Smithtown, NY Radon Mitigation and Testing

Q: What EPA Radon Zone is Smithtown in?

Smithtown is in Suffolk County, EPA Zone 3.

Q: How much does radon mitigation cost in Smithtown?

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

Suffolk County

EPA Zone 3

This Suffolk County community on Long Island sits within the New York City Metro area, where glacial deposits over sedimentary bedrock create generally lower radon conditions. Testing data for zip code 11787 remains limited, though the geological setting typically produces readings below EPA action levels. Smithtown's suburban housing stock, featuring both traditional Long Island construction and newer developments, benefits from occasional radon testing to establish baseline readings.

Smithtown, NY Radon Mitigation

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

Smithtown, NY Radon Testing

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

Smithtown Radon Facts

Key details about the radon risk profile for Smithtown and the 11787 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Suffolk County, NY

Zip Code

11787

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Smithtown and the 11787 zip code are located in Suffolk County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Smithtown, NY

What EPA Radon Zone is Smithtown in?

Smithtown and the 11787 zip code are in Suffolk County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

How much does radon mitigation cost in Smithtown?

Radon mitigation in Smithtown 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 Smithtown?

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