Santa Maria, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Santa Maria in?

Santa Maria is in Santa Barbara County, EPA Zone 1.

Q: How much does radon mitigation cost in Santa Maria?

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

Santa Barbara County

EPA Zone 1

Located in Santa Barbara County within the Santa Maria Valley, this agricultural community sits in EPA Zone 1 where radon levels are typically low due to coastal marine sediments and alluvial soils. Testing data for zip codes 93454, 93455, and 93458 is currently limited, making individual home testing especially important for residents. The area's mix of older ranch-style homes and newer developments means foundation types vary, and enclosed spaces can still accumulate radon regardless of regional geology.

Santa Maria, CA Radon Mitigation

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

Santa Maria, CA Radon Testing

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

Santa Maria Radon Facts

Key details about the radon risk profile for Santa Maria and the 93454 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Santa Barbara County, CA

Zip Code

93454

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Santa Maria and the 93454 zip code are located in Santa Barbara County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Santa Maria, CA

What EPA Radon Zone is Santa Maria in?

Santa Maria and the 93454 zip code are in Santa Barbara County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Santa Maria?

Radon mitigation in Santa Maria 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 Santa Maria?

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