Plymouth in Grafton County shows a concerning average radon level of 13.0 pCi/L, significantly exceeding EPA action guidelines. This White Mountain community in zip code 03264 sits on granite bedrock known for high uranium content, which decays to produce radon gas. Immediate professional mitigation is strongly recommended for homes showing elevated readings.
13.00
pCi/L average
Above EPA Action Level
Based on 1 user-submitted radon test for homes in Plymouth, NH. The EPA recommends taking action at or above 4.0 pCi/L.
0
4.0 EPA
10+
Plymouth, NH Radon Mitigation
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User-submitted radon test readings from homes in the Plymouth area.
Radon Level
City
Home Age
Foundation
13 pCi/L
Plymouth, NH
0-20 Years
Full Basement
Have a radon test result for Plymouth? Submit your reading to help other homeowners.
Radon FAQ for Plymouth, NH
What is the average radon level in Plymouth, NH?
Based on 1 user-submitted test, the average radon level in Plymouth is 13.00 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 Plymouth in?
Plymouth and the 03264 zip code are in Grafton 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 Plymouth?
Radon mitigation in Plymouth 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 Plymouth?
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.
