Weist Lake: toxic algae advisories
Weist Lake, Imperial County. See all Imperial County waters.
What the state's records say
Caution advisory, last posted Aug 27, 2026. 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 Weist Lake
The state has an advisory on file for Weist Lake (Caution advisory), last posted Aug 27, 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 |
|---|---|
| Southeast corner | Caution advisory, last posted Aug 27, 2026. No all-clear recorded. |
| Weist Lake | The state recorded an end date of Sep 14, 2022. |
| Wiest Lake | The state's latest record, from Mar 17, 2020, recommends no advisory. |
Advisory history
Every advisory record the state has published for Weist 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 27, 2026 | Southeast corner | Caution | Lake-wide advisory |
| Jun 23, 2026 | Southeast corner | Caution | Lake-wide advisory |
| May 19, 2026 | Southeast corner | None | Lake-wide advisory |
| Aug 20, 2025 | Southeast corner | Caution | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory; No cyano bloom w/testing |
| Jun 26, 2025 | Southeast corner | Caution | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory; No cyano bloom w/testing |
| May 19, 2025 | Southeast corner | Caution | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory; No cyano bloom w/testing |
| Aug 21, 2024 | Southeast corner | Warning | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory; No cyano bloom w/testing |
| Aug 21, 2024 | Southeast corner | Caution | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory; No cyano bloom w/testing |
| Aug 21, 2024 | Southeast corner | Warning | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory; No cyano bloom w/testing |
| Jul 30, 2024 | Southeast corner | Visual observation | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory; No cyano bloom w/testing |
| Jun 20, 2024 | Southeast corner | Caution | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory; No cyano bloom w/testing |
| May 16, 2024 | Southeast corner | Caution | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory; No cyano bloom w/testing |
| Jun 26, 2023 | Southeast corner | Caution | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory; No cyano bloom w/testing |
| Jun 15, 2023 | Southeast corner | Warning | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory; No cyano bloom w/testing |
| Jun 1, 2023 | Southeast corner | Visual observation | Suspected illness reported; Visual monitoring only-present bloom |
| Jun 1, 2023 | Southeast corner | NA - refer to Report Details | Suspected illness reported; Visual monitoring only-present bloom |
| Aug 31, 2022 | Weist Lake | Caution | End date recorded: Sep 14, 2022. Lake-wide advisory; Suspected bloom, investigation ongoing |
| Aug 31, 2022 | Weist Lake | None | End date recorded: Sep 14, 2022. Testing results below posting triggers |
| Aug 31, 2022 | Weist Lake | Caution | End date recorded: Sep 14, 2022. Alert-high concentration toxins |
| Jul 13, 2022 | Weist Lake | Warning | Updates from routine monitoring program-organization |
| Jun 23, 2022 | Weist Lake | Warning | Updates from routine monitoring program-organization |
| May 27, 2022 | Weist Lake | Caution | Updates from routine monitoring program-organization |
| Mar 17, 2020 | Wiest Lake | None | De-posting advisory. |
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.