Castine, ME Radon Levels
Check local Castine radon levels and find certified testing and mitigation professionals to keep your home safe
Castine, ME Radon Facts
EPA Radon Zone
Zone 1 — High Risk
> 4.0 pCi/L (Zone 1)
County
Hancock County, ME
Zip Code
04421
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.
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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 in Maine with the most user-submitted radon test data, ranked by number of submissions.
| City | Avg User Radon Level | Submissions |
|---|---|---|
| Rumford | 6.00 pCi/L | 4 |
| 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 |