San Joaquin River: toxic algae advisories
San Joaquin River, Contra Costa County. See all Contra Costa County waters.
What the state's records say
Danger advisory, last posted Aug 3, 2022. No all-clear recorded.
2 reported spots here have an advisory with 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: Toxins may be at levels that can seriously harm people and animals. Stay out of the water and keep children and pets away from the water and the shore.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at San Joaquin River
The state has an advisory on file for San Joaquin River (Danger advisory), last posted Aug 3, 2022, 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 |
|---|---|
| San Joaquin River @ Twitchell Island | The state's latest record, from Sep 15, 2023, recommends no advisory. |
| San Joaquin River @ Antioch Ship Channel | The state's latest record, from Sep 15, 2023, recommends no advisory. |
| Pittsburgh Marina | Caution advisory, last posted Aug 3, 2022. No all-clear recorded. |
| New York Point | Danger advisory, last posted Aug 1, 2018. No all-clear recorded. |
Advisory history
Every advisory record the state has published for San Joaquin 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 |
|---|---|---|---|
| Sep 15, 2023 | San Joaquin River @ Twitchell Island | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 15, 2023 | San Joaquin River @ Antioch Ship Channel | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 23, 2023 | San Joaquin River @ Twitchell Island | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 23, 2023 | San Joaquin River @ Antioch Ship Channel | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 7, 2023 | San Joaquin River @ Twitchell Island | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 7, 2023 | San Joaquin River @ Antioch Ship Channel | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 22, 2023 | San Joaquin River @ Twitchell Island | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| Jun 22, 2023 | San Joaquin River @ Antioch Ship Channel | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| May 23, 2023 | San Joaquin River @ Twitchell Island | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| May 23, 2023 | San Joaquin River @ Antioch Ship Channel | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| May 23, 2023 | San Joaquin River @ Antioch Ship Channel | Blank in the state's file | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| Aug 3, 2022 | Pittsburgh Marina | Caution | visual monitoring based advisory |
| Aug 1, 2018 | New York Point | Danger |
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.