Columbia, MD Radon Levels

Q: What EPA Radon Zone is Columbia in?

Columbia is in Howard County, EPA Zone 1.

Q: How much does radon mitigation cost in Columbia?

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

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

Columbia, MD Radon Facts

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

County Howard County, MD

Zip Code 21044

This planned community in Howard County sits between Baltimore and Washington, D.C., on Piedmont plateau formations that can produce moderate-to-high radon levels. The 21044 zip code features predominantly newer homes built since the 1960s, many with full basements and modern construction typical of suburban Maryland development. While comprehensive testing data is currently limited, Maryland's complex geological conditions and the area's position within the Piedmont region warrant professional radon assessment for all residential properties.

Columbia, 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 Columbia, MD

What EPA Radon Zone is Columbia in?

Columbia and the 21044 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 Columbia?

Radon mitigation in Columbia 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 Columbia?

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