San Joaquin River: toxic algae advisories
San Joaquin River, San Joaquin County. See all San Joaquin County waters.
What the state's records say
Danger advisory, last posted Sep 8, 2022. No all-clear recorded.
19 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 Sep 8, 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 |
|---|---|
| Windmill Cove (WC) | The state's latest record, from Oct 1, 2026, recommends no advisory. |
| Stockton Rod and Gun Club (SJ) | The state's latest record, from Sep 25, 2024, recommends no advisory. |
| San Joaquin River @ Buckley Cove | The state's latest record, from Sep 15, 2023, recommends no advisory. |
| San Joaquin River @ Potato Slough | The state's latest record, from Sep 15, 2023, recommends no advisory. |
| Stockton Turning Basin (R3) | The state's latest record, from Nov 14, 2022, recommends no advisory. |
| Dos Reis Regional Park | Caution advisory, last posted Sep 8, 2022. No all-clear recorded. |
| Mossdale Crossing Regional Park | Caution advisory, last posted Sep 1, 2022. No all-clear recorded. |
| Dad's Point | Caution advisory, last posted Aug 9, 2022. No all-clear recorded. |
| Lost Isle, Acker Island | Caution advisory, last posted Aug 9, 2022. No all-clear recorded. |
| East of Blind Pt (EZ2_SJR) | Caution advisory, last posted Jul 22, 2022. No all-clear recorded. |
| West of West Island (EZ6_SJR) | Caution advisory, last posted Jul 22, 2022. No all-clear recorded. |
| West of West Island (D12) | Caution advisory, last posted Jul 22, 2022. No all-clear recorded. |
| between Calaveras River and Buckley Cove (R4) | Caution advisory, last posted Jul 15, 2022. No all-clear recorded. |
| East End of Rough and Ready Island (R2) | Caution advisory, last posted Jul 15, 2022. No all-clear recorded. |
| at Buckley Cove North | Caution advisory, last posted Jul 9, 2021. No all-clear recorded. |
| San Joaquin River, at Potato Point | Caution advisory, last posted Oct 1, 2020. No all-clear recorded. |
| San Joaquin River, at Lost Isle | Caution advisory, last posted Oct 1, 2020. No all-clear recorded. |
| San Joaquin River, at Tinsley Island | Caution advisory, last posted Sep 30, 2020. No all-clear recorded. |
| San Joaquin River, at Buckley Cove | Caution advisory, last posted Aug 25, 2020. No all-clear recorded. |
| San Joaquin River at Louis Park | Danger advisory, last posted Aug 25, 2020. No all-clear recorded. |
| Port of Stockton | Danger advisory, last posted Aug 25, 2020. No all-clear recorded. |
| Port of Stockton, by I-5 bridge | Caution advisory, last posted Jul 10, 2020. No all-clear recorded. |
| Ward Island, San Joaquin River Stockton Delta Area | Caution advisory, last posted Aug 27, 2019. No all-clear recorded. |
| San Joaquin River at Tinsley Island | The state's latest record, from Dec 4, 2018, recommends no advisory. |
| San Joaquin River above Dos Reis | The state's latest record, from Dec 4, 2018, recommends no advisory. |
| San Joaquin River (Stockton Deep Water Ship Channel) | The state's latest record, from Sep 21, 2017, recommends no advisory. |
| San Joaquin River (Stockton Deep Water Ship Channel) | The state's latest record, from Sep 21, 2017, recommends no advisory. |
| San Joaquin River (Stockton Deep Water Ship Channel) | The state's latest record, from Sep 21, 2017, recommends no advisory. |
| San Joaquin River (Stockton Deep Water Ship Channel) | The state's latest record, from Sep 21, 2017, recommends no advisory. |
| San Joaquin River (Stockton Deep Water Ship Channel) | Caution advisory, last posted Sep 9, 2016. 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 |
|---|---|---|---|
| Oct 1, 2026 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 2, 2026 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 30, 2026 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 2, 2026 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 11, 2026 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 20, 2026 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 2, 2025 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 3, 2025 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Aug 7, 2025 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Jul 24, 2025 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Jul 2, 2025 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 5, 2025 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 5, 2025 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 25, 2024 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 25, 2024 | Stockton Rod and Gun Club (SJ) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 23, 2024 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 23, 2024 | Windmill Cove (WC) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 23, 2024 | Windmill Cove (WC) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 23, 2024 | Stockton Rod and Gun Club (SJ) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 26, 2024 | Windmill Cove (WC) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jul 26, 2024 | Stockton Rod and Gun Club (SJ) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 20, 2024 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 20, 2024 | Stockton Rod and Gun Club (SJ) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 16, 2024 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 16, 2024 | Stockton Rod and Gun Club (SJ) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 29, 2023 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 29, 2023 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 29, 2023 | Stockton Rod and Gun Club (SJ) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 15, 2023 | San Joaquin River @ Buckley Cove | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 15, 2023 | San Joaquin River @ Potato Slough | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 24, 2023 | Stockton Rod and Gun Club (SJ) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 24, 2023 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 24, 2023 | Windmill Cove (WC) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 24, 2023 | Stockton Rod and Gun Club (SJ) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 23, 2023 | San Joaquin River @ Buckley Cove | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 23, 2023 | San Joaquin River @ Potato Slough | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 7, 2023 | San Joaquin River @ Buckley Cove | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 7, 2023 | San Joaquin River @ Potato Slough | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 21, 2023 | Windmill Cove (WC) | None | Updates from routine monitoring program-organization |
| Jul 21, 2023 | Stockton Rod and Gun Club (SJ) | None | Updates from routine monitoring program-organization |
| Jun 22, 2023 | San Joaquin River @ Buckley Cove | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| Jun 22, 2023 | San Joaquin River @ Potato Slough | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| Jun 16, 2023 | Windmill Cove (WC) | None | Updates from routine monitoring program-organization |
| Jun 16, 2023 | Stockton Rod and Gun Club (SJ) | None | Updates from routine monitoring program-organization |
| May 23, 2023 | San Joaquin River @ Buckley Cove | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| May 23, 2023 | San Joaquin River @ Potato Slough | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| Nov 14, 2022 | Stockton Turning Basin (R3) | None | Advisory based on visual and toxins |
| Nov 14, 2022 | Stockton Turning Basin (R3) | None | visual monitoring based advisory |
| Nov 14, 2022 | Stockton Turning Basin (R3) | None | visual monitoring based advisory |
| Sep 27, 2022 | Windmill Cove (WC) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 27, 2022 | Stockton Rod and Gun Club (SJ) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 16, 2022 | Stockton Rod and Gun Club (SJ) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 16, 2022 | Windmill Cove (WC) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 13, 2022 | Stockton Rod and Gun Club (SJ) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 13, 2022 | Windmill Cove (WC) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 8, 2022 | Dos Reis Regional Park | Caution | Floating/planktonic bloom observed; visual monitoring based advisory |
| Sep 1, 2022 | Mossdale Crossing Regional Park | Caution | Floating/planktonic bloom observed; visual monitoring based advisory |
| Aug 26, 2022 | Stockton Rod and Gun Club (SJ) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 26, 2022 | Windmill Cove (WC) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 24, 2022 | Stockton Rod and Gun Club (SJ) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 24, 2022 | Windmill Cove (WC) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 18, 2022 | Dos Reis Regional Park | Caution | Floating/planktonic bloom observed; Suspected bloom, investigation ongoing; Under investigation |
| Aug 17, 2022 | Stockton Rod and Gun Club (SJ) | Caution | Updates from routine monitoring program-organization |
| Aug 17, 2022 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization |
| Aug 9, 2022 | Dad's Point | Caution | visual monitoring based advisory |
| Aug 9, 2022 | Lost Isle, Acker Island | Caution | visual monitoring based advisory |
| Aug 9, 2022 | Stockton Rod and Gun Club (SJ) | Caution | Updates from routine monitoring program-organization |
| Aug 9, 2022 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization |
| Jul 29, 2022 | Stockton Rod and Gun Club (SJ) | Caution | Updates from routine monitoring program-organization |
| Jul 29, 2022 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization |
| Jul 25, 2022 | Stockton Rod and Gun Club (SJ) | Caution | |
| Jul 22, 2022 | East of Blind Pt (EZ2_SJR) | Caution | visual monitoring based advisory |
| Jul 22, 2022 | West of West Island (EZ6_SJR) | Caution | visual monitoring based advisory |
| Jul 22, 2022 | West of West Island (D12) | Caution | visual monitoring based advisory |
| Jul 15, 2022 | between Calaveras River and Buckley Cove (R4) | Caution | visual monitoring based advisory |
| Jul 15, 2022 | East End of Rough and Ready Island (R2) | Caution | visual monitoring based advisory |
| Jul 15, 2022 | Stockton Turning Basin (R3) | Caution | visual monitoring based advisory |
| Jul 15, 2022 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization |
| Jul 1, 2022 | Stockton Rod and Gun Club (SJ) | Caution | |
| Jul 1, 2022 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization |
| Jun 17, 2022 | Stockton Rod and Gun Club (SJ) | Caution | |
| Jun 17, 2022 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization |
| Jun 10, 2022 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization |
| Jun 10, 2022 | Stockton Rod and Gun Club (SJ) | Caution | |
| Jun 10, 2022 | Stockton Rod and Gun Club (SJ) | Caution | |
| Jun 3, 2022 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization |
| Jun 3, 2022 | Stockton Rod and Gun Club (SJ) | Caution | |
| May 27, 2022 | Stockton Rod and Gun Club (SJ) | Caution | |
| May 27, 2022 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization |
| May 19, 2022 | Stockton Rod and Gun Club (SJ) | Caution | |
| May 19, 2022 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization |
| May 12, 2022 | Stockton Rod and Gun Club (SJ) | Caution | |
| May 12, 2022 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization |
| May 11, 2022 | Stockton Rod and Gun Club (SJ) | Caution | |
| May 11, 2022 | Windmill Cove (WC) | Caution | Updates from routine monitoring program-organization |
| Jul 9, 2021 | at Buckley Cove North | Caution | Advisory based on visual and toxins |
| Oct 1, 2020 | San Joaquin River, at Potato Point | Caution | Advisory based on visual and toxins |
| Oct 1, 2020 | San Joaquin River, at Lost Isle | Caution | Advisory based on visual and toxins |
| Sep 30, 2020 | San Joaquin River, at Tinsley Island | Caution | Advisory based on visual and toxins |
| Aug 25, 2020 | San Joaquin River, at Buckley Cove | Caution | Advisory based on visual and toxins |
| Aug 25, 2020 | San Joaquin River at Louis Park | Danger | Advisory based on visual and toxins |
| Aug 25, 2020 | Port of Stockton | Danger | Advisory based on visual and toxins |
| Jul 10, 2020 | Port of Stockton, by I-5 bridge | Caution | visual monitoring based advisory |
| Aug 27, 2019 | Ward Island, San Joaquin River Stockton Delta Area | Caution | |
| Dec 4, 2018 | San Joaquin River at Tinsley Island | None | |
| Dec 4, 2018 | San Joaquin River above Dos Reis | None | |
| Sep 21, 2017 | San Joaquin River (Stockton Deep Water Ship Channel) | None | |
| Sep 21, 2017 | San Joaquin River (Stockton Deep Water Ship Channel) | None | |
| Sep 21, 2017 | San Joaquin River (Stockton Deep Water Ship Channel) | None | |
| Sep 21, 2017 | San Joaquin River (Stockton Deep Water Ship Channel) | None | |
| Sep 9, 2016 | San Joaquin River (Stockton Deep Water Ship Channel) | Caution |
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.