Ellicott City, MD Radon Levels

Q: What EPA Radon Zone is Ellicott City in?

Ellicott City is in Howard County, EPA Zone 1.

Q: How much does radon mitigation cost in Ellicott City?

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

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

Ellicott City, MD Radon Facts

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

County Howard County, MD

Zip Code 21042

Located in Howard County within the Baltimore Metro area, Ellicott City sits over Piedmont metamorphic bedrock that can produce elevated radon levels in the region's characteristic split-level and colonial homes. Housing throughout zip code 21042 features predominantly full basements and walkout basement designs common to Maryland's rolling terrain. With comprehensive radon testing data currently limited for this established suburban community, residents should conduct individual home testing to assess their radon exposure.

Ellicott City, MD Radon Mitigation

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

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Radon FAQ for Ellicott City, MD

What EPA Radon Zone is Ellicott City in?

Ellicott City and the 21042 zip code are in Howard 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 Ellicott City?

Radon mitigation in Ellicott City 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 Ellicott City?

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
Clarksburg	8.00 pCi/L	3