Kumeyaay Lake: toxic algae advisories

Kumeyaay Lake, San Diego County. See all San Diego County waters.

What the state's records say

The state's latest record, from Oct 21, 2025, recommends no advisory.

Last advisory on file: Aug 27, 2025.

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 Kumeyaay Lake

The state's latest record, from Oct 21, 2025, recommends no advisory. For Kumeyaay Lake, 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:

Each reported spot at Kumeyaay Lake and its latest status
Spot	Status
Kumeyaay Lake Campground	The state's latest record, from Oct 21, 2025, recommends no advisory.
Spot not described	The state's latest record, from Sep 15, 2021, recommends no advisory.

Advisory history

Every advisory record the state has published for Kumeyaay Lake, newest first. "None" is the state's record that no advisory was recommended on that date. "NA" records do not change a status.

Advisory records for Kumeyaay Lake, newest first
Date	Spot	State's level	Notes
Oct 21, 2025	Kumeyaay Lake Campground	None	Testing results below posting triggers
Aug 27, 2025	Kumeyaay Lake Campground	Caution	visual monitoring based advisory; Visual monitoring only-present bloom
Sep 15, 2021	Spot not described	None	Testing results below posting triggers

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.