Radon in Billings County, North Dakota
Billings County, North Dakota, is in EPA radon Zone 1: predicted average indoor radon screening level greater than 4 pCi/L (highest potential). Radon laboratories reported 12 building tests here for 2008 to 2017: median 11.0 pCi/L, with 85% at or above EPA's 4 pCi/L action level (North Dakota 58.9%, US 36.5%).
Radon test results in Billings County
| Test results | Period | Tests | Typical result | 4 pCi/L or more |
|---|---|---|---|---|
| Radon testing laboratories | 2008-2017 | 12 | median 11.0 pCi/L | 85% |
| North Dakota, all counties (labs) | 2008-2017 | 5,054 | n/a | 58.9% |
| United States (labs) | 2008-2017 | 1,408,802 | n/a | 36.5% |
Test results describe buildings whose owners chose to test and whose results reached the lab or agency, not a random sample; small counts swing widely. State and US shares are computed from county counts and percents. The laboratory data comes from national radon testing laboratories and supplements EPA's zone map.
Radon in nearby counties
| County | EPA zone | Lab tests | 4 pCi/L or more |
|---|---|---|---|
| Golden Valley County, ND | Zone 1 | 6 | 71.4% |
| Stark County, ND | Zone 1 | 242 | 62.4% |
| Slope County, ND | Zone 1 | 4 | 70% |
| Dunn County, ND | Zone 1 | 23 | 74.3% |
| Wibaux County, MT | Zone 1 | 4 | 50% |
| McKenzie County, ND | Zone 1 | 29 | 56.1% |
The six counties with the nearest centers.
What to do about radon in Billings County
Test the building. EPA recommends fixing a home at 4 pCi/L or more and considering a fix between 2 and 4 pCi/L, and says there is no known safe level of exposure. North Dakota's state radon program can point you to testers and test kits.
Buying here? The Environmental Records Report lists this county's radon zone and test results with the flood zone, mapped faults, power lines and federal contamination records near the address.
Radon in Billings County: questions
What is the radon level in Billings County?
The median of the 12 laboratory tests reported for Billings County (2008 to 2017) was 11.0 pCi/L, and 85% of them were at or above 4 pCi/L. These are results of tested buildings; a single home can be far above or below them.
Is Billings County in radon Zone 1?
Yes. EPA's 1993 Map of Radon Zones puts Billings County in Zone 1, the counties with a predicted average indoor radon screening level above 4 pCi/L.
How does radon in Billings County compare with North Dakota?
85% of laboratory tests in Billings County were at or above 4 pCi/L for 2008 to 2017, against 58.9% across North Dakota (5,054 tests) and 36.5% nationally. 53 of North Dakota's 53 counties are in Zone 1.
Should I test for radon in Billings County?
Yes. EPA recommends testing every home whatever its zone: "This map should not be used to determine if individual homes need to be tested." Fix the home at 4 pCi/L or more and consider a fix between 2 and 4 pCi/L; EPA says there is no known safe level of radon exposure.
More for Billings County
- Billings loan limitsThis year's FHFA conforming, FHA and VA county loan limits for 1 to 4 unit homes, from FHFA's and HUD's official files.
- Billings fair market rentHUD Fair Market Rents for studios to 4 bedrooms, the voucher payment standard range and the change from last year.
- Billings property tax rateEffective property tax rate from Census survey data: median taxes paid against median home value, ranked in the state.
- Environmental records reportSuperfund, hazardous waste, leaking tank and brownfield sites near any Billings address, with distances and a site map. A records search, not a Phase I.
- Superfund sites in North DakotaEvery EPA Superfund site in North Dakota with its status, county and a map, refreshed nightly from federal records.
- USDA eligibility map: North DakotaHow much of each North Dakota county is in a USDA-eligible rural area, the towns mapped ineligible, and a free address check.
- Opportunity zones in North DakotaEvery designated Opportunity Zone tract in North Dakota by county, from the IRS list, and the tracts eligible for the 2027 round.
- Census tract lookupThe census tract of any Billings address with its FFIEC income level and HUD Qualified Census Tract and DDA status.
Other free hazard lookups
- 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).
Radon in every North Dakota county · Radon map of every state
Data compiled 2026-10-20. County FIPS 38007. County-level screening information, not a radon measurement of any building.