Mattawa, WA Radon Mitigation and Testing

Q: What EPA Radon Zone is Mattawa in?

Mattawa is in Grant County, EPA Zone 2.

Q: How much does radon mitigation cost in Mattawa?

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

Grant County

EPA Zone 2

Located in central Grant County along the Columbia River, Mattawa sits on basaltic bedrock and alluvial soils that generally produce moderate radon levels. With limited testing data for this 99349 zip code agricultural community, homeowners should prioritize independent radon assessment. The area's housing includes both traditional homes with basements and manufactured homes on various foundation types.

Mattawa, WA Radon Mitigation

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

Mattawa, WA Radon Testing

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

Mattawa Radon Facts

Key details about the radon risk profile for Mattawa and the 99349 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Grant County, WA

Zip Code

99349

Predicted Screening Level

2–4 pCi/L (Zone 2)

Mattawa and the 99349 zip code are located in Grant 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 Mattawa, WA

What EPA Radon Zone is Mattawa in?

Mattawa and the 99349 zip code are in Grant 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 Mattawa?

Radon mitigation in Mattawa 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 Mattawa?

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