Kansas
Toxic algae in Brown County lakes
4 lakes and waterways in Brown County have harmful algal bloom reports in Kansas's official data. The most recent entry is for Hiawatha City Lake: Kansas has no current advisory for Hiawatha City Lake. The most recent sample, on 21 September 2026, was below advisory levels (microcystin not detected, 53,118 cyanobacteria cells/mL). Hiawatha City Lake, Mission Lake and Brown County State Fishing Lake 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.
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.