Kansas
Toxic algae in Osage County lakes
8 lakes and waterways in Osage County have harmful algal bloom reports in Kansas's official data. The most recent entry is for Melvern Outlet Pond: Kansas has a public health watch in effect for Melvern Outlet Pond, last updated on 16 October 2026. The latest published sample, on 13 October 2026, was below advisory levels (microcystin 0.51 µg/L). Melvern Outlet Pond, Strowbridge Reservoir and Melvern Outlet Swim Pond and 3 more 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.
- Melvern Outlet Pond Public health watch
- Strowbridge Reservoir No current advisory
- Melvern Outlet Swim Pond No current advisory
- Pomona Lake No current advisory
- Overbrook City Lake No current advisory
- Melvern Lake No current advisory
- Overbrook City Kids Pond No current advisory
- Carbondale West Lake 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.