Kansas

Toxic algae in Atchison County lakes

4 lakes and waterways in Atchison County have harmful algal bloom reports in Kansas's official data. The most recent entry is for Atchison County Park Lake: Kansas has no current advisory for Atchison County Park Lake. The most recent sample, on 27 October 2025, was at Watch level (microcystin not detected, 240,548 cyanobacteria cells/mL). Atchison County Park Lake, Atchison County State Fishing Lake and Lake Warnock have 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.

Atchison County Park Lake Latest 27 October 2025, blooms in 5 years No current advisory
Atchison City Lake Latest 27 October 2025, blooms in 2 years No current advisory
Atchison County State Fishing Lake Latest 6 October 2025, blooms in 4 years No current advisory
Lake Warnock Latest 22 September 2025, blooms in 5 years No current advisory

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.