Westminster, MD Radon Levels

Q: What is the average radon level in Westminster, MD?

Based on 4 user-submitted tests, the average radon level is 14.50 pCi/L.

Q: What EPA Radon Zone is Westminster in?

Westminster is in Carroll County, EPA Zone 1.

Q: How much does radon mitigation cost in Westminster?

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

Check local Westminster radon levels and find certified testing and mitigation professionals to keep your home safe

Westminster, MD Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Carroll County, MD

Zip Code 21157

Avg. User Level 14.50 pCi/L

User Tests 4

Westminster in Carroll County shows an average radon level of 14.5 pCi/L based on local testing data, significantly exceeding the EPA action level of 4.0 pCi/L. Located within the Baltimore Metro area, the community sits on Piedmont geology where crystalline bedrock contributes to elevated radon potential. Homes in zip codes 21157 and 21158 should prioritize radon testing and mitigation, as the region's basement-heavy housing stock can trap significant radon concentrations.

14.50

pCi/L average

Above EPA Action Level

Based on 4 user-submitted radon tests for homes in Westminster, MD. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Westminster, MD Radon Mitigation

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Westminster, MD Radon Levels

User-submitted radon test readings from homes in the Westminster area.

Radon Level	City	Home Age	Foundation
20 pCi/L	Westminster, MD	21-50 Years	Full Basement
9 pCi/L	Westminster, MD	100+ Years	Full Basement

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Radon FAQ for Westminster, MD

What is the average radon level in Westminster, MD?

Based on 4 user-submitted tests, the average radon level in Westminster is 14.50 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Westminster in?

Westminster and the 21157 zip code are in Carroll 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 Westminster?

Radon mitigation in Westminster 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 Westminster?

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 Maryland

Cities in Maryland with the most user-submitted radon test data, ranked by number of submissions.

City	Avg User Radon Level	Submissions
Frederick	8.29 pCi/L	7
Potomac	9.00 pCi/L	6
Hagerstown	8.67 pCi/L	6
Westminster	14.50 pCi/L	4
Baltimore	7.00 pCi/L	4
Annapolis	4.25 pCi/L	4
Upper Marlboro	15.00 pCi/L	3
Edgewater	12.67 pCi/L	3
Bowie	9.00 pCi/L	3
Frostburg	8.67 pCi/L	3

Westminster, MD Radon Levels

Check local Westminster radon levels and find certified testing and mitigation professionals to keep your home safe

Westminster, MD Radon Facts

Westminster, MD Radon Mitigation

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Westminster, MD Radon Levels

Radon FAQ for Westminster, MD

Most Active Radon Markets in Maryland

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