Top 5 Radon Hotspots in the Philadelphia Metro Area
Cities with the highest average user-submitted radon readings in the Philadelphia Metro metropolitan area.
| Rank | City | Avg. Radon Level | Tests |
|---|---|---|---|
| 1 | Philadelphia |
8.00 pCi/L
|
4 |
| 2 | Swarthmore |
5.30 pCi/L
|
4 |
| 3 | Doylestown |
11.30 pCi/L
|
3 |
| 4 | Warminster |
11.00 pCi/L
|
3 |
| 5 | Elkins Park |
10.70 pCi/L
|
3 |
Other Metro Areas in Pennsylvania
Explore radon data for other metropolitan regions across the state.
Allentown Metro
View radon data
Chambersburg Metro
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Erie Metro
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Harrisburg Metro
View radon data
Lancaster Metro
View radon data
Pittsburgh Metro
View radon data
Reading Metro
View radon data
Scranton Metro
View radon data
State College Metro
View radon data
York Metro
View radon data
Cities in the Philadelphia Metro Area
55 cities and towns in the Philadelphia Metro metropolitan area with user-submitted radon data.
55 cities
Downingtown
Zone 1
20.0
pCi/L
Above EPA action level
Easton
Zone 1
20.0
pCi/L
Above EPA action level
Horsham
Zone 1
20.0
pCi/L
Above EPA action level
Wyncote
Zone 1
20.0
pCi/L
Above EPA action level
Feasterville Trevose
Zone 1
18.5
pCi/L
Above EPA action level
Croydon
Zone 1
18.0
pCi/L
Above EPA action level
Bensalem
Zone 1
16.0
pCi/L
Above EPA action level
Elverson
Zone 1
16.0
pCi/L
Above EPA action level
Hellertown
Zone 1
13.0
pCi/L
Above EPA action level
Marcus Hook
Zone 1
13.0
pCi/L
Above EPA action level
Doylestown
Zone 1
11.3
pCi/L
Above EPA action level
Warminster
Zone 1
11.0
pCi/L
Above EPA action level
Elkins Park
Zone 1
10.7
pCi/L
Above EPA action level
Kennett Square
Zone 1
9.0
pCi/L
Above EPA action level
Landenberg
Zone 1
9.0
pCi/L
Above EPA action level
Pennsburg
Zone 1
9.0
pCi/L
Above EPA action level
Newtown
Zone 1
8.7
pCi/L
Above EPA action level
Philadelphia
Zone 1
8.0
pCi/L
Above EPA action level
Abington
Zone 1
8.0
pCi/L
Above EPA action level
Morgantown
Zone 1
8.0
pCi/L
Above EPA action level
Upper Black Eddy
Zone 1
8.0
pCi/L
Above EPA action level
Broomall
Zone 1
7.0
pCi/L
Above EPA action level
Coopersburg
Zone 1
7.0
pCi/L
Above EPA action level
Garnet Valley
Zone 1
7.0
pCi/L
Above EPA action level
Glenside
Zone 1
7.0
pCi/L
Above EPA action level
Jenkintown
Zone 1
7.0
pCi/L
Above EPA action level
King Of Prussia
Zone 1
7.0
pCi/L
Above EPA action level
North Wales
Zone 1
7.0
pCi/L
Above EPA action level
Nottingham
Zone 1
7.0
pCi/L
Above EPA action level
Pottstown
Zone 1
7.0
pCi/L
Above EPA action level
West Chester
Zone 1
6.7
pCi/L
Above EPA action level
Ardmore
Zone 1
6.0
pCi/L
Above EPA action level
Hatfield
Zone 1
6.0
pCi/L
Above EPA action level
Sellersville
Zone 1
6.0
pCi/L
Above EPA action level
Springfield
Zone 1
5.7
pCi/L
Above EPA action level
Swarthmore
Zone 1
5.3
pCi/L
Above EPA action level
New Hope
Zone 1
5.3
pCi/L
Above EPA action level
Clifton Heights
Zone 1
5.0
pCi/L
Above EPA action level
Gilbertsville
Zone 1
5.0
pCi/L
Above EPA action level
Media
Zone 1
5.0
pCi/L
Above EPA action level
Pipersville
Zone 1
5.0
pCi/L
Above EPA action level
Quakertown
Zone 1
5.0
pCi/L
Above EPA action level
Wayne
Zone 1
5.0
pCi/L
Above EPA action level
Langhorne
Zone 1
4.7
pCi/L
Above EPA action level
Ambler
Zone 3
4.0
pCi/L
Below EPA action level
Aston
Zone 3
4.0
pCi/L
Below EPA action level
Bristol
Zone 3
4.0
pCi/L
Below EPA action level
Lansdowne
Zone 3
4.0
pCi/L
Below EPA action level
Morton
Zone 3
4.0
pCi/L
Below EPA action level
Oxford
Zone 3
4.0
pCi/L
Below EPA action level
Glen Mills
Zone 3
3.0
pCi/L
Below EPA action level
Lansdale
Zone 3
3.0
pCi/L
Below EPA action level
Richboro
Zone 3
3.0
pCi/L
Below EPA action level
Drexel Hill
Zone 3
2.5
pCi/L
Below EPA action level
Bala Cynwyd
Zone 3
1.0
pCi/L
Below EPA action level
Radon Mitigation Professionals Serving the Philadelphia Metro Area
Licensed contractors who serve this metro area.
| Company | |
|---|---|
| Accurate Radon Control Inc | |
| Advanced Environmental Systems | |
| Atlantic Radon Systems | |
| Cape Atlantic Inc | |
| D-Tech Inc | |
| Expert Home Group | |
| GEO Environmental | |
| Homestead Inspections | |
| Insight Home Inspection | |
| Next Step Environmental Services LLC | |
| Quality Home Services of Delaware Valley Inc | |
| Radon Technology and Environmental | |
| Real Estate Inspections | |
| Safe Shelter Environmental | |
| Strong Home LLC | |
| WPB Enterprises Inc |
Frequently Asked Questions about Radon in the Philadelphia Metro Area
Common questions about radon testing, mitigation costs, and health risks for homeowners in the Philadelphia Metro metropolitan area.
Why are radon levels so high in the Philadelphia Metro area?
Radon levels in the Philadelphia 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 Philadelphia Metro?
Professional radon mitigation in the Philadelphia 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 Pennsylvania required to test for radon?
Radon testing and disclosure requirements vary by state and municipality. Some Pennsylvania 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 Philadelphia Metro area?
Yes. High radon levels do not prevent a home sale, but buyers in the Philadelphia 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.