Dunlap, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Dunlap in?

Dunlap is in Fresno County, EPA Zone 2.

Q: How much does radon mitigation cost in Dunlap?

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

Fresno County

EPA Zone 2

Located in Fresno County within the Central Valley, Dunlap sits at higher elevation in the Sierra Nevada foothills where granite bedrock and decomposed granite soils create unique geological conditions. Testing data for radon levels in zip code 93621 remains limited, making it essential for homeowners to conduct professional radon testing. Mountain communities like Dunlap can experience variable radon concentrations due to local geology and seasonal ventilation patterns.

Dunlap, CA Radon Mitigation

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

Dunlap, CA Radon Testing

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

Dunlap Radon Facts

Key details about the radon risk profile for Dunlap and the 93621 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Fresno County, CA

Zip Code

93621

Predicted Screening Level

2–4 pCi/L (Zone 2)

Dunlap and the 93621 zip code are located in Fresno 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 Dunlap, CA

What EPA Radon Zone is Dunlap in?

Dunlap and the 93621 zip code are in Fresno 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 Dunlap?

Radon mitigation in Dunlap 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 Dunlap?

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