Quail Lake: toxic algae advisories
Quail Lake, Los Angeles County. See all Los Angeles County waters.
What the state's records say
The state's latest record, from Oct 19, 2026, recommends no advisory.
Last advisory on file: Sep 19, 2025.
That reflects what the state knew on that date. It is not a finding that the water is safe now: blooms can return within days, and many are never reported.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at Quail Lake
The state's latest record, from Oct 19, 2026, recommends no advisory. For Quail Lake, that is not the same as an all-clear for today. Look at the water before your dog goes in: keep it out of green, blue-green or scummy water and away from mats on the shore.
Satellite estimate (not an advisory)
Week ending Jan 31, 2026: about 110,000 cells/mL of cyanobacteria near the center of Quail Lake.
A satellite estimate from EPA CyAN for a 1.0 km² lake. It does not measure toxins and does not change the advisory status.
| Week ending | Estimate |
|---|---|
| Jan 31, 2026 | about 110,000 cells/mL |
| Dec 6, 2025 | about 160,000 cells/mL |
| Sep 6, 2025 | about 250,000 cells/mL |
| Aug 30, 2025 | about 22,000 cells/mL |
| Jan 18, 2025 | about 53,000 cells/mL |
| Aug 24, 2024 | about 72,000 cells/mL |
| Apr 27, 2024 | about 280,000 cells/mL |
| Feb 10, 2024 | about 390,000 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 |
|---|---|
| Quail Lake - Outlet | The state's latest record, from Oct 19, 2026, recommends no advisory. |
| Quail Lake outlet | The state's latest record, from Nov 1, 2022, recommends no advisory. |
| outlet | The state's latest record, from Dec 3, 2021, recommends no advisory. |
Advisory history
Every advisory record the state has published for Quail 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 19, 2026 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Sep 22, 2026 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Aug 24, 2026 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jul 28, 2026 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jul 14, 2026 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jul 8, 2026 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jun 30, 2026 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jun 23, 2026 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Sep 30, 2025 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Sep 19, 2025 | Quail Lake - Outlet | Caution | Updates from routine monitoring program-organization |
| Sep 16, 2025 | Quail Lake - Outlet | Caution | Updates from routine monitoring program-organization |
| Sep 2, 2025 | Quail Lake - Outlet | Caution | Updates from routine monitoring program-organization |
| Aug 18, 2025 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jul 25, 2025 | Quail Lake - Outlet | Caution | Updates from routine monitoring program-organization |
| Jul 1, 2025 | Quail Lake - Outlet | Caution | Updates from routine monitoring program-organization |
| Jul 1, 2025 | Quail Lake - Outlet | Caution | Updates from routine monitoring program-organization |
| Jun 17, 2025 | Quail Lake - Outlet | Caution | Updates from routine monitoring program-organization |
| May 27, 2025 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Apr 25, 2025 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Nov 12, 2024 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Oct 9, 2024 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Oct 1, 2024 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Sep 17, 2024 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Sep 10, 2024 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Sep 3, 2024 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Aug 22, 2024 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jul 30, 2024 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jul 15, 2024 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jun 21, 2024 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Apr 30, 2024 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Apr 30, 2024 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Oct 30, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Oct 17, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Sep 29, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Sep 27, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Sep 14, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Sep 14, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Aug 17, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Aug 8, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jul 28, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jul 28, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jul 28, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jun 15, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jun 15, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Jun 2, 2023 | Quail Lake - Outlet | None | Updates from routine monitoring program-organization |
| Nov 1, 2022 | Quail Lake outlet | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 27, 2022 | Quail Lake outlet | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 25, 2022 | Quail Lake outlet | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 18, 2022 | Quail Lake outlet | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 11, 2022 | Quail Lake outlet | Danger | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 11, 2022 | Quail Lake outlet | Warning | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 6, 2022 | Quail Lake outlet | Danger | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 23, 2022 | Quail Lake outlet | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 8, 2022 | Quail Lake outlet | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 26, 2022 | Quail Lake outlet | Caution | Updates from routine monitoring program-organization |
| Aug 3, 2022 | Quail Lake outlet | Caution | Updates from routine monitoring program-organization |
| Jul 21, 2022 | Quail Lake outlet | Caution | Updates from routine monitoring program-organization |
| Jun 21, 2022 | Quail Lake outlet | None | Updates from routine monitoring program-organization |
| Jun 16, 2022 | Quail Lake outlet | None | Updates from routine monitoring program-organization |
| May 23, 2022 | Quail Lake outlet | None | Updates from routine monitoring program-organization |
| May 23, 2022 | Quail Lake outlet | None | visual monitoring based advisory |
| Dec 3, 2021 | outlet | 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.