Waterville, WA Radon Mitigation and Testing

Q: What EPA Radon Zone is Waterville in?

Waterville is in Douglas County, EPA Zone 2.

Q: How much does radon mitigation cost in Waterville?

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

Douglas County

EPA Zone 2

Found in Douglas County in central Washington, Waterville sits within the Columbia Plateau where basaltic geology generally produces lower radon levels. However, testing data for zip code 98858 remains limited, making individual assessment valuable for homeowners. The region's agricultural setting and varied construction types still warrant radon testing consideration.

Waterville, WA Radon Mitigation

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

Waterville, WA Radon Testing

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

Waterville Radon Facts

Key details about the radon risk profile for Waterville and the 98858 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Douglas County, WA

Zip Code

98858

Predicted Screening Level

2–4 pCi/L (Zone 2)

Waterville and the 98858 zip code are located in Douglas 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 Waterville, WA

What EPA Radon Zone is Waterville in?

Waterville and the 98858 zip code are in Douglas 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 Waterville?

Radon mitigation in Waterville 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 Waterville?

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