Mission Bay: toxic algae advisories
Mission Bay, San Diego County. See all San Diego County waters.
What the state's records say
The state's latest record, from Oct 13, 2026, recommends no advisory.
Last advisory on file: May 18, 2026.
That reflects what the state knew on that date. It is not a finding that the water is safe now: blooms can return within days, and many are never reported.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at Mission Bay
The state's latest record, from Oct 13, 2026, recommends no advisory. For Mission Bay, that is not the same as an all-clear for today. Look at the water before your dog goes in: keep it out of green, blue-green or scummy water and away from mats on the shore.
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 |
|---|---|
| Mission Point | The state's latest record, from Oct 13, 2026, recommends no advisory. |
| south of Kendall Frost Preserve at the fence line | The state's latest record, from Dec 7, 2022, recommends no advisory. |
| southern shore at the boat launch | The state's latest record, from Dec 7, 2022, recommends no advisory. |
Advisory history
Every advisory record the state has published for Mission Bay, 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 13, 2026 | Mission Point | None | Advisory based on visual and toxins |
| Sep 3, 2026 | Mission Point | None | Advisory based on visual and toxins |
| Jun 26, 2026 | Mission Point | None | Advisory based on visual and toxins |
| May 18, 2026 | Mission Point | Caution | Advisory based on visual and toxins |
| May 11, 2026 | Mission Point | Blank in the state's file | Under investigation |
| Dec 7, 2022 | south of Kendall Frost Preserve at the fence line | None | End date recorded: Dec 30, 2022. Marine bloom present (red tide) |
| Dec 7, 2022 | south of Kendall Frost Preserve at the fence line | None | Marine bloom present (red tide) |
| Dec 7, 2022 | southern shore at the boat launch | None | Marine bloom present (red tide) |
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.