Somersworth in Strafford County shows concerning radon levels, with current data indicating an average of 20.0 pCi/L — significantly exceeding the EPA action level of 4.0 pCi/L. This southeastern New Hampshire community's granite bedrock and glacial till soils create ideal conditions for radon accumulation in homes. Given these elevated readings, all Somersworth residents should prioritize radon testing and mitigation if necessary.
20.00
pCi/L average
Above EPA Action Level
Based on 1 user-submitted radon test for homes in Somersworth, NH. The EPA recommends taking action at or above 4.0 pCi/L.
0
4.0 EPA
10+
Somersworth, NH Radon Mitigation
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User-submitted radon test readings from homes in the Somersworth area.
Radon Level
City
Home Age
Foundation
20 pCi/L
Somersworth, NH
0-20 Years
Partial Basement
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Radon FAQ for Somersworth, NH
What is the average radon level in Somersworth, NH?
Based on 1 user-submitted test, the average radon level in Somersworth is 20.00 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 Somersworth in?
Somersworth and the 03878 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 Somersworth?
Radon mitigation in Somersworth 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 Somersworth?
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.
