Rowland Heights, CA Radon Mitigation and Testing

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.

Los Angeles County

EPA Zone 2

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.

Rowland Heights, CA Radon Testing

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

Rowland Heights Radon Facts

Key details about the radon risk profile for Rowland Heights and the 91748 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Los Angeles County, CA

Zip Code

91748

Predicted Screening Level

2–4 pCi/L (Zone 2)

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