2025 | Pyramid Lake, Emigrant Landing Swim beach | None | Updates from routine monitoring program-organization |
| May 28, 2025 | Pyramid Lake, Vaquero Swim beach | None | Updates from routine monitoring program-organization |
| Dec 10, 2024 | Pyramid Lake, Vaquero Swim beach | None | Updates from routine monitoring program-organization |
| Dec 10, 2024 | Pyramid Lake, Emigrant Landing Swim beach | None | Updates from routine monitoring program-organization |
| Dec 10, 2024 | Pyramid Lake, outlet, surface | None | Updates from routine monitoring program-organization |
| Nov 8, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Nov 8, 2024 | Pyramid Lake, Emigrant Landing Swim beach | None | Updates from routine monitoring program-organization |
| Nov 8, 2024 | Pyramid Lake, outlet, surface | None | Updates from routine monitoring program-organization |
| Oct 23, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 23, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 23, 2024 | Pyramid Lake, outlet, surface | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2024 | Pyramid Lake, outlet, surface | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 1, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 1, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 1, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 1, 2024 | Pyramid Lake, outlet, surface | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 24, 2024 | Pyramid Lake, outlet, surface | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 24, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 17, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 17, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 17, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 17, 2024 | Pyramid Lake, outlet, surface | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 10, 2024 | Pyramid Lake, outlet, surface | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 10, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 10, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 3, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 3, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 3, 2024 | Pyramid Lake, outlet, surface | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 26, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 26, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 21, 2024 | Pyramid Lake, outlet, surface | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 21, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 21, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 21, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 21, 2024 | Pyramid Lake, outlet, surface | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 13, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 30, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 30, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 30, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 30, 2024 | Pyramid Lake, outlet, surface | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 25, 2024 | Pyramid Lake, outlet, surface | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 25, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 25, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 15, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 15, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 15, 2024 | Pyramid Lake, outlet, surface | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 8, 2024 | Pyramid Lake, Vaquero Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 8, 2024 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 8, 2024 | Pyramid Lake, outlet, surface | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 21, 2024 | Pyramid Lake, Vaquero Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 21, 2024 | Pyramid Lake, Emigrant Landing Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 12, 2024 | Pyramid Lake, Emigrant Landing Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 12, 2024 | Pyramid Lake, Vaquero Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 29, 2024 | Pyramid Lake, Vaquero Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 29, 2024 | Pyramid Lake, Emigrant Landing Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 24, 2024 | Pyramid Lake, Vaquero Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 24, 2024 | Pyramid Lake, Emigrant Landing Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Apr 30, 2024 | Pyramid Lake, Vaquero Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Apr 30, 2024 | Pyramid Lake, Emigrant Landing Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Apr 30, 2024 | Pyramid Lake, outlet, surface | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 30, 2023 | Pyramid Lake, outlet, surface | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 17, 2023 | Pyramid Lake, outlet, surface | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 29, 2023 | Pyramid Lake, outlet, surface | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 27, 2023 | Pyramid Lake, outlet, surface | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 21, 2023 | Pyramid Lake, outlet, surface | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 21, 2023 | Pyramid Lake, outlet, surface | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 21, 2023 | Pyramid Lake, Emigrant Landing Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 21, 2023 | Pyramid Lake, Vaquero Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 21, 2023 | Pyramid Lake, Vaquero Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 21, 2023 | Pyramid Lake, Emigrant Landing Swim beach | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 21, 2023 | Pyramid Lake, outlet, surface | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 17, 2023 | Pyramid Lake, outlet, surface | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 17, 2023 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 17, 2023 | Pyramid Lake, Vaquero Swim beach | Caution | Advisory based on visual and toxins; Lake-wide advisory; Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 9, 2023 | Pyramid Lake, Vaquero Swim beach | Caution | Advisory based on visual and toxins; Lake-wide advisory; Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 8, 2023 | Pyramid Lake, Emigrant Landing Swim beach | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 8, 2023 | Pyramid Lake, outlet, surface | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 8, 2023 | Pyramid Lake, outlet, surface | Danger | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 8, 2023 | Pyramid Lake, Emigrant Landing Swim beach | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 8, 2023 | Pyramid Lake, Vaquero Swim beach | Danger | Advisory based on visual and toxins; Lake-wide advisory; Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 28, 2023 | Pyramid Lake, Vaquero Swim beach | Danger | Advisory based on visual and toxins; Lake-wide advisory; Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 28, 2023 | Pyramid Lake, outlet, surface | Danger | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 6, 2023 | Pyramid Lake, Emigrant Landing Swim beach | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 6, 2023 | Pyramid Lake, outlet, surface | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 6, 2023 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 6, 2023 | Pyramid Lake, Vaquero Swim beach | Caution | Advisory based on visual and toxins; Lake-wide advisory; Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 5, 2023 | Pyramid Lake, Vaquero Swim beach | Caution | Advisory based on visual and toxins; Lake-wide advisory; Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 5, 2023 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 5, 2023 | Pyramid Lake, outlet, surface | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 23, 2023 | Pyramid Lake, Vaquero Swim beach | Caution | Advisory based on visual and toxins; Lake-wide advisory; Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 23, 2023 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Lake-wide advisory; Updates from routine monitoring program-organization; visual monitoring based advisory |
| Jun 23, 2023 | Pyramid Lake, outlet, surface | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 15, 2023 | Pyramid Lake, outlet, surface | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jun 15, 2023 | Pyramid Lake, Emigrant Landing Swim beach | None | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Jun 15, 2023 | Pyramid Lake, Vaquero Swim beach | None | Advisory based on visual and toxins; Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 7, 2023 | Pyramid Lake, Vaquero Swim beach | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jun 7, 2023 | Pyramid Lake, Emigrant Landing Swim beach | None | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Jun 7, 2023 | Pyramid Lake, outlet, surface | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jun 2, 2023 | Pyramid Lake, Vaquero Swim beach | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jun 2, 2023 | Pyramid Lake, Emigrant Landing Swim beach | None | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Jun 2, 2023 | Pyramid Lake, outlet, surface | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 1, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 1, 2022 | Pyramid Lake, Vaquero Swim beach | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 1, 2022 | Pyramid Lake, outlet, surface | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 27, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 27, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 27, 2022 | Pyramid Lake, outlet, surface | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 25, 2022 | Pyramid Lake, outlet, surface | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 25, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 25, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 18, 2022 | Pyramid Lake, outlet, surface | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 18, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 18, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 7, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 7, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 7, 2022 | Pyramid Lake, outlet, surface | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 23, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 23, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 23, 2022 | Pyramid Lake, outlet, surface | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 16, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 16, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 8, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 8, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 26, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Aug 26, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Aug 19, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Aug 19, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Aug 11, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Aug 11, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Aug 3, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Aug 3, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 27, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 27, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 21, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 21, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 13, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 13, 2022 | Pyramid Lake, Vaquero Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 13, 2022 | Pyramid Lake, Emigrant Landing Swim beach | Caution | Updates from routine monitoring program-organization |
| Jul 7, 2022 | Pyramid Lake, Vaquero Swim beach | None | Updates from routine monitoring program-organization |
| Jul 7, 2022 | Pyramid Lake, Emigrant Landing Swim beach | None | Updates from routine monitoring program-organization |
| Jul 7, 2022 | Pyramid Lake, outlet, surface | None | Updates from routine monitoring program-organization |
| Jun 21, 2022 | Pyramid Lake, Vaquero Swim beach | None | Updates from routine monitoring program-organization |
| Jun 21, 2022 | Pyramid Lake, Emigrant Landing Swim beach | None | Updates from routine monitoring program-organization |
| Jun 21, 2022 | Pyramid Lake, outlet, surface | None | Updates from routine monitoring program-organization |
| Jun 16, 2022 | Pyramid Lake, Vaquero Swim beach | None | Updates from routine monitoring program-organization |
| Jun 16, 2022 | Pyramid Lake, Emigrant Landing Swim beach | None | Updates from routine monitoring program-organization |
| Jun 3, 2022 | Pyramid Lake, Vaquero Swim beach | None | Updates from routine monitoring program-organization |
| Jun 3, 2022 | Pyramid Lake, Emigrant Landing Swim beach | None | Updates from routine monitoring program-organization |
| May 23, 2022 | Pyramid Lake, Vaquero Swim beach | None | Updates from routine monitoring program-organization |
| May 23, 2022 | Pyramid Lake, Emigrant Landing Swim beach | None | Updates from routine monitoring program-organization |
| May 23, 2022 | Pyramid Lake, outlet, surface | None | Updates from routine monitoring program-organization |
| May 23, 2022 | Pyramid Lake, Vaquero Swim beach | None | visual monitoring based advisory |
| May 23, 2022 | Pyramid Lake, Emigrant Landing Swim beach | None | visual monitoring based advisory |
| May 23, 2022 | Pyramid Lake, outlet, surface | None | visual monitoring based advisory |
| Jul 12, 2021 | Emigrant Landing Swim Beach | None | Testing results below posting triggers |
| Jul 12, 2021 | Vaquero Swim Beach | None | Testing results below posting triggers |
| Jul 12, 2021 | outlet/Angeles Tunnel inlet | None | Testing results below posting triggers |
| Nov 5, 2020 | Pyramid Lake, outlet/Angeles Tunnel inlet | None | |
| Sep 25, 2020 | Pyramid Lake, Vaquero Swim Beach | None | |
| Sep 25, 2020 | Pyramid Lake, Emigrant Landing Swim Beach | None | |
| Oct 6, 2018 | Pyramid Lake | None | |
| Oct 20, 2017 | Pyramid Lake | Caution | |
| Oct 12, 2016 | Pyramid Lake | None |
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.