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Property Intelligence for Multnomah County, OR
What public records reveal before you make an offer
Investigate a propertyWhat CaveatBuyer Analyzes in Multnomah County
For every property in Multnomah County, we pull from:
- ✓Multnomah County assessor (PortlandMaps)
- ✓City of Portland permit history
- ✓Oregon DEQ environmental cleanup sites
- ✓DOGAMI landslide and earthquake hazard maps
- ✓FEMA National Flood Hazard Layer
- ✓EPA Superfund, Brownfields, and Toxic Release Inventory
- ✓Oregon statewide radon zone mapping
- ✓Census Bureau geocoding and demographic data
- ✓Proprietary terrain and hazard analysis
Common Property Risks in Multnomah County
Based on when it was built
Pre-1940
- •Knob-and-tube wiring prevalent in inner Portland neighborhoods
- •Lead paint in pre-1978 housing stock
- •Unreinforced masonry buildings vulnerable to Cascadia subduction zone earthquake
1940s–1960s
- •Asbestos insulation in mid-century homes
- •Cast iron drain pipes approaching end of service life
- •Galvanized steel water lines with corrosion buildup
1970s–1990s
- •Polybutylene plumbing in some developments
- •Early energy-efficiency retrofits with inadequate ventilation
Based on where it sits
- •Cascadia subduction zone — magnitude 8–9 earthquakes on a 300–500 year cycle, with high liquefaction susceptibility in alluvial areas along the Willamette
- •DOGAMI-mapped landslide slopes in West Hills, SW Portland, and the Willamette Bluffs — earthquake-induced landslide risk overlaps residential areas
- •~1,800 unreinforced masonry (URM) buildings in Portland — highest collapse risk during a Cascadia event. Retrofit program remains voluntary
- •Flood zones along the Willamette and Columbia rivers — Johnson Creek and Fanno Creek corridors are particularly flood-prone
- •Portland Harbor Superfund site and DEQ cleanup sites along the Willamette’s east bank
- •SB 762 wildfire risk classifications in west hills and urban-wildland interface areas, requiring defensible space
Cities We Cover in Multnomah County
Other Oregon Markets
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