San Dieguito River: toxic algae advisories
San Dieguito River, San Diego County. See all San Diego County waters.
What the state's records say
Algal mat alert sign, last posted Aug 25, 2023. 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: The state recorded an advisory of a type outside the Caution, Warning and Danger levels. Read the sign posted at the water.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at San Dieguito River
The state has an advisory on file for San Dieguito River (Algal mat alert sign), last posted Aug 25, 2023, 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 |
|---|---|
| Arroyo Preserve Park | Algal mat alert sign, last posted Aug 25, 2023. No all-clear recorded. |
| San Dieguito River in Arroyo Preserve | The state's latest record, from May 17, 2023, recommends no advisory. |
Advisory history
Every advisory record the state has published for San Dieguito River, 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, 2023 | Arroyo Preserve Park | Algal mat alert sign | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| Aug 25, 2023 | Arroyo Preserve Park | Algal mat alert sign | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| Jun 28, 2023 | Arroyo Preserve Park | General awareness | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| May 23, 2023 | Arroyo Preserve Park | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| May 17, 2023 | San Dieguito River in Arroyo Preserve | None | End date recorded: Sep 22, 2022. De-posting advisory. |
| Feb 17, 2023 | San Dieguito River in Arroyo Preserve | None | End date recorded: Sep 22, 2022. De-posting advisory. |
| Sep 22, 2022 | San Dieguito River in Arroyo Preserve | None | End date recorded: Sep 22, 2022. De-posting advisory. |
| Sep 22, 2022 | San Dieguito River in Arroyo Preserve | Caution | Advisory based on visual and toxins |
| Sep 7, 2022 | San Dieguito River in Arroyo Preserve | Caution | Advisory based on visual and toxins |
| Sep 7, 2022 | San Dieguito River in Arroyo Preserve | Caution | Advisory based on visual and toxins |
| Jul 7, 2022 | San Dieguito River in Arroyo Preserve | Caution | Advisory based on visual and toxins |
| Jun 29, 2022 | San Dieguito River in Arroyo Preserve | Caution | visual monitoring based 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.