North Natomas Retention Basin: toxic algae advisories
North Natomas Retention Basin, Sacramento County. See all Sacramento County waters.
What the state's records say
The state's latest record, from Sep 12, 2025, recommends no advisory.
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 North Natomas Retention Basin
The state's latest record, from Sep 12, 2025, recommends no advisory. For North Natomas Retention Basin, 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 |
|---|---|
| Heritage Park near Elkhorn Blvd. and Natomas Blvd. | The state's latest record, from Sep 12, 2025, recommends no advisory. |
Advisory history
Every advisory record the state has published for North Natomas Retention Basin, 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 |
|---|---|---|---|
| Sep 12, 2025 | Heritage Park near Elkhorn Blvd. and Natomas Blvd. | None | 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.