Radon Mitigation in Portland, OR

Radon Mitigation in Portland: local conditions

Portland, OR sits on clay and silt in the Willamette Valley and has a wet marine climate with about 36–45" of rain a year in the valley. The local water table is high through the wet season, with mild winter freeze–thaw cycling, and basements and daylight basements are common on slopes. In practical terms, months of steady rain and high water tables keep basements and crawl spaces damp — which is exactly why radon mitigation is a common need here.

Basement Water Risk Index

52/100 — top factor: heavy precipitation (see how Portland ranks nationally)

Typical local cost

$950 – $3,550 for a standard project

Main local risk factor

Clay and silt in the willamette valley and mild winter freeze–thaw cycling

Permits

Structural foundation work in Portland generally requires a permit from the local building department; a licensed contractor pulls this for you.