Located in Merrimack County in central New Hampshire, New London falls within EPA Zone 2 and shows significant radon activity with an average reading of 15.0 pCi/L. This level substantially exceeds the EPA's 4.0 pCi/L action threshold, reflecting the region's granite bedrock and the prevalence of homes with basements in this area. Properties in zip code 03257 should prioritize immediate radon testing and mitigation given these elevated readings documented in the community.
15.00
pCi/L average
Above EPA Action Level
Based on 1 user-submitted radon test for homes in New London, NH. The EPA recommends taking action at or above 4.0 pCi/L.
0
4.0 EPA
10+
New London, NH Radon Mitigation
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User-submitted radon test readings from homes in the New London area.
Radon Level
City
Home Age
Foundation
15 pCi/L
New London, NH
0-20 Years
Full Basement
Have a radon test result for New London? Submit your reading to help other homeowners.
Radon FAQ for New London, NH
What is the average radon level in New London, NH?
Based on 1 user-submitted test, the average radon level in New London is 15.00 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 New London in?
New London and the 03257 zip code are in Merrimack 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 New London?
Radon mitigation in New London 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 New London?
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.
