Radon in Nebraska: radon map by county
EPA's Map of Radon Zones puts 53 of Nebraska's 93 counties in Zone 1 (predicted average indoor radon above 4 pCi/L), 24 in Zone 2 and 16 in Zone 3. Of 29,758 building tests that radon laboratories reported for 2008 to 2017, 57.9% were at or above EPA's 4 pCi/L action level, against 36.5% nationally (number 3 of 42 states with 1,000+ tests). The highest county share is Clay County (85.1% of 109 tests).
Radon by county in Nebraska
| County | EPA zone | Lab tests | Median | 4+ pCi/L |
|---|---|---|---|---|
| Adams County | Zone 1 | 785 | 5.7 | 69.3% |
| Antelope County | Zone 2 | 158 | 6.5 | 71.3% |
| Arthur County | Zone 3 | 4 | 1.5 | 0% |
| Banner County | Zone 2 | 3 | 2.8 | 0% |
| Blaine County | Zone 3 | 3 | 0.7 | 0% |
| Boone County | Zone 1 | 138 | 6.3 | 73.8% |
| Box Butte County | Zone 2 | 214 | 3.2 | 36.2% |
| Boyd County | Zone 1 | 31 | 4.6 | 59.6% |
| Brown County | Zone 3 | 37 | 3.7 | 41.9% |
| Buffalo County | Zone 2 | 644 | 4.4 | 56.6% |
| Burt County | Zone 1 | 264 | 8.6 | 79.5% |
| Butler County | Zone 1 | 303 | 7.9 | 79.3% |
| Cass County | Zone 1 | 442 | 6.3 | 66% |
| Cedar County | Zone 1 | 269 | 8.3 | 76.8% |
| Chase County | Zone 2 | 27 | 6.5 | 68.2% |
| Cherry County | Zone 3 | 22 | 1.7 | 13.3% |
| Cheyenne County | Zone 2 | 215 | 4.1 | 53.4% |
| Clay County | Zone 1 | 109 | 8.6 | 85.1% |
| Colfax County | Zone 1 | 134 | 4.9 | 56.7% |
| Cuming County | Zone 1 | 296 | 5.1 | 59.4% |
| Custer County | Zone 2 | 105 | 4.2 | 52.3% |
| Dakota County | Zone 1 | 214 | 5.0 | 61.5% |
| Dawes County | Zone 2 | 318 | 5.0 | 59.3% |
| Dawson County | Zone 2 | 165 | 3.2 | 42.7% |
| Deuel County | Zone 2 | 39 | 3.5 | 42.9% |
| Dixon County | Zone 1 | 171 | 7.6 | 78.2% |
| Dodge County | Zone 1 | 607 | 5.6 | 66.1% |
| Douglas County | Zone 1 | 6,616 | 4.0 | 51.1% |
| Dundy County | Zone 2 | 13 | 4.1 | 57.1% |
| Fillmore County | Zone 1 | 118 | 6.8 | 76.6% |
| Franklin County | Zone 1 | 61 | 6.1 | 72.2% |
| Frontier County | Zone 1 | 31 | 4.3 | 53.5% |
| Furnas County | Zone 1 | 46 | 5.5 | 66.7% |
| Gage County | Zone 1 | 423 | 6.8 | 69.7% |
| Garden County | Zone 3 | 40 | 3.5 | 37.5% |
| Garfield County | Zone 3 | 23 | 2.3 | 27.6% |
| Gosper County | Zone 1 | 28 | 5.6 | 69% |
| Grant County | Zone 3 | 4 | 0.5 | 0% |
| Greeley County | Zone 1 | 32 | 4.7 | 57.9% |
| Hall County | Zone 2 | 868 | 3.2 | 36.7% |
| Hamilton County | Zone 1 | 255 | 6.7 | 74.9% |
| Harlan County | Zone 1 | 49 | 5.9 | 65.8% |
| Hayes County | Zone 1 | 6 | 4.6 | 62.5% |
| Hitchcock County | Zone 1 | 24 | 4.2 | 51.6% |
| Holt County | Zone 3 | 237 | 3.3 | 42.7% |
| Hooker County | Zone 3 | 3 | 0.8 | 0% |
| Howard County | Zone 2 | 73 | 2.5 | 32.5% |
| Jefferson County | Zone 1 | 209 | 6.6 | 67.4% |
| Johnson County | Zone 1 | 61 | 5.6 | 62.2% |
| Kearney County | Zone 1 | 84 | 4.7 | 59.4% |
| Keith County | Zone 2 | 86 | 4.3 | 55% |
| Keya Paha County | Zone 2 | 7 | 2.8 | 28.6% |
| Kimball County | Zone 2 | 56 | 3.6 | 44.4% |
| Knox County | Zone 1 | 241 | 6.2 | 68.8% |
| Lancaster County | Zone 1 | 3,536 | 4.8 | 58.1% |
| Lincoln County | Zone 3 | 658 | 2.6 | 27% |
| Logan County | Zone 3 | 6 | 2.3 | 12.5% |
| Loup County | Zone 3 | 8 | 1.1 | 6.7% |
| Madison County | Zone 1 | 790 | 6.1 | 66.4% |
| McPherson County | Zone 3 | 6 | 1.0 | 0% |
| Merrick County | Zone 2 | 124 | 2.3 | 26.3% |
| Morrill County | Zone 2 | 39 | 3.3 | 42.9% |
| Nance County | Zone 1 | 115 | 5.3 | 60.8% |
| Nemaha County | Zone 1 | 212 | 8.7 | 74.9% |
| Nuckolls County | Zone 1 | 154 | 8.4 | 78.7% |
| Otoe County | Zone 1 | 300 | 6.5 | 69.9% |
| Pawnee County | Zone 1 | 86 | 4.7 | 58.6% |
| Perkins County | Zone 2 | 29 | 4.0 | 50% |
| Phelps County | Zone 1 | 201 | 4.9 | 60.4% |
| Pierce County | Zone 1 | 152 | 4.5 | 55.1% |
| Platte County | Zone 1 | 682 | 4.1 | 51.5% |
| Polk County | Zone 1 | 111 | 6.8 | 77.1% |
| Red Willow County | Zone 1 | 239 | 4.6 | 61% |
| Richardson County | Zone 1 | 319 | 7.4 | 75.6% |
| Rock County | Zone 3 | 14 | 1.2 | 4.2% |
| Saline County | Zone 1 | 180 | 6.2 | 69.4% |
| Sarpy County | Zone 1 | 3,288 | 4.3 | 53.6% |
| Saunders County | Zone 1 | 423 | 6.8 | 72.7% |
| Scotts Bluff County | Zone 2 | 411 | 4.3 | 57.2% |
| Seward County | Zone 1 | 552 | 7.6 | 75.4% |
| Sheridan County | Zone 2 | 75 | 2.9 | 34.6% |
| Sherman County | Zone 2 | 55 | 3.9 | 48.4% |
| Sioux County | Zone 2 | 13 | 1.9 | 31.6% |
| Stanton County | Zone 1 | 133 | 5.8 | 63.9% |
| Thayer County | Zone 1 | 78 | 5.6 | 68.2% |
| Thomas County | Zone 3 | 9 | 0.7 | 11.1% |
| Thurston County | Zone 1 | 68 | 7.0 | 77.2% |
| Valley County | Zone 2 | 68 | 4.2 | 52.4% |
| Washington County | Zone 1 | 403 | 5.9 | 68.6% |
| Wayne County | Zone 1 | 347 | 8.1 | 76% |
| Webster County | Zone 1 | 82 | 7.7 | 83.2% |
| Wheeler County | Zone 3 | 7 | 0.9 | 25% |
| York County | Zone 1 | 374 | 7.7 | 80% |
Lab tests: buildings tested by radon laboratories, 2008 to 2017; median in pCi/L; “4+ pCi/L” is the share of tests at or above EPA's action level. n/a: no value on file (no tests, or too few to report).
What the zones mean
Zone 1 counties have a predicted average indoor radon screening level above 4 pCi/L, Zone 2 from 2 to 4 pCi/L and Zone 3 below 2 pCi/L. The prediction is from 1993 indoor measurements, geology, aerial radioactivity, soils and foundation types. EPA: “This map should not be used to determine if individual homes need to be tested.” EPA recommends fixing a home at 4 pCi/L or more and considering a fix between 2 and 4 pCi/L, because there is no known safe level of exposure.
Radon in Nebraska: questions
What radon zone is Nebraska?
EPA's 1993 map does not give states one zone; it zones each county. In Nebraska, 53 counties are Zone 1, 24 Zone 2 and 16 Zone 3. EPA says the map "should not be used to determine if individual homes need to be tested".
Which Nebraska counties have the highest radon levels?
By the share of laboratory tests at or above 4 pCi/L for 2008 to 2017 (counties with 20 or more tests): Clay County 85.1% (median 8.6 pCi/L, 109 tests); Webster County 83.2% (median 7.7 pCi/L, 82 tests); York County 80% (median 7.7 pCi/L, 374 tests); Burt County 79.5% (median 8.6 pCi/L, 264 tests); Butler County 79.3% (median 7.9 pCi/L, 303 tests).
How common is high radon in Nebraska?
57.9% of the 29,758 tests in the laboratory data for Nebraska (2008 to 2017) were at or above 4 pCi/L; the national share was 36.5%. Buildings are tested by choice, often because of a sale or a concern, so the share describes the tests on file, not every home.
Does Nebraska publish its own radon test data?
Nebraska's radon program reports county test results; the latest year with county results is 2023, shown on each county page.
Should I test for radon in Nebraska?
Yes. EPA recommends testing every home no matter where it is, fixing it at 4 pCi/L or more and considering a fix between 2 and 4 pCi/L, because there is no known safe level of radon exposure.
States bordering Nebraska
Other free hazard lookups
- Radon by county and ZIP codeEPA radon zone and the radon test results on file for any county, ZIP code or address.
- Fault lines near an addressUSGS-mapped earthquake faults within 5 miles, their age and slip rate, and the USGS seismic hazard value.
- Power lines near an addressHigh-voltage transmission lines within 1 mile from federal maps, with voltage and distance.
- Flood zone lookupThe FEMA flood zone mapped at any US address. Not an official flood zone determination.
- Superfund sites near an addressThe nearest EPA Superfund (NPL) sites and their status.
All of these, plus wetlands, FEMA hazard ratings and the federal contamination lists, are in the Environmental Records Report for any US address ($29).
Superfund sites in Nebraska · Radon map of every state
Data compiled 2026-10-20. County-level screening information, not a radon measurement of any building.