Holtsville, NY Radon Mitigation and Testing

Q: What is the average radon level in Holtsville, NY?

Based on 1 user-submitted tests, the average radon level is 5.00 pCi/L.

Q: What EPA Radon Zone is Holtsville in?

Holtsville is in Suffolk County, EPA Zone 3.

Q: How much does radon mitigation cost in Holtsville?

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

Avg: 5.00 pCi/L

Suffolk County

EPA Zone 3

1 user test

Holtsville in Suffolk County has recorded an elevated average radon level of 5.0 pCi/L, exceeding the EPA action threshold and warranting professional mitigation consideration. This New York City Metro community in zip code 11742 sits on Long Island's glacial outwash deposits over Cretaceous formations, geological conditions that can create variable radon accumulation depending on soil permeability and water table fluctuations. Homeowners should prioritize testing and mitigation consultation given these concerning levels in the area's suburban housing stock.

5.00

pCi/L average

Above EPA Action Level

Based on 1 user-submitted radon test for homes in Holtsville, NY. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Holtsville, NY Radon Mitigation

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

Holtsville, NY Radon Testing

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

Holtsville, New York Radon Levels

User-submitted radon test readings from homes in the Holtsville area.

Radon Level	City	Home Age	Foundation	Submitted
5 pCi/L	Holtsville, NY	—	Full Basement	Apr 2023

Have a radon test result for Holtsville? Submit your reading to help other homeowners.

Holtsville Radon Facts

Key details about the radon risk profile for Holtsville and the 11742 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Suffolk County, NY

Zip Code

11742

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Avg. User Submitted Level

5.00 pCi/L

User Tests Submitted

Holtsville and the 11742 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 Holtsville, NY

What is the average radon level in Holtsville, NY?

Based on 1 user-submitted test, the average radon level in Holtsville is 5.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Holtsville in?

Holtsville and the 11742 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 Holtsville?

Radon mitigation in Holtsville 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 Holtsville?

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