Norristown, PA Radon Levels

Q: What EPA Radon Zone is Norristown in?

Norristown is in Montgomery County, EPA Zone 1.

Q: How much does radon mitigation cost in Norristown?

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

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

Norristown, PA Radon Facts

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

County Montgomery County, PA

Zip Code 19401

Located in southeastern Pennsylvania's Montgomery County as part of the Philadelphia Metro, Norristown sits in EPA Zone 1 where complex Paleozoic bedrock creates high radon potential. With no testing data available for zip code 19401, homeowners should prioritize radon testing given the area's geological characteristics that frequently produce elevated radon levels.

8.41

pCi/L area average

Above EPA Action Level

Montgomery County average: 8.41 pCi/L, based on 17 user-submitted tests across 16 cities in the county. No homeowner readings have been submitted for Norristown 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+

Norristown, PA Radon Mitigation

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

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Radon Readings Near Norristown, PA

No homeowner tests have been submitted for Norristown 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
King Of Prussia	3.0 mi	7.00 pCi/L	1
Wayne	5.8 mi	5.00 pCi/L	1
North Wales	7.6 mi	7.00 pCi/L	1
Lansdale	7.6 mi	3.00 pCi/L	1
Ambler	8.0 mi	4.00 pCi/L	1
Ardmore	9.8 mi	6.00 pCi/L	2
Hatfield	10.2 mi	6.00 pCi/L	1
Glenside	10.7 mi	7.00 pCi/L	1

Montgomery County Radon Profile

Because of its underlying geology, Montgomery County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 16 cities in Montgomery County average 8.41 pCi/L across 17 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Montgomery County home regardless of zone or a neighbor's results.

Radon FAQ for Norristown, PA

What EPA Radon Zone is Norristown in?

Norristown and the 19401 zip code are in Montgomery 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 Norristown?

No homeowner radon tests have been submitted for Norristown yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Montgomery County average—are the best available indicator of local conditions until Norristown 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 Norristown?

Radon mitigation in Norristown 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 Norristown?

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.