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Radon Levels, Testing and Mitigation in Oregon

Oregon has 36 counties, with 0 classified as EPA Zone 1 (highest risk). With an average radon level of 6.91 pCi/L, Oregon state testing data reveals significantly elevated risks across multiple counties. Testing is highly recommended.

Oregon is the 9th largest state in terms of size and the 27th most populous in the entire US.

Oregon does have an active radon program, dedicated to educating citizens about the risks associated with the deadly gas. You can find more information on Radon, testing and mitigation at the official page.

6.91
Avg. pCi/L
36
Counties
Zone 1 Counties

Oregon Radon Map

Oregon radon levels by county
Zone 1 — High
Zone 2 — Moderate
Zone 3 — Low

Oregon Metro Areas

Explore radon data organized by metro region, including average levels, hotspot cities, and local mitigation professionals.

Bend Metro
5 cities
Eugene Metro
5 cities
Medford Metro
5 cities
Portland Metro
5 cities
Salem Metro
5 cities

Most Active Radon Markets in Oregon

Cities with the most user-submitted radon test data, ranked by number of submissions.

CityAvg User Radon LevelSubmissions
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

Oregon Counties by EPA Radon Zone

All 36 Oregon counties with their EPA radon zone classification and user-submitted average radon levels.

Zone 2 — Moderate Risk
Predicted avg. indoor levels 2–4 pCi/L
Zone 2 21 counties
Baker County Zone 2
Avg: 7.0 pCi/L
Clatsop County Zone 2
Avg: 9.3 pCi/L
Columbia County Zone 2
Avg:
Crook County Zone 2
Avg:
Gilliam County Zone 2
Avg:
Grant County Zone 2
Avg:
Harney County Zone 2
Avg:
Hood River County Zone 2
Avg:
Jefferson County Zone 2
Avg:
Klamath County Zone 2
Avg:
Lake County Zone 2
Avg:
Malheur County Zone 2
Avg:
Morrow County Zone 2
Avg:
Multnomah County Zone 2
Avg:
Sherman County Zone 2
Avg:
Umatilla County Zone 2
Avg: 20.0 pCi/L
Union County Zone 2
Avg: 11.3 pCi/L
Wasco County Zone 2
Avg: 14.0 pCi/L
Washington County Zone 2
Avg: 4.3 pCi/L
Wheeler County Zone 2
Avg:
Yamhill County Zone 2
Avg: 6.6 pCi/L
Zone 3 — Low Risk
Predicted avg. indoor levels < 2 pCi/L
Zone 3 15 counties
Benton County Zone 3
Avg: 5.7 pCi/L
Clackamas County Zone 3
Avg: 4.0 pCi/L
Coos County Zone 3
Avg: 7.0 pCi/L
Curry County Zone 3
Avg: 1.0 pCi/L
Deschutes County Zone 3
Avg: 6.6 pCi/L
Douglas County Zone 3
Avg: 20.0 pCi/L
Jackson County Zone 3
Avg: 5.5 pCi/L
Josephine County Zone 3
Avg:
Lane County Zone 3
Avg: 7.0 pCi/L
Lincoln County Zone 3
Avg:
Linn County Zone 3
Avg:
Marion County Zone 3
Avg: 5.8 pCi/L
Polk County Zone 3
Avg: 3.0 pCi/L
Tillamook County Zone 3
Avg: 5.0 pCi/L
Wallowa County Zone 3
Avg:

Oregon Cities & Towns

Browse radon data for individual cities across Oregon. Each city page includes user-submitted radon levels, local contractors, and mitigation resources.

Adams Adrian Agness Albany Alsea Amity Antelope Arch Cape Arlington Ashland Ashwood Astoria Athena Aumsville Aurora Azalea Baker City Bandon Banks Bates Bay City Beatty Beaver Beavercreek Beaverton Bend Blachly Blodgett Blue River Boardman Bonanza Boring Bridgeport Brightwood Broadbent Brogan Brookings Brothers Brownsville Burns Butte Falls Buxton Camas Valley Camp Sherman Canby Canyon City Canyonville Carlton Cascade Locks Cascadia Cave Junction Central Point Chemult Cheshire Chiloquin Clackamas Clatskanie Cloverdale Colton Columbia City Condon Coos Bay Coquille Corbett Cornelius Corvallis Cottage Grove Cove Crescent Creswell Culp Creek Culver Dairy Dallas Damascus Days Creek Dayton Dayville Deadwood Deer Island Depoe Bay Detroit Dexter Diamond Donald Dorena Drain Drewsey Dufur Dundee Eagle Creek Eagle Point Echo Eddyville Elgin Elkton Elmira Enterprise Estacada Eugene Fairview Fall Creek Falls City Fields Florence Forest Grove Fossil Foster Frenchglen Gales Creek Gardiner Gaston Gates Gervais Gilchrist Gladstone Glendale Glide Gold Beach Gold Hill Government Camp Grand Ronde Grants Pass Grass Valley Gresham Haines Halfway Halsey Hammond Happy Valley Harper Harrisburg Hebo Helix Heppner Hereford Hermiston Hillsboro Hines Hood River Hubbard Huntington Idanha Idleyld Park Imbler Imnaha Independence Ione Ironside Irrigon Jacksonville Jamieson Jefferson John Day Jordan Valley Joseph Junction City Juntura Keno Kerby Kimberly Klamath Falls La Grande La Pine Lafayette Lake Oswego Lakeside Lakeview Langlois Lebanon Lexington Lincoln City Logsden Long Creek Lorane Lostine Lowell Lyons Madras Malin Manning Mapleton Marcola Maupin Mcminnville Medford Merlin Merrill Mikkalo Mill City Milton Freewater Mitchell Molalla Monmouth Monroe Monument Moro Mosier Mount Angel Mount Hood Parkdale Mount Vernon Mulino Myrtle Creek Myrtle Point Nehalem Neotsu Neskowin New Pine Creek Newberg Newport North Bend North Plains North Powder Noti Nyssa O Brien Oakland Oakridge Ontario Oregon City Otis Otter Rock Oxbow Paisley Paulina Pendleton Philomath Phoenix Pilot Rock Pleasant Hill Plush Port Orford Portland Post Powell Butte Powers Prairie City Princeton Prineville Prospect Rainier Redmond Reedsport Rhododendron Richland Rickreall Riddle Riley Riverside Rockaway Beach Rogue River Rose Lodge Roseburg Saint Helens Saint Paul Salem Sandy Scappoose Scio Scotts Mills Scottsburg Seal Rock Seaside Selma Seneca Shady Cove Shedd Sheridan Sherwood Siletz Silver Lake Silverton Sisters Sixes South Beach Sprague River Spray Springfield Stanfield Stayton Sublimity Summer Lake Summerville Sumpter Sutherlin Sweet Home Swisshome Talent Tangent Tenmile Terrebonne The Dalles Thurston Tidewater Tillamook Tiller Timber Toledo Trail Troutdale Tualatin Turner Tygh Valley Umatilla Umpqua Union Unity Vale Veneta Vernonia Vida Waldport Wallowa Walterville Walton Warren Warrenton Wasco Welches West Linn Westfir Westlake Weston White City Wilderville Willamina Williams Wilsonville Winchester Winston Wolf Creek Woodburn Yachats Yamhill Yoncalla

Frequently Asked Questions About Radon in Oregon

What radon level is considered "high"?
The EPA action level is 4.0 pCi/L — many homeowners also choose to fix levels between 2.0 and 4.0 pCi/L. Any home with levels at or above 4.0 pCi/L should be mitigated.
How much does radon mitigation cost in Oregon?
Radon mitigation typically costs between $800 and $2,500, depending on foundation type and radon severity. A standard sub-slab depressurization system usually falls in the $1,000–$1,500 range.
Does mitigation actually work?
Yes — properly installed systems typically reduce radon levels by up to 99%. A post-mitigation test confirms the system is working correctly, and many homeowners re-test periodically.
Should I test again after mitigation?
Yes. A post-mitigation test is the proof your system is working. The EPA recommends testing within 30 days of installation and retesting every two years.
What EPA Radon Zone is my Oregon county in?
Oregon counties are classified into three EPA Radon Zones. Zone 1 (highest risk, >4 pCi/L) indicates the most concern. Zone 2 (moderate, 2–4 pCi/L) and Zone 3 (lowest, <2 pCi/L) round out the classification. Use the county directory above to find your specific county's zone and data.

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