Wellesley Island, NY Radon Mitigation and Testing

Q: What EPA Radon Zone is Wellesley Island in?

Wellesley Island is in Jefferson County, EPA Zone 2.

Q: How much does radon mitigation cost in Wellesley Island?

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

Jefferson County

EPA Zone 2

Situated in the St. Lawrence River within Jefferson County, this island community sits where Paleozoic limestone bedrock can contribute to radon gas formation beneath seasonal and year-round residential properties. Housing consists mainly of waterfront cottages and permanent homes, many with partial basements or crawl spaces due to the island's unique geography. With testing data for zip code 13640 currently unavailable, residents should conduct radon testing to assess potential exposure levels in this distinctive setting.

Wellesley Island, NY Radon Mitigation

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

Wellesley Island, NY Radon Testing

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

Wellesley Island Radon Facts

Key details about the radon risk profile for Wellesley Island and the 13640 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Jefferson County, NY

Zip Code

13640

Predicted Screening Level

2–4 pCi/L (Zone 2)

Wellesley Island and the 13640 zip code are located in Jefferson 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 Wellesley Island, NY

What EPA Radon Zone is Wellesley Island in?

Wellesley Island and the 13640 zip code are in Jefferson 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 Wellesley Island?

Radon mitigation in Wellesley Island 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 Wellesley Island?

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 York

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

City	Avg User Radon Level	Submissions
Brooklyn	10.80 pCi/L	5
Oneonta	6.50 pCi/L	4
Clifton Park	3.75 pCi/L	4
Elmira	15.00 pCi/L	3
Saugerties	10.67 pCi/L	3
Staten Island	4.00 pCi/L	3
New York	9.00 pCi/L	2
Yonkers	8.00 pCi/L	2
Horseheads	7.50 pCi/L	2
Poughkeepsie	16.00 pCi/L	1
Buffalo	4.00 pCi/L	1
Pelham	3.00 pCi/L	1