Fresno, CA Radon Levels

Q: What is the average radon level in Fresno, CA?

Based on 2 user-submitted tests, the average radon level is 10.00 pCi/L.

Q: What EPA Radon Zone is Fresno in?

Fresno is in Fresno County, EPA Zone 2.

Q: How much does radon mitigation cost in Fresno?

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

Check local Fresno radon levels and find certified testing and mitigation professionals to keep your home safe

Fresno, CA Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Fresno County, CA

Zip Code 93650

Avg. User Level 10.00 pCi/L

User Tests 2

Located in California's Central Valley within Fresno County, Fresno shows an average radon level of 10.0 pCi/L based on limited testing data, significantly exceeding the EPA action threshold of 4.0 pCi/L. This elevated reading is notable for EPA Zone 2, where alluvial soils typically produce moderate radon levels throughout the metro area. Residents across all Fresno zip codes should prioritize professional radon testing and consider mitigation systems for readings above 4 pCi/L.

10.00

pCi/L average

Above EPA Action Level

Based on 2 user-submitted radon tests for homes in Fresno, CA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Fresno, CA Radon Mitigation

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Fresno, CA Radon Levels

User-submitted radon test readings from homes in the Fresno area.

Radon Level	City	Home Age	Foundation
12 pCi/L	Fresno, CA	0-20 Years	No Basement/All Slab
8 pCi/L	Fresno, CA	21-50 Years	No Basement/All Slab

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Radon FAQ for Fresno, CA

What is the average radon level in Fresno, CA?

Based on 2 user-submitted tests, the average radon level in Fresno is 10.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Fresno in?

Fresno and the 93650 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 Fresno?

Radon mitigation in Fresno 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 Fresno?

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 in California with the most user-submitted radon test data, ranked by number of submissions.

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
Bishop	6.25 pCi/L	4
Oakland	5.00 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
Sacramento	4.33 pCi/L	3

Fresno, CA Radon Levels

Check local Fresno radon levels and find certified testing and mitigation professionals to keep your home safe

Fresno, CA Radon Facts

Fresno, CA Radon Mitigation

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Fresno, CA Radon Levels

Radon FAQ for Fresno, CA

Most Active Radon Markets in California

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