Kansas
Toxic algae in Ottawa County lakes
1 lake or waterway in Ottawa County has harmful algal bloom reports in Kansas's official data. The most recent entry is for Ottawa County State Fishing Lake: Kansas has a public health watch in effect for Ottawa County State Fishing Lake, last updated on 16 October 2026. The latest published sample, on 12 October 2026, was at Watch level (microcystin 2.13 µg/L, 100,241 cyanobacteria cells/mL).
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.