Grantham, NH Radon Mitigation and Testing

Q: What is the average radon level in Grantham, NH?

Based on 2 user-submitted tests, the average radon level is 12.50 pCi/L.

Q: What EPA Radon Zone is Grantham in?

Grantham is in Sullivan County, EPA Zone 2.

Q: How much does radon mitigation cost in Grantham?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Avg: 12.50 pCi/L

Sullivan County

EPA Zone 2

2 user tests

Located in Sullivan County in New Hampshire's Upper Valley region, Grantham sits on glacial till deposits that contribute to elevated radon potential. Testing data from zip code 03753 shows an average radon level of 12.5 pCi/L, which significantly exceeds the EPA action level of 4.0 pCi/L. Given the area's geological conditions and these elevated readings, all Grantham homeowners should prioritize radon testing and mitigation if necessary.

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.

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

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.

City	Avg User Radon Level	Submissions
Tamworth	12.67 pCi/L	6
Freedom	10.75 pCi/L	4