Kansas
Toxic algae in Shawnee County lakes
7 lakes and waterways in Shawnee County have harmful algal bloom reports in Kansas's official data. The most recent entry is for Lake Shawnee: Kansas has no current advisory for Lake Shawnee. The most recent sample, on 1 September 2026, was below advisory levels (microcystin not detected, 59,733 cyanobacteria cells/mL). Lake Shawnee, Rock Garden Pond and Central Park 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.
Other waterbodies with a report
These have one or two reports in a single year, which isn't enough history for a page of their own yet.
- Cedar Crest Lake 2011
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.