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Baltimore Metro, MD Radon Information

The Baltimore Metro metropolitan area in Maryland has a regional average radon level of 8.9 pCi/L based on 58 user-submitted tests. This exceeds the EPA’s recommended action level of 4.0 pCi/L, meaning radon testing and professional mitigation should be a priority for homeowners across the region.

Radon is a naturally occurring radioactive gas produced by the decay of uranium in soil and bedrock. In the Baltimore Metro area, local geology and common residential construction—particularly homes with basements and crawlspaces—allow radon to seep indoors and accumulate to dangerous concentrations. Particularly high readings have been recorded in communities like Westminster, Baltimore, Annapolis, where professional radon testing and mitigation services are strongly recommended.

Whether you are buying a home, selling a property, or simply want to protect your family, a professional radon test is the only way to know your home’s levels. If elevated radon is found, a licensed mitigation contractor can install a sub-slab depressurization system—typically in one day—to reduce levels by up to 99%. Request a free radon mitigation quote

The regional average is 8.9 pCi/L — above the EPA action level of 4.0 pCi/L. Testing and mitigation are strongly recommended.
8.9
Avg. pCi/L
36
Cities
58
User Tests
Zone 1
EPA Rating
Above EPA Action Level
Below EPA Action Level

Top 5 Radon Hotspots in the Baltimore Metro Area

Cities with the highest average user-submitted radon readings in the Baltimore Metro metropolitan area.

Rank City Avg. Radon Level Tests
1 Westminster
14.50 pCi/L
4
2 Baltimore
7.00 pCi/L
4
3 Annapolis
4.30 pCi/L
4
4 Havre De Grace
14.70 pCi/L
3
5 Edgewater
12.70 pCi/L
3

Other Metro Areas in Maryland

Explore radon data for other metropolitan regions across the state.

Hagerstown Metro
View radon data
Lexington Park Metro
View radon data
Philadelphia Metro
View radon data
Washington Metro
View radon data

Cities in the Baltimore Metro Area

36 cities and towns in the Baltimore Metro metropolitan area with user-submitted radon data.

36 cities
Forest Hill Zone 1
20.0 pCi/L
Above EPA action level
Pikesville Zone 1
20.0 pCi/L
Above EPA action level
Taneytown Zone 1
20.0 pCi/L
Above EPA action level
Hanover Zone 1
19.0 pCi/L
Above EPA action level
Harwood Zone 1
19.0 pCi/L
Above EPA action level
Havre De Grace Zone 1
14.7 pCi/L
Above EPA action level
Westminster Zone 1
14.5 pCi/L
Above EPA action level
Mount Airy Zone 1
14.0 pCi/L
Above EPA action level
Edgewater Zone 1
12.7 pCi/L
Above EPA action level
Finksburg Zone 1
11.0 pCi/L
Above EPA action level
Parkton Zone 1
10.5 pCi/L
Above EPA action level
Cockeysville Zone 1
10.0 pCi/L
Above EPA action level
Owings Mills Zone 1
10.0 pCi/L
Above EPA action level
Crownsville Zone 1
9.0 pCi/L
Above EPA action level
Dunkirk Zone 1
9.0 pCi/L
Above EPA action level
Millersville Zone 1
8.0 pCi/L
Above EPA action level
Baltimore Zone 1
7.0 pCi/L
Above EPA action level
Hampstead Zone 1
7.0 pCi/L
Above EPA action level
Elkridge Zone 1
7.0 pCi/L
Above EPA action level
West Friendship Zone 1
7.0 pCi/L
Above EPA action level
Gambrills Zone 1
6.0 pCi/L
Above EPA action level
Lothian Zone 1
6.0 pCi/L
Above EPA action level
Lutherville Timonium Zone 1
6.0 pCi/L
Above EPA action level
Towson Zone 1
6.0 pCi/L
Above EPA action level
Owings Zone 1
5.5 pCi/L
Above EPA action level
Arnold Zone 1
5.0 pCi/L
Above EPA action level
Jarrettsville Zone 1
5.0 pCi/L
Above EPA action level
Nottingham Zone 1
5.0 pCi/L
Above EPA action level
Sykesville Zone 1
5.0 pCi/L
Above EPA action level
Severna Park Zone 1
4.7 pCi/L
Above EPA action level
Annapolis Zone 1
4.3 pCi/L
Above EPA action level
Chestertown Zone 3
4.0 pCi/L
Below EPA action level
Crofton Zone 3
4.0 pCi/L
Below EPA action level
Perry Hall Zone 3
4.0 pCi/L
Below EPA action level
Union Bridge Zone 3
4.0 pCi/L
Below EPA action level
Kingsville Zone 3
2.5 pCi/L
Below EPA action level

Radon Mitigation Professionals Serving the Baltimore Metro Area

Licensed contractors who serve this metro area.

Company
ADE Radon Mitigation Services LLC
Affordable Radon Reduction Inc
APECS Inc
Arundel Home Inspection LLC
Avanty Construction Services
Awareness Home Inspection Services LLC
B-Sure Home Inspection Inc
Buyers Protection Group
Chesapeake Environmental Solutions
Connor Environmental Services
EBI Consulting
G.M.D. Construction Inc
Guardian Home Inspections LLC
Harford Radon Consultants
Home Advantage Home Inspections Inc
J & P Home Inspection Services
Mill Water Inc
Pillar to Post Professional Home Inspection
Sherlock Home Inspection Services
Showalter Property Consultants
SWAT Environmental Inc
Target Radon
US Inspect LLC
US Inspect LLC
Utz Plumbing Services LLC
Vane Property Inspections
Your Castle Home Inspections

Frequently Asked Questions about Radon in the Baltimore Metro Area

Common questions about radon testing, mitigation costs, and health risks for homeowners in the Baltimore Metro metropolitan area.

Why are radon levels so high in the Baltimore Metro area?
Radon levels in the Baltimore Metro area are driven by the local soil and bedrock composition, which contains naturally occurring uranium. As uranium decays, it produces radon gas that migrates upward through the soil and enters homes through foundation cracks, sump pits, and gaps around pipes. Homes with basements and crawlspaces are especially susceptible because these below-grade spaces are in direct contact with the soil where radon concentrations are highest.
How much does radon mitigation cost in Baltimore Metro?
Professional radon mitigation in the Baltimore Metro metropolitan area typically costs between $800 and $2,500, depending on the size and construction of your home. The most common approach is an active sub-slab depressurization system, which a certified contractor can usually install in a single day. Ongoing energy costs for the mitigation fan are minimal—roughly $5–$10 per month—and most systems reduce radon levels by 90% or more.
Are landlords in Maryland required to test for radon?
Radon testing and disclosure requirements vary by state and municipality. Some Maryland jurisdictions require landlords to disclose known radon levels or test results, while others have no mandate. Regardless of local law, the EPA recommends radon testing for all residential properties—including rentals—since radon is the second leading cause of lung cancer in the United States.
Can I sell a house with high radon levels in the Baltimore Metro area?
Yes. High radon levels do not prevent a home sale, but buyers in the Baltimore Metro market routinely request radon testing during the inspection period. If levels exceed 4.0 pCi/L, the buyer may negotiate for the seller to install a mitigation system before closing. Having a radon mitigation system already in place can actually be a selling point, demonstrating proactive home maintenance and providing documented proof of safe indoor air quality.