Loma Mar, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Loma Mar in?

Loma Mar is in San Mateo County, EPA Zone 2.

Q: How much does radon mitigation cost in Loma Mar?

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

San Mateo County

EPA Zone 2

Nestled in the Santa Cruz Mountains of San Mateo County, Loma Mar sits on complex geological formations where sedimentary rocks meet coastal terrain. Testing data for radon levels remains limited in this rural community (94021), making individual home testing especially important for residents. The mountainous terrain and varied soil conditions mean radon potential can differ significantly between properties in this scenic area.

Loma Mar, CA Radon Mitigation

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

Loma Mar, CA Radon Testing

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

Loma Mar Radon Facts

Key details about the radon risk profile for Loma Mar and the 94021 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

San Mateo County, CA

Zip Code

94021

Predicted Screening Level

2–4 pCi/L (Zone 2)

Loma Mar and the 94021 zip code are located in San Mateo 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 Loma Mar, CA

What EPA Radon Zone is Loma Mar in?

Loma Mar and the 94021 zip code are in San Mateo 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 Loma Mar?

Radon mitigation in Loma Mar 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 Loma Mar?

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