Larchmont, NY Radon Mitigation and Testing

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

Based on 1 user-submitted tests, the average radon level is 7.00 pCi/L.

Q: What EPA Radon Zone is Larchmont in?

Larchmont is in Westchester County, EPA Zone 3.

Q: How much does radon mitigation cost in Larchmont?

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

Avg: 7.00 pCi/L

Westchester County

EPA Zone 3

1 user test

This affluent community in Westchester County within the New York City Metro area has recorded a notable radon reading of 7.0 pCi/L, well above the EPA action level. Despite being in a typically lower-risk EPA Zone 3, the 10538 area's mix of older homes built on varied geological formations can produce surprisingly elevated readings. Homeowners in Larchmont should prioritize testing, especially those with finished basements in the community's characteristic pre-war and mid-century housing stock.

7.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Larchmont, NY Radon Mitigation

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

Larchmont, NY Radon Testing

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

Larchmont, New York Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
7 pCi/L	Larchmont, NY	51-99 Years	—	Jun 2021

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

Larchmont Radon Facts

Key details about the radon risk profile for Larchmont and the 10538 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Westchester County, NY

Zip Code

10538

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Avg. User Submitted Level

7.00 pCi/L

User Tests Submitted

Larchmont and the 10538 zip code are located in Westchester 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 Larchmont, NY

What is the average radon level in Larchmont, NY?

Based on 1 user-submitted test, the average radon level in Larchmont is 7.00 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 Larchmont in?

Larchmont and the 10538 zip code are in Westchester 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 Larchmont?

Radon mitigation in Larchmont 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 Larchmont?

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