Durham in Strafford County shows an average radon level of 10.5 pCi/L based on local testing data, significantly exceeding the EPA's 4.0 pCi/L action threshold. This university town, part of the greater Boston metropolitan area, sits atop New Hampshire's granite bedrock, which naturally produces elevated radon levels in many homes. The area's mix of historic and modern housing, often featuring full basements, creates ideal conditions for radon accumulation.
10.50
pCi/L average
Above EPA Action Level
Based on 2 user-submitted radon tests for homes in Durham, NH. The EPA recommends taking action at or above 4.0 pCi/L.
0
4.0 EPA
10+
Durham, NH Radon Mitigation
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User-submitted radon test readings from homes in the Durham area.
Radon Level
City
Home Age
Foundation
10 pCi/L
Durham, NH
—
Full Basement
11 pCi/L
Durham, NH
21-50 Years
Full Basement
Have a radon test result for Durham? Submit your reading to help other homeowners.
Radon FAQ for Durham, NH
What is the average radon level in Durham, NH?
Based on 2 user-submitted tests, the average radon level in Durham is 10.50 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.
What EPA Radon Zone is Durham in?
Durham and the 03824 zip code are in Strafford County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.
How much does radon mitigation cost in Durham?
Radon mitigation in Durham 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 Durham?
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.
Most Active Radon Markets in New Hampshire
Cities in New Hampshire with the most user-submitted radon test data, ranked by number of submissions.
