Rancho Cucamonga, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Rancho Cucamonga in?

Rancho Cucamonga is in San Bernardino County, EPA Zone 2.

Q: How much does radon mitigation cost in Rancho Cucamonga?

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

San Bernardino County

EPA Zone 2

Nestled against the San Gabriel Mountains in San Bernardino County, Rancho Cucamonga's multiple zip codes (91701, 91730, 91737, 91739) within the Riverside Metro area currently lack comprehensive radon testing data. The city's location near granite mountain ranges and alluvial fan deposits can create variable radon conditions across different neighborhoods. Professional radon testing is recommended to establish baseline readings, particularly in homes built on or near the mountain foothills.

Rancho Cucamonga, CA Radon Mitigation

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

Rancho Cucamonga, CA Radon Testing

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

Rancho Cucamonga Radon Facts

Key details about the radon risk profile for Rancho Cucamonga and the 91701 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

San Bernardino County, CA

Zip Code

91701

Predicted Screening Level

2–4 pCi/L (Zone 2)

Rancho Cucamonga and the 91701 zip code are located in San Bernardino 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 Rancho Cucamonga, CA

What EPA Radon Zone is Rancho Cucamonga in?

Rancho Cucamonga and the 91701 zip code are in San Bernardino 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 Rancho Cucamonga?

Radon mitigation in Rancho Cucamonga 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 Rancho Cucamonga?

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