Angwin, CA Radon Levels

Q: What EPA Radon Zone is Angwin in?

Angwin is in Napa County, EPA Zone 3.

Q: How much does radon mitigation cost in Angwin?

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

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

Angwin, CA Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County Napa County, CA

Zip Code 94508

Elevated within Napa County's eastern hills, Angwin sits over diverse geological formations including volcanic deposits and sedimentary rocks that can create variable radon conditions. The community's housing includes both academic institution buildings and residential construction adapted to the mountainous terrain. Since radon testing data for zip code 94508 is currently limited, residents should consider professional assessment, particularly for homes with lower-level spaces that might concentrate radon gas.

Angwin, 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 Angwin, CA

What EPA Radon Zone is Angwin in?

Angwin and the 94508 zip code are in Napa 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 Angwin?

Radon mitigation in Angwin 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 Angwin?

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