Ridgefield, WA Radon Mitigation and Testing

Q: What is the average radon level in Ridgefield, WA?

Based on 1 user-submitted tests, the average radon level is 5.00 pCi/L.

Q: What EPA Radon Zone is Ridgefield in?

Ridgefield is in Clark County, EPA Zone 1.

Q: How much does radon mitigation cost in Ridgefield?

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

Avg: 5.00 pCi/L

Clark County

EPA Zone 1

1 user test

Ridgefield in Clark County recorded an average radon level of 5.0 pCi/L, which exceeds the EPA action threshold of 4.0 pCi/L. This Portland Metro community sits on Columbia River volcanic deposits that can concentrate radon gas in residential foundations. Given this elevated reading from zip code 98642, homeowners should prioritize professional radon testing and consider mitigation if levels exceed EPA guidelines.

5.00

pCi/L average

Above EPA Action Level

Based on 1 user-submitted radon test for homes in Ridgefield, WA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Ridgefield, WA Radon Mitigation

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

Ridgefield, WA Radon Testing

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

Ridgefield, Washington Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
5 pCi/L	Ridgefield, WA	21-50 Years	—	May 2018

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

Ridgefield Radon Facts

Key details about the radon risk profile for Ridgefield and the 98642 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Clark County, WA

Zip Code

98642

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

5.00 pCi/L

User Tests Submitted

Ridgefield and the 98642 zip code are located in Clark 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 Ridgefield, WA

What is the average radon level in Ridgefield, WA?

Based on 1 user-submitted test, the average radon level in Ridgefield is 5.00 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 Ridgefield in?

Ridgefield and the 98642 zip code are in Clark 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 Ridgefield?

Radon mitigation in Ridgefield 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 Ridgefield?

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 Washington

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Vancouver	6.56 pCi/L	9
Kent	3.60 pCi/L	5
Seattle	5.25 pCi/L	4
Olympia	5.00 pCi/L	4
Bellevue	3.75 pCi/L	4
Spokane	11.67 pCi/L	3
Camas	8.00 pCi/L	3
Centralia	7.00 pCi/L	3
Bellingham	4.50 pCi/L	2
Kirkland	4.50 pCi/L	2
Washougal	8.00 pCi/L	1
Ridgefield	5.00 pCi/L	1
Moses Lake	No submissions	0