Riverside, CA Radon Levels

Q: What EPA Radon Zone is Riverside in?

Riverside is in Riverside County, EPA Zone 2.

Q: How much does radon mitigation cost in Riverside?

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

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

Riverside, CA Radon Facts

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

County Riverside County, CA

Zip Code 92501

Positioned in the heart of Riverside County within the Inland Empire, Riverside sits on alluvial fan deposits from the San Bernardino Mountains, which generally create low-to-moderate radon conditions throughout the region. The city features diverse housing from historic Mission Revival architecture to modern suburban tracts, predominantly built with slab-on-grade foundations typical of Southern California construction. While comprehensive radon testing data for zip codes 92501 and 92503 remains limited, the geological setting typically produces lower radon levels, though testing is still beneficial for peace of mind.

Riverside, 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 Riverside, CA

What EPA Radon Zone is Riverside in?

Riverside and the 92501 zip code are in Riverside 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 Riverside?

Radon mitigation in Riverside 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 Riverside?

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