Thornton, CO Radon Mitigation and Testing

Q: What EPA Radon Zone is Thornton in?

Thornton is in Adams County, EPA Zone 1.

Q: How much does radon mitigation cost in Thornton?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Adams County

EPA Zone 1

Situated in Adams County as part of the Denver Metro area, Thornton lies over sedimentary formations and prairie soils that can produce variable radon conditions. The city's suburban neighborhoods feature predominantly single-family homes built from the 1970s onward, many with full basements where radon can accumulate. Limited testing data is currently available for zip code 80241, making professional radon testing especially important for homeowners in this EPA Zone 1 area.

Thornton, CO Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Thornton, CO Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Thornton Radon Facts

Key details about the radon risk profile for Thornton and the 80241 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Adams County, CO

Zip Code

80241

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Thornton and the 80241 zip code are located in Adams County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Thornton, CO

What EPA Radon Zone is Thornton in?

Thornton and the 80241 zip code are in Adams County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Thornton?

Radon mitigation in Thornton typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Thornton?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.

Most Active Radon Markets in Colorado

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Fairplay	12.00 pCi/L	9
Crested Butte	8.56 pCi/L	9
Denver	6.22 pCi/L	9
Montrose	9.25 pCi/L	8
Gunnison	7.38 pCi/L	8
Buena Vista	12.57 pCi/L	7
Pueblo	10.67 pCi/L	6
Grand Junction	8.17 pCi/L	6
Bayfield	6.00 pCi/L	6
Canon City	10.80 pCi/L	5
Aurora	7.40 pCi/L	5
Windsor	7.00 pCi/L	5
Telluride	6.80 pCi/L	5
Parker	5.40 pCi/L	5
Salida	15.50 pCi/L	4
Johnstown	9.50 pCi/L	4
Granby	9.00 pCi/L	4
Longmont	8.00 pCi/L	4
Edwards	6.75 pCi/L	4
Mancos	6.00 pCi/L	4