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 | Cherry Hill |
6.40 pCi/L
|
9 |
| 2 | Sicklerville |
7.00 pCi/L
|
3 |
| 3 | Mount Laurel |
4.70 pCi/L
|
3 |
| 4 | Marlton |
3.70 pCi/L
|
3 |
| 5 | Runnemede |
10.00 pCi/L
|
2 |
Other Metro Areas in New Jersey
Explore radon data for other metropolitan regions across the state.
Cities in the Philadelphia Metro Area
38 cities and towns in the Philadelphia Metro metropolitan area with user-submitted radon data.
38 cities
Runnemede
Zone 1
10.0
pCi/L
Above EPA action level
Lawnside
Zone 1
10.0
pCi/L
Above EPA action level
Berlin
Zone 1
9.0
pCi/L
Above EPA action level
Columbus
Zone 1
9.0
pCi/L
Above EPA action level
Woodstown
Zone 1
8.0
pCi/L
Above EPA action level
Bordentown
Zone 1
7.5
pCi/L
Above EPA action level
Vincentown
Zone 1
7.5
pCi/L
Above EPA action level
Sicklerville
Zone 1
7.0
pCi/L
Above EPA action level
Mullica Hill
Zone 1
7.0
pCi/L
Above EPA action level
Allentown
Zone 1
7.0
pCi/L
Above EPA action level
Elmer
Zone 1
7.0
pCi/L
Above EPA action level
Gloucester City
Zone 1
7.0
pCi/L
Above EPA action level
Monroeville
Zone 1
7.0
pCi/L
Above EPA action level
Cherry Hill
Zone 1
6.4
pCi/L
Above EPA action level
Chesterfield
Zone 1
6.0
pCi/L
Above EPA action level
Mount Holly
Zone 1
6.0
pCi/L
Above EPA action level
Blackwood
Zone 1
6.0
pCi/L
Above EPA action level
Roebling
Zone 1
6.0
pCi/L
Above EPA action level
Somerdale
Zone 1
6.0
pCi/L
Above EPA action level
Swedesboro
Zone 1
5.5
pCi/L
Above EPA action level
Sewell
Zone 1
5.0
pCi/L
Above EPA action level
Williamstown
Zone 1
5.0
pCi/L
Above EPA action level
Lumberton
Zone 1
5.0
pCi/L
Above EPA action level
Riverside
Zone 1
5.0
pCi/L
Above EPA action level
Trenton
Zone 1
5.0
pCi/L
Above EPA action level
Wrightstown
Zone 1
5.0
pCi/L
Above EPA action level
Mount Laurel
Zone 1
4.7
pCi/L
Above EPA action level
Burlington
Zone 1
4.5
pCi/L
Above EPA action level
Hainesport
Zone 1
4.5
pCi/L
Above EPA action level
Voorhees
Zone 1
4.5
pCi/L
Above EPA action level
Atco
Zone 3
4.0
pCi/L
Below EPA action level
Clayton
Zone 3
4.0
pCi/L
Below EPA action level
Maple Shade
Zone 3
4.0
pCi/L
Below EPA action level
Medford
Zone 3
4.0
pCi/L
Below EPA action level
Wenonah
Zone 3
4.0
pCi/L
Below EPA action level
Marlton
Zone 3
3.7
pCi/L
Below EPA action level
Franklinville
Zone 3
3.0
pCi/L
Below EPA action level
Moorestown
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 | |
|---|---|
| DeBouno and Associates | |
| Radon Shield LLC |
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 New Jersey required to test for radon?
Radon testing and disclosure requirements vary by state and municipality. Some New Jersey 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.