Big Bear Lake: toxic algae advisories
Big Bear Lake, San Bernardino County. See all San Bernardino County waters.
What the state's records say
Danger advisory, last posted Aug 28, 2026. No all-clear recorded.
42 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 Big Bear Lake
The state has an advisory on file for Big Bear Lake (Danger advisory), last posted Aug 28, 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.
Satellite estimate (not an advisory)
Week ending Oct 17, 2026: about 940,000 cells/mL of cyanobacteria near the center of Big Bear Lake.
A satellite estimate from EPA CyAN for a 10.9 km² lake. It does not measure toxins and does not change the advisory status.
| Week ending | Estimate |
|---|---|
| Oct 17, 2026 | about 940,000 cells/mL |
| Oct 10, 2026 | about 2,600,000 cells/mL |
| Oct 3, 2026 | about 2,600,000 cells/mL |
| Sep 26, 2026 | about 2,500,000 cells/mL |
| Sep 19, 2026 | about 2,000,000 cells/mL |
| Sep 12, 2026 | about 2,500,000 cells/mL |
| Sep 5, 2026 | about 1,600,000 cells/mL |
| Aug 29, 2026 | about 1,900,000 cells/mL |
This is a satellite estimate from the U.S. EPA's Cyanobacteria Assessment Network, not an advisory. It estimates how much cyanobacteria is in the water near the lake's center, not whether toxins are present: a high number does not mean toxins, and a low one does not mean there are none. It covers lakes of about 1 square kilometer and larger, so small ponds, dog parks and most rivers are not covered, and clouds can hide a lake for weeks. It never changes the advisory status above.
Satellite estimates: U.S. EPA Cyanobacteria Assessment Network (CyAN), from Copernicus Sentinel-3 data. Provisional, research-level estimates; EPA does not endorse this site. Checked Oct 22, 2026.
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 |
|---|---|
| Big Bear Lake, Pine Oak Lane North Beach (801BBL678) | Warning advisory, last posted Aug 28, 2026. No all-clear recorded. |
| Boulder Bay (801BBL671) | Warning advisory, last posted Aug 28, 2026. No all-clear recorded. |
| Big Bear Lake, Stanfield cutoff northern end (801BBL673) | Warning advisory, last posted Aug 28, 2026. No all-clear recorded. |
| Carol Morrison dock (East Ramp)-801BBL705 | Warning advisory, last posted Nov 6, 2025. No all-clear recorded. |
| Big Bear at Lagonita Point | Caution advisory, last posted Aug 4, 2023. No all-clear recorded. |
| Dam Near MWDL1 | Reports on file, with no advisory level the state has classified. |
| Gilner Point Middle near MWDL2-801BBL701 | Caution advisory, last posted Dec 2, 2022. No all-clear recorded. |
| Mid Lake near MWDL6-801BBL702 | Caution advisory, last posted Dec 2, 2022. No all-clear recorded. |
| Stanfield Middle near MWDL9-801BBL703 | Caution advisory, last posted Dec 2, 2022. No all-clear recorded. |
| Big Bear Marina--801BBL704 | Caution advisory, last posted Dec 2, 2022. No all-clear recorded. |
| Duane Boyer Dock (West Ramp)-801BBL706 | Caution advisory, last posted Dec 2, 2022. No all-clear recorded. |
| Duane Boyer Dock (West Ramp)-801BBL706 | Caution advisory, last posted Dec 2, 2022. No all-clear recorded. |
| Carol Morrison dock (East Ramp)-801BBL705 | Caution advisory, last posted Dec 2, 2022. No all-clear recorded. |
| Big Bear Marina--801BBL704 | Caution advisory, last posted Dec 2, 2022. No all-clear recorded. |
| Stanfield Middle near MWDL9-801BBL703 | Caution advisory, last posted Dec 2, 2022. No all-clear recorded. |
| Mid Lake near MWDL6-801BBL702 | Caution advisory, last posted Dec 2, 2022. No all-clear recorded. |
| Gilner Point Middle near MWDL2-801BBL701 | Caution advisory, last posted Dec 2, 2022. No all-clear recorded. |
| Dam Near MWDL1 | Caution advisory, last posted Dec 2, 2022. No all-clear recorded. |
| Big Bear Lake-Stanfield Cutoff | Caution advisory, last posted Jun 24, 2022. No all-clear recorded. |
| Big Bear Lake-Mid Lake near MWDLG | The state's latest record, from Jun 24, 2022, recommends no advisory. |
| Big Bear Lake North Shore | The state's latest record, from Jun 24, 2022, recommends no advisory. |
| Stanfield Middle near MWDL9-801BBL703 | Caution advisory, last posted Jul 2, 2021. No all-clear recorded. |
| Mid Lake near MWDL6- 801BBL702 | Caution advisory, last posted Jul 2, 2021. No all-clear recorded. |
| Duane Boyer Dock-801BBL706 | Caution advisory, last posted Jul 2, 2021. No all-clear recorded. |
| Carol Morrison Dock-801BBL705 | Caution advisory, last posted Jul 2, 2021. No all-clear recorded. |
| Big Bear Marina-801BBL704 | Caution advisory, last posted Jul 2, 2021. No all-clear recorded. |
| Gilner Point Middle near MWDL2 | Caution advisory, last posted Jul 2, 2021. No all-clear recorded. |
| Boyer Public Launch Ramp | Caution advisory, last posted Jul 2, 2021. No all-clear recorded. |
| Stanfield Cutoff | Caution advisory, last posted Jul 2, 2021. No all-clear recorded. |
| Pine Knot Marina | The state's latest record, from Mar 5, 2021, recommends no advisory. |
| Big Bear Lake-Eagle Point | Caution advisory, last posted Nov 6, 2020. No all-clear recorded. |
| Big Bear Lake, Carol Morrison boat ramp | Caution advisory, last posted Nov 6, 2020. No all-clear recorded. |
| Big Bear Lake-Solar Observatory Eastside | Caution advisory, last posted Nov 6, 2020. No all-clear recorded. |
| Big Bear Lake, near Stanfield Cutoff | Danger advisory, last posted Oct 21, 2020. No all-clear recorded. |
| Big Bear Lake, at Garstin Island (Treasure Island) | Danger advisory, last posted Oct 21, 2020. No all-clear recorded. |
| Big Bear Lake, at North Shore Drive (Pipeline) | Warning advisory, last posted Oct 21, 2020. No all-clear recorded. |
| Big Bear Lake, at Mallard Lagoon | Caution advisory, last posted Oct 21, 2020. No all-clear recorded. |
| Big Bear Lake, at Duane Boyer Boat Launch | Caution advisory, last posted Oct 21, 2020. No all-clear recorded. |
| Limno Marker 6 | Caution advisory, last posted Aug 28, 2020. No all-clear recorded. |
| Limno Marker 9 | Caution advisory, last posted Aug 28, 2020. No all-clear recorded. |
| Carol Morrison | Caution advisory, last posted Aug 28, 2020. No all-clear recorded. |
| Pine Oak North Beach | Caution advisory, last posted Aug 28, 2020. No all-clear recorded. |
| Big Bear Lake-Boulder Bay | Caution advisory, last posted Aug 28, 2020. No all-clear recorded. |
| Big Bear Lake - Ski Beach Park | Caution advisory, last posted Aug 14, 2020. No all-clear recorded. |
| Big Bear Lake, near North Shore Landing | Caution advisory, last posted Aug 14, 2020. No all-clear recorded. |
| Big Bear lake - Metcalf Bay | Caution advisory, last posted Aug 14, 2020. No all-clear recorded. |
Advisory history
Every advisory record the state has published for Big Bear 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 28, 2026 | Big Bear Lake, Pine Oak Lane North Beach (801BBL678) | Warning | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 28, 2026 | Boulder Bay (801BBL671) | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 28, 2026 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 3, 2026 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 3, 2026 | Boulder Bay (801BBL671) | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 3, 2026 | Big Bear Lake, Pine Oak Lane North Beach (801BBL678) | None | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| May 12, 2026 | Big Bear Lake, Pine Oak Lane North Beach (801BBL678) | General awareness | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| May 12, 2026 | Boulder Bay (801BBL671) | General awareness | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 12, 2026 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | General awareness | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 12, 2026 | Boulder Bay (801BBL671) | General awareness | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 12, 2026 | Big Bear Lake, Pine Oak Lane North Beach (801BBL678) | General awareness | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 6, 2025 | Carol Morrison dock (East Ramp)-801BBL705 | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 6, 2025 | Boulder Bay (801BBL671) | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 6, 2025 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 6, 2025 | Big Bear Lake, Pine Oak Lane North Beach (801BBL678) | Warning | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 6, 2025 | Big Bear Lake, Pine Oak Lane North Beach (801BBL678) | Danger | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 6, 2025 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | Caution | Updates from routine monitoring program-organization |
| Aug 26, 2025 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | None | Updates from routine monitoring program-organization |
| Aug 26, 2025 | Boulder Bay (801BBL671) | None | Updates from routine monitoring program-organization |
| Jun 27, 2025 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | None | Updates from routine monitoring program-organization |
| Jun 27, 2025 | Boulder Bay (801BBL671) | None | Updates from routine monitoring program-organization |
| May 16, 2025 | Boulder Bay (801BBL671) | None | Updates from routine monitoring program-organization |
| May 16, 2025 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | None | Updates from routine monitoring program-organization |
| Nov 27, 2024 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | None | Updates from routine monitoring program-organization |
| Nov 27, 2024 | Boulder Bay (801BBL671) | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 27, 2024 | Boulder Bay (801BBL671) | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 27, 2024 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | Caution | Updates from routine monitoring program-organization |
| Aug 27, 2024 | Boulder Bay (801BBL671) | Danger | Alert-scum observed; Updates from routine monitoring program-organization |
| Jun 28, 2024 | Boulder Bay (801BBL671) | None | Updates from routine monitoring program-organization |
| Jun 28, 2024 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | None | Updates from routine monitoring program-organization |
| May 20, 2024 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | None | Updates from routine monitoring program-organization |
| Aug 24, 2023 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 24, 2023 | Big Bear Lake, Pine Oak Lane North Beach (801BBL678) | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 4, 2023 | Big Bear at Lagonita Point | Caution | Advisory based on visual and toxins |
| Jun 20, 2023 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 20, 2023 | Big Bear Lake, Pine Oak Lane North Beach (801BBL678) | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| May 24, 2023 | Big Bear Lake, Stanfield cutoff northern end (801BBL673) | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| May 24, 2023 | Big Bear Lake, Pine Oak Lane North Beach (801BBL678) | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 2, 2022 | Dam Near MWDL1 | Blank in the state's file | Updates from routine monitoring program-organization |
| Dec 2, 2022 | Gilner Point Middle near MWDL2-801BBL701 | Caution | Updates from routine monitoring program-organization |
| Dec 2, 2022 | Mid Lake near MWDL6-801BBL702 | Caution | Updates from routine monitoring program-organization |
| Dec 2, 2022 | Stanfield Middle near MWDL9-801BBL703 | Caution | Updates from routine monitoring program-organization |
| Dec 2, 2022 | Big Bear Marina--801BBL704 | Caution | Updates from routine monitoring program-organization |
| Dec 2, 2022 | Carol Morrison dock (East Ramp)-801BBL705 | Caution | Updates from routine monitoring program-organization |
| Dec 2, 2022 | Duane Boyer Dock (West Ramp)-801BBL706 | Caution | Updates from routine monitoring program-organization |
| Dec 2, 2022 | Duane Boyer Dock (West Ramp)-801BBL706 | Caution | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 2, 2022 | Carol Morrison dock (East Ramp)-801BBL705 | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 2, 2022 | Big Bear Marina--801BBL704 | Caution | Advisory based on visual and toxins; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 2, 2022 | Stanfield Middle near MWDL9-801BBL703 | Caution | Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 2, 2022 | Mid Lake near MWDL6-801BBL702 | Caution | Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 2, 2022 | Gilner Point Middle near MWDL2-801BBL701 | Caution | Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 2, 2022 | Dam Near MWDL1 | Caution | Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 2, 2022 | Dam Near MWDL1 | Caution | Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Dec 2, 2022 | Dam Near MWDL1 | Caution | Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 2, 2022 | Duane Boyer Dock (West Ramp)-801BBL706 | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 2, 2022 | Carol Morrison dock (East Ramp)-801BBL705 | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 2, 2022 | Big Bear Marina--801BBL704 | Caution | Advisory based on visual and toxins; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 2, 2022 | Stanfield Middle near MWDL9-801BBL703 | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 2, 2022 | Mid Lake near MWDL6-801BBL702 | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 2, 2022 | Gilner Point Middle near MWDL2-801BBL701 | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 2, 2022 | Dam Near MWDL1 | Caution | Advisory based on visual and toxins; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2022 | Duane Boyer Dock (West Ramp)-801BBL706 | Caution | Advisory based on visual and toxins; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2022 | Gilner Point Middle near MWDL2-801BBL701 | Caution | Advisory based on visual and toxins; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2022 | Mid Lake near MWDL6-801BBL702 | Caution | Advisory due to historical data.; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2022 | Stanfield Middle near MWDL9-801BBL703 | Caution | Advisory based on visual and toxins; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2022 | Big Bear Marina--801BBL704 | Caution | Advisory based on visual and toxins; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2022 | Carol Morrison dock (East Ramp)-801BBL705 | Caution | Advisory based on visual and toxins; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2022 | Big Bear Marina--801BBL704 | Danger | Advisory based on visual and toxins; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2022 | Stanfield Middle near MWDL9-801BBL703 | Danger | Advisory based on visual and toxins; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2022 | Mid Lake near MWDL6-801BBL702 | Danger | Advisory due to historical data.; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2022 | Gilner Point Middle near MWDL2-801BBL701 | Danger | Advisory based on visual and toxins; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 10, 2022 | Dam Near MWDL1 | Caution | Advisory based on visual and toxins; Bottom/benthic bloom observed; Floating/planktonic bloom observed; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 16, 2022 | Duane Boyer Dock (West Ramp)-801BBL706 | Danger | Lake-wide advisory |
| Aug 16, 2022 | Carol Morrison dock (East Ramp)-801BBL705 | Danger | Lake-wide advisory |
| Aug 16, 2022 | Carol Morrison dock (East Ramp)-801BBL705 | Danger | Lake-wide advisory |
| Aug 16, 2022 | Big Bear Marina--801BBL704 | Danger | Lake-wide advisory |
| Aug 16, 2022 | Mid Lake near MWDL6-801BBL702 | Danger | Lake-wide advisory |
| Aug 16, 2022 | Stanfield Middle near MWDL9-801BBL703 | Danger | Lake-wide advisory |
| Aug 16, 2022 | Mid Lake near MWDL6-801BBL702 | Danger | Lake-wide advisory |
| Aug 16, 2022 | Gilner Point Middle near MWDL2-801BBL701 | Danger | Lake-wide advisory |
| Aug 16, 2022 | Dam Near MWDL1 | Danger | Lake-wide advisory |
| Aug 3, 2022 | Duane Boyer Dock (West Ramp)-801BBL706 | Warning | Lake-wide advisory |
| Aug 3, 2022 | Carol Morrison dock (East Ramp)-801BBL705 | Danger | Advisory based on visual and toxins |
| Aug 3, 2022 | Big Bear Marina--801BBL704 | Warning | Lake-wide advisory |
| Aug 3, 2022 | Stanfield Middle near MWDL9-801BBL703 | Warning | Lake-wide advisory |
| Aug 3, 2022 | Mid Lake near MWDL6-801BBL702 | Warning | Lake-wide advisory |
| Aug 3, 2022 | Gilner Point Middle near MWDL2-801BBL701 | Warning | Lake-wide advisory |
| Aug 3, 2022 | Dam Near MWDL1 | Warning | Lake-wide advisory |
| Jul 11, 2022 | Duane Boyer Dock (West Ramp)-801BBL706 | Caution | Lake-wide advisory |
| Jul 11, 2022 | Carol Morrison dock (East Ramp)-801BBL705 | Caution | Lake-wide advisory |
| Jul 11, 2022 | Big Bear Marina--801BBL704 | Caution | Lake-wide advisory |
| Jul 11, 2022 | Stanfield Middle near MWDL9-801BBL703 | Caution | Lake-wide advisory |
| Jul 11, 2022 | Gilner Point Middle near MWDL2-801BBL701 | Caution | Lake-wide advisory |
| Jul 11, 2022 | Mid Lake near MWDL6-801BBL702 | Caution | Lake-wide advisory |
| Jul 11, 2022 | Gilner Point Middle near MWDL2-801BBL701 | Blank in the state's file | |
| Jul 11, 2022 | Dam Near MWDL1 | Caution | Lake-wide advisory |
| Jun 24, 2022 | Big Bear Lake-Stanfield Cutoff | Caution | Advisory based on visual and toxins |
| Jun 24, 2022 | Big Bear Lake-Mid Lake near MWDLG | None | No cyano bloom w/testing |
| Jun 24, 2022 | Big Bear Lake North Shore | None | No cyano bloom w/testing |
| May 20, 2022 | Big Bear Lake-Stanfield Cutoff | None | No cyano bloom w/testing |
| May 20, 2022 | Big Bear Lake-Mid Lake near MWDLG | None | No cyano bloom w/testing |
| May 20, 2022 | Big Bear Lake North Shore | None | No cyano bloom w/testing |
| May 19, 2022 | Big Bear Lake-Stanfield Cutoff | None | No cyano bloom w/testing |
| May 19, 2022 | Big Bear Lake-Mid Lake near MWDLG | None | No cyano bloom w/testing |
| Jul 2, 2021 | Stanfield Middle near MWDL9-801BBL703 | Caution | Advisory based on visual and toxins |
| Jul 2, 2021 | Mid Lake near MWDL6- 801BBL702 | Caution | Advisory based on visual and toxins |
| Jul 2, 2021 | Duane Boyer Dock-801BBL706 | Caution | Advisory based on visual and toxins |
| Jul 2, 2021 | Carol Morrison Dock-801BBL705 | Caution | Advisory based on visual and toxins |
| Jul 2, 2021 | Big Bear Marina-801BBL704 | Caution | Advisory based on visual and toxins |
| Jul 2, 2021 | Gilner Point Middle near MWDL2 | Caution | Advisory based on visual and toxins |
| Jul 2, 2021 | Boyer Public Launch Ramp | Caution | Advisory based on visual and toxins |
| Jul 2, 2021 | Stanfield Cutoff | Caution | Advisory based on visual and toxins |
| Mar 5, 2021 | Pine Knot Marina | None | Testing results below posting triggers |
| Nov 6, 2020 | Big Bear Lake-Eagle Point | Caution | Lake-wide advisory |
| Nov 6, 2020 | Big Bear Lake, Carol Morrison boat ramp | Caution | Lake-wide advisory |
| Nov 6, 2020 | Big Bear Lake-Solar Observatory Eastside | Caution | Lake-wide advisory |
| Oct 21, 2020 | Big Bear Lake, near Stanfield Cutoff | Danger | Advisory based on visual and toxins |
| Oct 21, 2020 | Big Bear Lake, at Garstin Island (Treasure Island) | Danger | Advisory based on visual and toxins |
| Oct 21, 2020 | Big Bear Lake, at North Shore Drive (Pipeline) | Warning | Advisory based on visual and toxins |
| Oct 21, 2020 | Big Bear Lake, at Mallard Lagoon | Caution | Lake-wide advisory |
| Oct 21, 2020 | Big Bear Lake, at Duane Boyer Boat Launch | Caution | Lake-wide advisory |
| Aug 28, 2020 | Limno Marker 6 | Caution | Lake-wide advisory |
| Aug 28, 2020 | Limno Marker 9 | Caution | Advisory based on visual and toxins |
| Aug 28, 2020 | Carol Morrison | Caution | Lake-wide advisory |
| Aug 28, 2020 | Pine Oak North Beach | Caution | Lake-wide advisory |
| Aug 28, 2020 | Big Bear Lake-Boulder Bay | Caution | Lake-wide advisory |
| Aug 14, 2020 | Big Bear Lake - Ski Beach Park | Caution | Lake-wide advisory |
| Aug 14, 2020 | Big Bear Lake, near North Shore Landing | Caution | Lake-wide advisory |
| Aug 14, 2020 | Big Bear lake - Metcalf Bay | Caution | Lake-wide 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.