Ellis Lake: toxic algae advisories

Ellis Lake, Yuba County. See all Yuba County waters.

What the state's records say

Caution advisory, last posted Sep 24, 2026. 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: Algae that can make toxins may be present. Keep people, children and pets away from algae and scum, and do not let pets drink the water.

Before you go, check the state's official algae page and any signs posted at the water.

Dogs at Ellis Lake

The state has an advisory on file for Ellis Lake (Caution advisory), last posted Sep 24, 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.

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 Ellis Lake and its latest status
Spot	Status
Spot not described	Caution advisory, last posted Sep 24, 2026. No all-clear recorded.

Advisory history

Every advisory record the state has published for Ellis 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 Ellis Lake, newest first
Date	Spot	State's level	Notes
Sep 24, 2026	Spot not described	Caution	Lake-wide advisory; Suspected illness reported; visual monitoring based advisory
Sep 24, 2026	Spot not described	Caution	Suspected illness reported; visual monitoring based advisory
Sep 10, 2026	Spot not described	Caution	visual monitoring based advisory
Sep 4, 2026	Spot not described	NA - refer to Report Details

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.