Prosser, WA Radon Mitigation and Testing

Q: What EPA Radon Zone is Prosser in?

Prosser is in Benton County, EPA Zone 2.

Q: How much does radon mitigation cost in Prosser?

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

Benton County

EPA Zone 2

Positioned in Benton County along the Columbia River valley, Prosser benefits from the region's agricultural heritage while sitting on alluvial soils over Columbia River basalt formations that generally produce lower radon levels. The community's housing stock includes both historic farmhouses and modern residential developments, with many homes featuring basement or crawl space foundations. Since specific radon testing data for zip code 99350 is currently unavailable, residents should consider professional testing to establish their individual home's radon profile.

Prosser, WA Radon Mitigation

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

Prosser, WA Radon Testing

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

Prosser Radon Facts

Key details about the radon risk profile for Prosser and the 99350 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Benton County, WA

Zip Code

99350

Predicted Screening Level

2–4 pCi/L (Zone 2)

Prosser and the 99350 zip code are located in Benton 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 Prosser, WA

What EPA Radon Zone is Prosser in?

Prosser and the 99350 zip code are in Benton 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 Prosser?

Radon mitigation in Prosser 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 Prosser?

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