Kansas
Toxic algae in Wyandotte County lakes
5 lakes and waterways in Wyandotte County have harmful algal bloom reports in Kansas's official data. The most recent entry is for Big Eleven Lake: Kansas has no current advisory for Big Eleven Lake. The most recent sample, on 28 October 2024, was at Watch level (microcystin 0.18 µg/L, 144,368 cyanobacteria cells/mL). Big Eleven 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.
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.
- Lake Of The Forest 2011
- North Park Lake 2023
- Pierson Park Lake 2024
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.