Yosemite National Park, CA Radon Levels

Q: What EPA Radon Zone is Yosemite National Park in?

Yosemite National Park is in Mariposa County, EPA Zone 2.

Q: How much does radon mitigation cost in Yosemite National Park?

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

Check local Yosemite National Park radon levels and find certified testing and mitigation professionals to keep your home safe

Yosemite National Park, CA Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Mariposa County, CA

Zip Code 95389

Within Mariposa County's Sierra Nevada foothills, Yosemite National Park encompasses granite formations and metamorphic rocks that typically produce lower radon levels than sedimentary regions. The limited residential structures in zip code 95389 consist primarily of park service housing and visitor facilities built to modern construction standards. Given the area's geological composition and limited testing data, radon levels are generally expected to be moderate, though testing remains advisable for residential structures.

Yosemite National Park, 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 Yosemite National Park, CA

What EPA Radon Zone is Yosemite National Park in?

Yosemite National Park and the 95389 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 Yosemite National Park?

Radon mitigation in Yosemite National Park 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 Yosemite National Park?

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