Kansas
Toxic algae in Jefferson County lakes
1 lake or waterway in Jefferson County has harmful algal bloom reports in Kansas's official data. The most recent entry is for Perry Lake: Kansas has no current advisory for Perry Lake. The most recent sample, on 6 July 2021 at Perry State Park Beach, was below advisory levels (microcystin 0.43 µg/L, 42,786 cyanobacteria cells/mL). Perry Lake has had blooms in three or more years.
Lakes with bloom history
Newest report first. Each lake has its own page with the full history and what the results mean.
Source: Kansas Department of Health and Environment (KDHE), official data, checked 24 October 2026. For today's conditions see the KDHE algae bloom map. No report doesn't mean a lake is safe: most water is only tested occasionally.