Gresham, OR Radon Mitigation and Testing

Q: What EPA Radon Zone is Gresham in?

Gresham is in Multnomah County, EPA Zone 2.

Q: How much does radon mitigation cost in Gresham?

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

Multnomah County

EPA Zone 2

Located in eastern Multnomah County within the Portland metro area, Gresham's Columbia River Gorge geology typically produces moderate radon levels due to volcanic basalt formations. With limited testing data available for zip codes 97030 and 97080, residents should consider radon testing to establish baseline levels. Though classified as EPA Zone 2, individual homes can still experience elevated radon depending on specific geological and construction factors.

Gresham, OR Radon Mitigation

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

Gresham, OR Radon Testing

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

Gresham Radon Facts

Key details about the radon risk profile for Gresham and the 97030 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Multnomah County, OR

Zip Code

97030

Predicted Screening Level

2–4 pCi/L (Zone 2)

Gresham and the 97030 zip code are located in Multnomah 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 Gresham, OR

What EPA Radon Zone is Gresham in?

Gresham and the 97030 zip code are in Multnomah 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 Gresham?

Radon mitigation in Gresham 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 Gresham?

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 Oregon

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

City	Avg User Radon Level	Submissions
Corvallis	5.60 pCi/L	5
Astoria	9.25 pCi/L	4
La Grande	10.67 pCi/L	3
Bend	3.33 pCi/L	3
Salem	9.00 pCi/L	2
Eugene	7.00 pCi/L	2
Medford	7.00 pCi/L	1
Dundee	6.00 pCi/L	1
Ashland	4.00 pCi/L	1
Portland	4.00 pCi/L	1
Lincoln City	No submissions	0
West Linn	No submissions	0