Coulterville, CA Radon Levels
Check local Coulterville radon levels and find certified testing and mitigation professionals to keep your home safe
Coulterville, CA Radon Facts
EPA Radon Zone
Zone 2 — Moderate Risk
2–4 pCi/L (Zone 2)
County
Mariposa County, CA
Zip Code
95311
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.
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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 in California with the most user-submitted radon test data, ranked by number of submissions.
| 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 |
| Bishop | 6.25 pCi/L | 4 |
| Oakland | 5.00 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 |
| Sacramento | 4.33 pCi/L | 3 |