Penryn, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Penryn in?

Penryn is in Placer County, EPA Zone 2.

Q: How much does radon mitigation cost in Penryn?

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

Placer County

EPA Zone 2

Penryn in Placer County lies within the Sacramento metro area's Sierra Nevada foothills, where granite bedrock and gold-bearing formations create the geological foundation of the region. This historic community features homes ranging from older mining-era construction to modern suburban developments, many built on slab foundations typical of California's climate. Although radon testing data for zip code 95663 is currently limited, homeowners should consider testing given the area's granitic geology.

Penryn, CA Radon Mitigation

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

Penryn, CA Radon Testing

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

Penryn Radon Facts

Key details about the radon risk profile for Penryn and the 95663 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Placer County, CA

Zip Code

95663

Predicted Screening Level

2–4 pCi/L (Zone 2)

Penryn and the 95663 zip code are located in Placer 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 Penryn, CA

What EPA Radon Zone is Penryn in?

Penryn and the 95663 zip code are in Placer 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 Penryn?

Radon mitigation in Penryn 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 Penryn?

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