Westminster, MD Radon Mitigation and Testing

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.

Avg: 14.50 pCi/L

Carroll County

EPA Zone 1

4 user tests

Westminster is located in Carroll County, Maryland. With 4 user-submitted readings averaging 14.50 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 21157 zip code.

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

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

Westminster, MD Radon Testing

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

Westminster, Maryland Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
20 pCi/L	Westminster, MD	21-50 Years	Full Basement	Dec 2021
9 pCi/L	Westminster, MD	100+ Years	Full Basement	Aug 2021

Have a radon test result for Westminster? Submit your reading to help other homeowners.

Westminster Radon Facts

Key details about the radon risk profile for Westminster and the 21157 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Carroll County, MD

Zip Code

21157

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

14.50 pCi/L

User Tests Submitted

Westminster and the 21157 zip code are located in Carroll 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 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 with the most user-submitted radon test data in the state.

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
Clarksburg	8.00 pCi/L	3
Gambrills	6.00 pCi/L	3
Elkton	5.33 pCi/L	3
Silver Spring	4.33 pCi/L	3
Chesapeake Beach	14.00 pCi/L	2
Cumberland	9.00 pCi/L	2
Frostburg	9.00 pCi/L	2
Owings	5.50 pCi/L	2
Huntingtown	4.50 pCi/L	2
Mc Henry	20.00 pCi/L	1
Mount Airy	20.00 pCi/L	1