Darby, PA Radon Levels

Q: What EPA Radon Zone is Darby in?

Darby is in Delaware County, EPA Zone 1.

Q: Why are radon readings shown from areas near Darby?

No homeowner radon tests have been submitted for Darby yet, so readings from the closest cities and the Delaware County average are used as the best available indicator of local conditions. The EPA recommends testing every individual home.

Q: How much does radon mitigation cost in Darby?

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

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

Darby, PA Radon Facts

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

County Delaware County, PA

Zip Code 19023

Suburban Delaware County within the Philadelphia Metro area sits on coastal plain sediments and fractured bedrock that place this region in EPA Zone 1 for highest radon potential. The community's mix of mid-century suburban homes typically features basements where radon can accumulate effectively. While specific testing data for zip code 19023 is currently limited, the geological conditions and housing characteristics strongly suggest residents should test their properties for radon exposure.

5.59

pCi/L area average

Above EPA Action Level

Delaware County average: 5.59 pCi/L, based on 22 user-submitted tests across 13 cities in the county. No homeowner readings have been submitted for Darby itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Darby, PA Radon Mitigation

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

Need Radon Mitigation or Testing in Darby?

100% Free, No-Obligation Quotes
Matches You with State-Licensed Delaware County Pros

1-800-299-3578 610-255-7504 (local) Toll-free · Mon–Fri 8am–6pm ET

Radon Readings Near Darby, PA

No homeowner tests have been submitted for Darby yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Clifton Heights	1.0 mi	5.00 pCi/L	1
Lansdowne	1.4 mi	4.00 pCi/L	1
Drexel Hill	2.9 mi	2.50 pCi/L	2
Morton	3.0 mi	4.00 pCi/L	1
Springfield	3.5 mi	5.67 pCi/L	3
Swarthmore	4.4 mi	5.25 pCi/L	4
Ardmore	6.0 mi	6.00 pCi/L	2
Broomall	6.2 mi	7.00 pCi/L	2

Delaware County Radon Profile

The bedrock and soils beneath Delaware County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. Homeowner-submitted tests from 13 cities in Delaware County average 5.59 pCi/L across 22 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Delaware County.

Radon FAQ for Darby, PA

What EPA Radon Zone is Darby in?

Darby and the 19023 zip code are in Delaware 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.

Why are radon readings shown from areas near Darby?

No homeowner radon tests have been submitted for Darby yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Delaware County average—are the best available indicator of local conditions until Darby homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

How much does radon mitigation cost in Darby?

Radon mitigation in Darby 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 Darby?

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.