Half Moon Bay, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Half Moon Bay in?

Half Moon Bay is in San Mateo County, EPA Zone 2.

Q: How much does radon mitigation cost in Half Moon Bay?

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

Located in San Mateo County along California's scenic Pacific coastline, Half Moon Bay sits on marine terraces and coastal sediments that generally produce low radon levels. While comprehensive radon testing data is currently limited for the 94019 area, homeowners should still consider testing given the variability in local geological conditions. Properties built on bluff areas or with basements may experience different radon conditions than typical coastal homes.

Half Moon Bay, CA Radon Mitigation

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

Half Moon Bay, CA Radon Testing

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

Half Moon Bay Radon Facts

Key details about the radon risk profile for Half Moon Bay and the 94019 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

San Mateo County, CA

Zip Code

94019

Predicted Screening Level

2–4 pCi/L (Zone 2)

Half Moon Bay and the 94019 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 Half Moon Bay, CA

What EPA Radon Zone is Half Moon Bay in?

Half Moon Bay and the 94019 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 Half Moon Bay?

Radon mitigation in Half Moon Bay 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 Half Moon Bay?

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