Grass Valley, CA Radon Mitigation and Testing

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

Based on 2 user-submitted tests, the average radon level is 11.50 pCi/L.

Q: What EPA Radon Zone is Grass Valley in?

Grass Valley is in Nevada County, EPA Zone 2.

Q: How much does radon mitigation cost in Grass Valley?

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

Avg: 11.50 pCi/L

Nevada County

EPA Zone 2

2 user tests

Grass Valley is located in Nevada County, California. With 2 user-submitted readings averaging 11.50 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 95945 zip code.

11.50

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Grass Valley, CA Radon Mitigation

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

Grass Valley, CA Radon Testing

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

Grass Valley, California Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
10 pCi/L	Grass Valley, CA	0-20 Years	Partial Basement	Oct 2024
13 pCi/L	Grass Valley, CA	0-20 Years	No Basement/All Slab	Feb 2021

Have a radon test result for Grass Valley? Submit your reading to help other homeowners.

Grass Valley Radon Facts

Key details about the radon risk profile for Grass Valley and the 95945 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Nevada County, CA

Zip Code

95945

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

11.50 pCi/L

User Tests Submitted

Grass Valley and the 95945 zip code are located in Nevada 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 Grass Valley, CA

What is the average radon level in Grass Valley, CA?

Based on 2 user-submitted tests, the average radon level in Grass Valley is 11.50 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 Grass Valley in?

Grass Valley and the 95945 zip code are in Nevada 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 Grass Valley?

Radon mitigation in Grass Valley 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 Grass Valley?

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