Which Kansas counties have the highest radon?

EPA zone 1 counties in Kansas: Atchison County, Barton County, Brown County, Cheyenne County, Clay County, Cloud County, Decatur County, Dickinson County, Douglas County, Ellis County, Ellsworth County, Finney County, Ford County, Geary County, Gove County, Graham County, Grant County, Gray County, Greeley County, Hamilton County, Haskell County, Hodgeman County, Jackson County, Jewell County, Johnson County and 40 more.

EPA radon zones

Kansas radon map: every county's zone

65 of Kansas's 105 counties are EPA radon zone 1 (predicted average above 4 pCi/L), 40 are zone 2 and 0 are zone 3. High readings occur in every zone, so EPA recommends testing every home.

Allen CountyZone 2

Anderson CountyZone 2

Atchison CountyZone 1

Barber CountyZone 2

Barton CountyZone 1

Bourbon CountyZone 2

Brown CountyZone 1

Butler CountyZone 2

Chase CountyZone 2

Chautauqua CountyZone 2

Cherokee CountyZone 2

Cheyenne CountyZone 1

Clark CountyZone 2

Clay CountyZone 1

Cloud CountyZone 1

Coffey CountyZone 2

Comanche CountyZone 2

Cowley CountyZone 2

Crawford CountyZone 2

Decatur CountyZone 1

Dickinson CountyZone 1

Doniphan CountyZone 2

Douglas CountyZone 1

Edwards CountyZone 2

Elk CountyZone 2

Ellis CountyZone 1

Ellsworth CountyZone 1

Finney CountyZone 1

Ford CountyZone 1

Franklin CountyZone 2

Geary CountyZone 1

Gove CountyZone 1

Graham CountyZone 1

Grant CountyZone 1

Gray CountyZone 1

Greeley CountyZone 1

Greenwood CountyZone 2

Hamilton CountyZone 1

Harper CountyZone 2

Harvey CountyZone 2

Haskell CountyZone 1

Hodgeman CountyZone 1

Jackson CountyZone 1

Jefferson CountyZone 2

Jewell CountyZone 1

Johnson CountyZone 1

Kearny CountyZone 1

Kingman CountyZone 1

Kiowa CountyZone 1

Labette CountyZone 2

Lane CountyZone 1

Leavenworth CountyZone 1

Lincoln CountyZone 1

Linn CountyZone 2

Logan CountyZone 1

Lyon CountyZone 2

Marion CountyZone 1

Marshall CountyZone 1

McPherson CountyZone 1

Meade CountyZone 1

Miami CountyZone 2

Mitchell CountyZone 1

Montgomery CountyZone 2

Morris CountyZone 2

Morton CountyZone 2

Nemaha CountyZone 1

Neosho CountyZone 2

Ness CountyZone 1

Norton CountyZone 1

Osage CountyZone 2

Osborne CountyZone 1

Ottawa CountyZone 1

Pawnee CountyZone 1

Phillips CountyZone 1

Pottawatomie CountyZone 1

Pratt CountyZone 1

Rawlins CountyZone 1

Reno CountyZone 2

Republic CountyZone 1

Rice CountyZone 1

Riley CountyZone 1

Rooks CountyZone 1

Rush CountyZone 1

Russell CountyZone 1

Saline CountyZone 1

Scott CountyZone 1

Sedgwick CountyZone 2

Seward CountyZone 2

Shawnee CountyZone 2

Sheridan CountyZone 1

Sherman CountyZone 1

Smith CountyZone 1

Stafford CountyZone 2

Stanton CountyZone 1

Stevens CountyZone 2

Sumner CountyZone 2

Thomas CountyZone 1

Trego CountyZone 1

Wabaunsee CountyZone 2

Wallace CountyZone 1

Washington CountyZone 1

Wichita CountyZone 1

Wilson CountyZone 2

Woodson CountyZone 2

Wyandotte CountyZone 1

How much does radon mitigation cost?

Most single-family systems cost $800 to $2,500 installed, depending on foundation type and how many suction points are needed. A follow-up test confirms the system works.

What do the zones mean?

EPA radon zones describe counties, not houses. Zone 1 counties have a predicted average indoor level above 4 picocuries per liter (pCi/L), Zone 2 between 2 and 4, Zone 3 below 2. Homes with high levels are found in every zone, which is why EPA recommends that every home be tested, and fixed at 4 pCi/L or above.

Kansas cities: water and radon

Source: EPA Map of Radon Zones.