Kansas

Toxic algae in Neosho County lakes

5 lakes and waterways in Neosho County have harmful algal bloom reports in Kansas's official data. The most recent entry is for Parsons Lake: Kansas has no current advisory for Parsons Lake. The most recent sample, on 3 August 2026, was below advisory levels (microcystin 0.34 µg/L, 51,211 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.

Parsons Lake Latest 3 August 2026, blooms in 2 years No current advisory
Thayer Old City Lake Latest 20 July 2026, blooms in 1 year No current advisory
Thayer New City Lake Latest 20 July 2026, blooms in 0 years No current advisory
Neosho County State Fishing Lake Latest 25 October 2021, blooms in 2 years No current advisory

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.

Elks Lake 2014

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.