Princeton, NC Radon Levels

Q: What EPA Radon Zone is Princeton in?

Princeton is in Johnston County, EPA Zone 3.

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

No homeowner radon tests have been submitted for Princeton yet, so readings from the closest cities and the Johnston 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 Princeton?

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

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

Princeton, NC Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County Johnston County, NC

Zip Code 27569

Situated in Johnston County within the Raleigh Metro area, Princeton reflects the Piedmont region's geological characteristics that can influence radon levels. While comprehensive testing data for zip code 27569 is developing, North Carolina's crystalline bedrock can create variable radon conditions. Homeowners should consider testing to establish their specific radon exposure.

5.00

pCi/L area average

Above EPA Action Level

Johnston County average: 5.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Princeton 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+

Princeton, NC 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 Princeton?

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Radon Readings Near Princeton, NC

No homeowner tests have been submitted for Princeton 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
Benson	21.4 mi	5.00 pCi/L	1
Wendell	26.8 mi	20.00 pCi/L	1
Zebulon	27.3 mi	9.00 pCi/L	1
Raleigh	37.4 mi	9.00 pCi/L	1
Wake Forest	41.9 mi	4.50 pCi/L	2
Louisburg	41.9 mi	3.50 pCi/L	2
Apex	42.1 mi	3.50 pCi/L	2
Cary	42.2 mi	5.00 pCi/L	4

Johnston County Radon Profile

Johnston County is classified as EPA Radon Zone 3, the lowest predicted-risk tier, with modeled indoor screening averages below 2 pCi/L. Homeowner-submitted tests from 1 city in Johnston County average 5.00 pCi/L across 1 test — 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 Johnston County.

Radon FAQ for Princeton, NC

What EPA Radon Zone is Princeton in?

Princeton and the 27569 zip code are in Johnston County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

Why are radon readings shown from areas near Princeton?

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

Radon mitigation in Princeton 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 Princeton?

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.