Marlborough, NH Radon Mitigation and Testing

Q: What EPA Radon Zone is Marlborough in?

Marlborough is in Cheshire County, EPA Zone 2.

Q: How much does radon mitigation cost in Marlborough?

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

Cheshire County

EPA Zone 2

Established in Cheshire County among New Hampshire's Monadnock region hills, Marlborough sits on granite and metamorphic bedrock formations known for producing elevated radon levels throughout the state. The area's housing includes both 18th-century colonial homes and contemporary construction, many featuring traditional New England basements where radon can concentrate significantly. Although specific testing data for zip code 03455 remains limited, the geological characteristics strongly suggest that homeowners should conduct professional radon assessments.

Marlborough, NH Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Marlborough, NH Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Marlborough Radon Facts

Key details about the radon risk profile for Marlborough and the 03455 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Cheshire County, NH

Zip Code

03455

Predicted Screening Level

2–4 pCi/L (Zone 2)

Marlborough and the 03455 zip code are located in Cheshire 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 Marlborough, NH

What EPA Radon Zone is Marlborough in?

Marlborough and the 03455 zip code are in Cheshire 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 Marlborough?

Radon mitigation in Marlborough 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 Marlborough?

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