Richmond, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Richmond in?

Richmond is in Contra Costa County, EPA Zone 2.

Q: How much does radon mitigation cost in Richmond?

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

Contra Costa County

EPA Zone 2

Part of Contra Costa County in the San Francisco Metro area, Richmond (zip code 94801) sits on bay area geology where sedimentary deposits typically produce lower radon concentrations than inland regions. Testing data for this area remains limited, though California's coastal locations generally show reduced radon risk. Homeowners should still consider testing, particularly in older homes or those built on fill materials near the bay.

Richmond, CA Radon Mitigation

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

Richmond, CA Radon Testing

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

Richmond Radon Facts

Key details about the radon risk profile for Richmond and the 94801 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Contra Costa County, CA

Zip Code

94801

Predicted Screening Level

2–4 pCi/L (Zone 2)

Richmond and the 94801 zip code are located in Contra Costa 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 Richmond, CA

What EPA Radon Zone is Richmond in?

Richmond and the 94801 zip code are in Contra Costa 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 Richmond?

Radon mitigation in Richmond 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 Richmond?

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