Grantham is located in Sullivan County, New Hampshire.
With 2 user-submitted readings averaging 12.50 pCi/L,
the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 03753 zip code.
12.50
pCi/L average
Above EPA Action Level
Based on 2 user-submitted radon tests for homes in Grantham, NH. The EPA recommends taking action at or above 4.0 pCi/L.
0
4.0 EPA
10+
Grantham, NH Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
Grantham, NH Radon Testing
Finding qualified radon testing professionals is the first step toward protecting your home.
Grantham, New Hampshire Radon Levels
User-submitted radon test readings from homes in the Grantham area.
Radon Level
City
Home Age
Foundation
Submitted
20 pCi/L
Grantham, NH
0-20 Years
No Basement/All Slab
Jun 2021
5 pCi/L
Grantham, NH
21-50 Years
Full Basement
Mar 2018
Have a radon test result for Grantham? Submit your reading to help other homeowners.
Grantham Radon Facts
Key details about the radon risk profile for Grantham and the 03753 zip code area.
EPA Radon Zone
Zone 2 — Moderate Risk
County
Sullivan County, NH
Zip Code
03753
Predicted Screening Level
2–4 pCi/L (Zone 2)
Avg. User Submitted Level
12.50 pCi/L
User Tests Submitted
2
Grantham and the 03753 zip code are located in Sullivan County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.
Radon FAQ for Grantham, NH
What is the average radon level in Grantham, NH?
Based on 2 user-submitted tests, the average radon level in Grantham is 12.50 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 Grantham in?
Grantham and the 03753 zip code are in Sullivan 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 Grantham?
Radon mitigation in Grantham 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 Grantham?
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 with the most user-submitted radon test data in the state.
