Blue-Green Algae (BGA) Blooms


PUBLIC HEALTH ADVISORY LEVELS: KDHE may issue two levels of public health protection notifications: a Public Health Watch or Public Health Warning. These notification levels are determined by the concentration of a harmful toxin(s) or the concentration of cyanobacteria cell counts.

Public Health Watch–

  • Notifies public that a hazardous condition may exist
  • Signs may be posted at all public access locations
  • Water may be unsafe for humans/animals
  • Discourage water contact

Public Health Warning–

  • Notifies public that conditions are unsafe
  • Signs will be posted at all public access locations
  • Water contact should not occur
  • All conditions of Public Health Watch remain in effect


Watches Sign

  • Lake Scott State Park
  • Overbrook City Lake, Osage County
  • Veteran's Lake (Ark City), Cowley County

Warning Sign

  • Brown County State Fishing Lake, Brown County
  • Central Park Lake, Shawnee County
  • Hiawatha City Lake, Brown County
  • Melvern Outlet Pond, Osage County
  • Melvern Outlet Swim Pond, Osage County
  • Sam's Pond, Syracuse, Hamilton County
  • South Lake, Johnson County
  • Webster Lake, Rooks County

Closure Sign

  • Hodgeman County State Fishing Lake, Hodgeman County

Zoned Lakes: Milford, Tuttle Creek and Perry Reservoirs

Some Kansas lakes and reservoirs meet size, depth and shoreline criteria that make it necessary to implement lake zones to more accurately reflect what portions of a specific water body are affected by blue-green algae blooms. Lake Perry, Milford Reservoir, and Tuttle Creek Lake met all of the criteria for zoning. Zones for the three lakes were determined in consultation with the US Army Corp of Engineers. Milford Reservoir and Tuttle Creek Lake each have three zones while Lake Perry has four.

A map containing all public lakes and their current status by zone, where applicable, can be viewed here.


To Report an Algal Bloom use the
report form on the menu or call

785-296-1664