Certified Radon Mitigators
in Portland, Oregon

Portland and the surrounding metro sit in the Willamette Valley between the Coast Range and the Cascades, where basalt, tuff, and alluvial valley fill create generally moderate radon conditions compared to the Rocky Mountain states. Oregon's statewide average is around 2.0 pCi/L, and Portland is EPA Zone 2 — but northeast Portland, outer east Portland, and hillside neighborhoods in Southwest Portland and Lake Oswego sit on different geology and test above the action level more frequently than the metro average suggests. Washington County to the west (Hillsboro, Beaverton, Forest Grove) has historically shown higher average readings than Multnomah County. Oregon doesn't require state radon contractor licensing, making independent NRPP or NRSB verification essential.