photo by: Shawn Valverde

Clinton Lake is pictured on Friday, July 17, 2026.

The Kansas Department of Health and Environment has lifted its blue-green algae health advisory for Clinton Lake.

Advisories are lifted when cell densities and toxin concentrations dissipate to levels below the “Watch” thresholds.

Clinton Lake was added to the Watch list in June and was elevated to the more serious Warning list about a week ago. The Watch designation means precautions should be exercised in case the toxic algae is present. The Warning list indicates that blue-green algae is actually expected or present.

KDHE monitors bodies of water in the state for algae blooms during the water recreation season, which runs from April 1 to Oct. 31, and issues health advisories as warranted.

Blue-green algae is a toxin that is harmful to humans and pets. Symptoms vary depending upon the type of exposure but can include rash, vomiting, diarrhea, fever, sore throat and headache.

An algae bloom may look like foam, scum or paint floating on the water and be colored blue, bright green, brown or red. Blooms can develop rapidly; if the water appears suspicious or there is decaying algae on the shore, KDHE says to avoid contact and keep dogs away. 

Suspected algae-related health incidents, whether human or animal, regardless of season, should be reported as soon as possible at kdhe.ks.gov/1163.