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

  • Mary's Lake, Douglas County
  • Overbrook City Lake, Osage County
  • Perry Lake Zone A, in Jefferson County (the southern portion of the main body, south of the Longview Campground)
  • Perry Lake Zone B, in Jefferson County (the Slough Creek Arm)
  • Rock Garden Pond, Gage Park, Shawnee County

Warning Sign

  • Atchison County Park Lake, Atchison County
  • Carbondale West Lake, Osage County
  • Frazier Lake, Grant County
  • Hodgeman County SFL, Hodgeman County
  • Jerry Ivey Pond, Saline County
  • Lake Afton, Sedgwick County
  • Lake Scott State Park Lake, in Scott County
  • Lake Wabaunsee, Wabaunsee County
  • Melvern Outlet Pond, Osage County
  • Melvern Outlet Swim Pond, Osage County, Closure – Visitor's can utilize Coeur d' Alene Park Swim Beach which sets on the main body of the lake, located west of the U.S. Army Corps. Of Engineers Project Office. The present algae bloom is isolated to the Outlet Pond and Outlet Swim Pond; Melvern Lake is not affected.
  • Marais Des Cygnes Wildlife Area Lake, Linn County
  • South Park Lake, Johnson County
  • Webster Lake, Rooks County, with Beach Closure

Closure Sign

  • Lakewood Park Lake, in Saline 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