Rancho Cucamonga, CA Radon Levels
Check local Rancho Cucamonga radon levels and find certified testing and mitigation professionals to keep your home safe
Rancho Cucamonga, CA Radon Facts
EPA Radon Zone
Zone 2 — Moderate Risk
2–4 pCi/L (Zone 2)
County
San Bernardino County, CA
Zip Code
91701
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.
Need Radon Mitigation or Testing in Rancho Cucamonga?
- 100% Free, No-Obligation Quotes
- Matches You with State-Licensed San Bernardino County Pros
1-800-299-3578
Toll-free · Mon–Fri 8am–6pm ET
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 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 |