El Estero Lake: toxic algae advisories
El Estero Lake, Monterey County. See all Monterey County waters.
What the state's records say
Caution advisory, last posted May 25, 2021. 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 El Estero Lake
The state has an advisory on file for El Estero Lake (Caution advisory), last posted May 25, 2021, 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 |
|---|---|
| Bridge leading to San Carlos Cemetery and Fremont St. | Reports on file, with no advisory level the state has classified. |
| El Estero dock | The state's latest record, from Oct 28, 2022, recommends no advisory. |
| El Estero Lake | Caution advisory, last posted May 25, 2021. No all-clear recorded. |
Advisory history
Every advisory record the state has published for El Estero 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 |
|---|---|---|---|
| Dec 11, 2025 | Bridge leading to San Carlos Cemetery and Fremont St. | NA - refer to Report Details | Suspected bloom, investigation ongoing |
| Oct 28, 2022 | El Estero dock | None | Testing results below posting triggers |
| Sep 1, 2022 | El Estero dock | None | Testing results below posting triggers |
| Jun 30, 2022 | El Estero dock | None | Testing results below posting triggers |
| Jun 30, 2022 | El Estero dock | None | Testing results below posting triggers |
| May 19, 2022 | El Estero dock | None | Testing results below posting triggers |
| May 25, 2021 | El Estero Lake | Caution | Advisory based on visual and toxins |
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.