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Mendham, NJ Radon Levels

Check local Mendham radon levels and find certified testing and mitigation professionals to keep your home safe


Mendham, NJ Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)
County Morris County, NJ
Zip Code 07945
Avg. User Level 5.00 pCi/L
User Tests 2

Nestled in Morris County within the New York City metro area, Mendham has recorded an average radon level of 5.0 pCi/L, which exceeds the EPA action level of 4.0 pCi/L. The community sits in EPA Zone 1, reflecting high radon potential due to the region's granite bedrock and glacial deposits. Homeowners in zip code 07945 should prioritize radon testing and mitigation, especially in properties with basements or lower-level living areas.

5.00
pCi/L average
Above EPA Action Level

Based on 2 user-submitted radon tests for homes in Mendham, NJ. The EPA recommends taking action at or above 4.0 pCi/L.

0
4.0 EPA
10+

Mendham, NJ Radon Mitigation

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

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Mendham, NJ Radon Levels

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

Radon LevelCityHome AgeFoundation
5 pCi/L Mendham, NJ 100+ Years Partial Basement

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

Radon FAQ for Mendham, NJ

What is the average radon level in Mendham, NJ?
Based on 2 user-submitted tests, the average radon level in Mendham 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 Mendham in?
Mendham and the 07945 zip code are in Morris 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 Mendham?
Radon mitigation in Mendham 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 Mendham?
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 Jersey

Cities in New Jersey with the most user-submitted radon test data, ranked by number of submissions.

CityAvg User Radon LevelSubmissions
Cherry Hill 6.44 pCi/L 9
Hillsborough 6.14 pCi/L 7
Freehold 10.50 pCi/L 6
Marlboro 6.17 pCi/L 6
Bernardsville 7.00 pCi/L 5
Phillipsburg 7.00 pCi/L 5
Edison 5.60 pCi/L 5
Princeton 5.40 pCi/L 5
Sussex 9.75 pCi/L 4
Piscataway 6.75 pCi/L 4