Nebraska: 93 counties covered
Of 93 rated Nebraska counties, 53 are in EPA's highest radon-potential zone (Zone 1) — but every county page links to testing guidance regardless of zone, because a county rating is a county-wide average, not a reading for any one house.
- Douglas County
- Lancaster County
- Sarpy County
- Hall County
- Buffalo County
- Dodge County
- Scotts Bluff County
- Madison County
- Platte County
- Lincoln County
- Adams County
- Cass County
- Dawson County
- Saunders County
- Gage County
- Dakota County
- Washington County
- Seward County
- Otoe County
- Saline County
- York County
- Colfax County
- Box Butte County
- Custer County
- Red Willow County
- Holt County
- Wayne County
- Cheyenne County
- Hamilton County
- Phelps County
- Cuming County
- Butler County
- Knox County
- Cedar County
- Keith County
- Dawes County
- Merrick County
- Richardson County
- Pierce County
- Jefferson County
- Nemaha County
- Kearney County
- Burt County
- Thurston County
- Howard County
- Antelope County
- Clay County
- Stanton County
- Cherry County
- Dixon County
- Fillmore County
- Boone County
- Polk County
- Johnson County
- Sheridan County
- Thayer County
- Morrill County
- Furnas County
- Nuckolls County
- Valley County
- Chase County
- Webster County
- Kimball County
- Nance County
- Harlan County
- Sherman County
- Brown County
- Franklin County
- Perkins County
- Frontier County
- Pawnee County
- Hitchcock County
- Greeley County
- Deuel County
- Gosper County
- Garden County
- Garfield County
- Boyd County
- Dundy County
- Rock County
- Sioux County
- Hayes County
- Keya Paha County
- Wheeler County
- Hooker County
- Logan County
- Banner County
- Thomas County
- Loup County
- Grant County
- Blaine County
- Arthur County
- McPherson County