Coulterville, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Coulterville in?

Coulterville is in Mariposa County, EPA Zone 2.

Q: How much does radon mitigation cost in Coulterville?

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

Mariposa County

EPA Zone 2

Nestled in California's Mariposa County foothills, Coulterville sits in EPA Zone 2 for moderate radon potential in the Sierra Nevada region. The area's granite bedrock and gold country geology create conditions where radon levels can vary considerably, particularly in homes built into hillsides or with partial basements. Testing data for zip code 95311 is currently limited, encouraging residents to conduct radon measurements to understand their individual exposure levels.

Coulterville, CA Radon Mitigation

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

Coulterville, CA Radon Testing

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

Coulterville Radon Facts

Key details about the radon risk profile for Coulterville and the 95311 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Mariposa County, CA

Zip Code

95311

Predicted Screening Level

2–4 pCi/L (Zone 2)

Coulterville and the 95311 zip code are located in Mariposa 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 Coulterville, CA

What EPA Radon Zone is Coulterville in?

Coulterville and the 95311 zip code are in Mariposa 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 Coulterville?

Radon mitigation in Coulterville 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 Coulterville?

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 California

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

City	Avg User Radon Level	Submissions
Los Angeles	7.83 pCi/L	6
Mammoth Lakes	10.80 pCi/L	5
San Jose	4.20 pCi/L	5
Rancho Palos Verdes	8.00 pCi/L	4
Woodland Hills	7.67 pCi/L	3
South Lake Tahoe	6.33 pCi/L	3
Palos Verdes Peninsula	6.00 pCi/L	3
Bishop	5.67 pCi/L	3
Sacramento	4.33 pCi/L	3
Oakland	3.33 pCi/L	3
Fresno	10.00 pCi/L	2
Davis	8.00 pCi/L	2
Palo Alto	6.50 pCi/L	2
Studio City	6.50 pCi/L	2
Menlo Park	5.00 pCi/L	2
Truckee	5.00 pCi/L	2
Walnut Creek	4.00 pCi/L	2
San Diego	3.50 pCi/L	2
San Francisco	3.50 pCi/L	2
Belmont	20.00 pCi/L	1