Castine, ME Radon Mitigation and Testing

Q: What EPA Radon Zone is Castine in?

Castine is in Hancock County, EPA Zone 1.

Q: How much does radon mitigation cost in Castine?

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

Hancock County

EPA Zone 1

This historic seaport in Hancock County sits on Maine's Penobscot Bay, where granite bedrock and glacial deposits create EPA Zone 1 conditions with elevated radon potential. Castine's distinctive housing includes many historic properties from the 1800s alongside newer coastal homes, with basement and crawl space foundations both common. Given the limited testing data available for zip code 04421, homeowners should prioritize radon testing regardless of their property's age or coastal location.

Castine, ME Radon Mitigation

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

Castine, ME Radon Testing

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

Castine Radon Facts

Key details about the radon risk profile for Castine and the 04421 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Hancock County, ME

Zip Code

04421

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Castine and the 04421 zip code are located in Hancock County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Castine, ME

What EPA Radon Zone is Castine in?

Castine and the 04421 zip code are in Hancock County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Castine?

Radon mitigation in Castine 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 Castine?

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 Maine

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Rumford	5.67 pCi/L	3
York	8.50 pCi/L	2
Saco	7.50 pCi/L	2
Hampden	4.50 pCi/L	2
Scarborough	14.00 pCi/L	1
Kittery	12.00 pCi/L	1
South Portland	10.00 pCi/L	1
Portland	4.00 pCi/L	1