Arroyo Seco: toxic algae advisories

Arroyo Seco, Los Angeles County. See all Los Angeles County waters.

What the state's records say

Reports on file, with no advisory level the state has classified.

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 Arroyo Seco

The state has reports on file for Arroyo Seco but has not classified an advisory level, so the records cannot answer this. Keep your dog out of discolored or scummy water.

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 Arroyo Seco and its latest status
Spot	Status
Jet Propulsion Laboratory NASA	Reports on file, with no advisory level the state has classified.

Advisory history

Every advisory record the state has published for Arroyo Seco, 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 Arroyo Seco, newest first
Date	Spot	State's level	Notes
Jun 30, 2023	Jet Propulsion Laboratory NASA	NA - refer to Report Details	No cyano, other algae present.

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.