Rowland Heights, CA Radon Levels

Q: What EPA Radon Zone is Rowland Heights in?

Rowland Heights is in Los Angeles County, EPA Zone 2.

Q: How much does radon mitigation cost in Rowland Heights?

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

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

Rowland Heights, CA Radon Facts

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

County Los Angeles County, CA

Zip Code 91748

Nestled in Los Angeles County's San Gabriel Valley, Rowland Heights sits on alluvial fan deposits from nearby mountains, creating generally moderate radon conditions typical of Southern California's foothill communities. The 91748 zip code features predominantly single-family homes built from the 1960s onward, most with concrete slab foundations reflecting the region's mild climate and earthquake considerations. Without current testing data available, homeowners should consider radon measurements, particularly in hillside properties where geological variations can create localized elevated readings.

Rowland Heights, 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 Rowland Heights, CA

What EPA Radon Zone is Rowland Heights in?

Rowland Heights and the 91748 zip code are in Los Angeles 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 Rowland Heights?

Radon mitigation in Rowland Heights 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 Rowland Heights?

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