Catonsville, MD Radon Mitigation and Testing

Q: What EPA Radon Zone is Catonsville in?

Catonsville is in Baltimore County, EPA Zone 1.

Q: How much does radon mitigation cost in Catonsville?

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

Baltimore County

EPA Zone 1

This established suburb in Baltimore County features mid-century residential development on Piedmont plateau geology known for variable radon potential. The community's mature housing stock includes many homes with full basements built during the post-war suburban expansion of the Baltimore Metro. While comprehensive testing data for zip code 21228 is currently limited, the underlying geological conditions suggest residents should test their homes for radon.

Catonsville, MD Radon Mitigation

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

Catonsville, MD Radon Testing

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

Catonsville Radon Facts

Key details about the radon risk profile for Catonsville and the 21228 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Baltimore County, MD

Zip Code

21228

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Catonsville and the 21228 zip code are located in Baltimore 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 Catonsville, MD

What EPA Radon Zone is Catonsville in?

Catonsville and the 21228 zip code are in Baltimore 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 Catonsville?

Radon mitigation in Catonsville 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 Catonsville?

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