Spring Valley Lake: toxic algae advisories
Spring Valley Lake, San Bernardino County. See all San Bernardino County waters.
What the state's records say
The state's latest record, from Aug 25, 2026, recommends no advisory.
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 Spring Valley Lake
The state's latest record, from Aug 25, 2026, recommends no advisory. For Spring Valley 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.
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 |
|---|---|
| Fishing area 11 | The state's latest record, from Aug 25, 2026, recommends no advisory. |
| Fishing Area 7 | The state's latest record, from Aug 25, 2026, recommends no advisory. |
| Beach | The state's latest record, from Aug 22, 2024, recommends no advisory. |
| Fishing Area 6 | The state's latest record, from Aug 22, 2024, recommends no advisory. |
| Fishing Area 3 | The state's latest record, from Aug 22, 2024, recommends no advisory. |
Advisory history
Every advisory record the state has published for Spring Valley 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 |
|---|---|---|---|
| Aug 25, 2026 | Fishing area 11 | None | Advisory based on visual and toxins |
| Aug 25, 2026 | Fishing area 11 | None | Advisory based on visual and toxins |
| Aug 25, 2026 | Fishing Area 7 | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Jun 24, 2026 | Fishing area 11 | None | Advisory based on visual and toxins |
| Jun 24, 2026 | Fishing Area 7 | None | Advisory based on visual and toxins; Testing results below posting triggers |
| May 12, 2026 | Fishing Area 7 | None | Advisory based on visual and toxins; Testing results below posting triggers |
| May 12, 2026 | Fishing area 11 | None | Advisory based on visual and toxins |
| Aug 19, 2025 | Fishing area 11 | None | Advisory based on visual and toxins |
| Aug 19, 2025 | Fishing Area 7 | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Jun 19, 2025 | Fishing Area 7 | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Jun 19, 2025 | Fishing area 11 | None | Advisory based on visual and toxins |
| May 14, 2025 | Fishing area 11 | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| May 14, 2025 | Fishing Area 7 | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Aug 22, 2024 | Beach | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Aug 22, 2024 | Fishing Area 7 | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Aug 22, 2024 | Fishing Area 6 | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Aug 22, 2024 | Fishing Area 3 | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Jun 20, 2024 | Beach | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Jun 20, 2024 | Fishing Area 3 | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Jun 20, 2024 | Fishing Area 6 | None | Advisory based on visual and toxins; Testing results below posting triggers |
| Jun 20, 2024 | Fishing Area 7 | None | Advisory based on visual and toxins; Testing results below posting triggers |
| May 15, 2024 | Fishing Area 7 | None | No cyano, other algae present. ; Updates from routine monitoring program-organization |
| May 15, 2024 | Beach | None | No cyano, other algae present. ; Updates from routine monitoring program-organization |
| Jun 23, 2023 | Beach | None | No cyano, other algae present. ; Updates from routine monitoring program-organization |
| Jun 23, 2023 | Fishing Area 7 | None | No cyano, other algae present. ; Updates from routine monitoring program-organization |
| Jun 23, 2023 | Fishing Area 6 | None | No cyano, other algae present. ; Updates from routine monitoring program-organization |
| Jun 23, 2023 | Fishing Area 3 | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 23, 2023 | Fishing Area 3 | None | Testing results below posting triggers |
| Jun 23, 2023 | Fishing Area 6 | None | No cyano, other algae present. ; Updates from routine monitoring program-organization |
| Jun 23, 2023 | Fishing Area 7 | None | No cyano, other algae present. ; Updates from routine monitoring program-organization |
| Jun 23, 2023 | Beach | None | No cyano, other algae present. ; Updates from routine monitoring program-organization |
| May 25, 2023 | Beach | None | No cyano, other algae present. ; Updates from routine monitoring program-organization |
| May 25, 2023 | Fishing Area 7 | None | No cyano, other algae present. ; Updates from routine monitoring program-organization |
| May 25, 2023 | Fishing Area 6 | None | No cyano, other algae present. ; Updates from routine monitoring program-organization |
| May 25, 2023 | Fishing Area 3 | 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.