Washington › King County
Property Intelligence for King County, WA
What public records reveal before you make an offer
Investigate a propertyWhat CaveatBuyer Analyzes in King County
For every property in King County, we pull from:
- ✓King County Assessor records (property details, tax history, sales)
- ✓King County GIS ArcGIS REST (parcel geometry, zoning, land use)
- ✓Seattle SDCI permits (building, electrical, mechanical, plumbing)
- ✓King County landslide and steep slope hazard zones
- ✓King County liquefaction susceptibility areas
- ✓FEMA National Flood Hazard Layer (NFHL)
- ✓EPA Superfund, Brownfields, and Toxic Release Inventory
- ✓WA DNR statewide geology (fault lines, slide-prone formations)
- ✓WA Department of Ecology well logs
- ✓WA dam safety inventory
- ✓SPU sewer classification and septic areas (Seattle)
- ✓Seattle City Light service area and energy data
- ✓Census Bureau geocoding and demographic data
- ✓Proprietary terrain and hazard analysis
- ✓Walk Score transit and walkability indexes
Common Property Risks in King County
Based on when it was built
Pre-1940
- •Knob-and-tube wiring behind finished walls
- •Cast iron drain pipes nearing end of life
- •Original plaster walls concealing outdated systems
- •Lead paint on interior and exterior surfaces
1940s–1960s
- •Asbestos insulation in attics, pipe wrap, and floor tiles
- •Galvanized steel water pipes prone to corrosion and low flow
- •Oil-fired heating systems with potential buried tanks
1970s–1980s
- •Aluminum wiring in some homes (fire risk at connections)
- •Early forced-air HVAC systems aging out of service life
- •Polybutylene plumbing in some developments
Based on where it sits
- •Landslide-prone slopes in West Seattle, Magnolia, and Beacon Hill — over 1,500 mapped hazard areas countywide
- •Seattle Fault Zone running east-west through downtown — magnitude 7+ earthquake risk with tsunami exposure along Elliott Bay
- •Liquefaction zones in fill areas near the Duwamish River, including SoDo, Georgetown, and the Rainier Valley
- •Flood zones along the Green River, Cedar River, and Sammamish River corridors
- •Environmentally Critical Areas (ECAs) with steep slopes, wetlands, and stream buffers restricting development
- •Duwamish Waterway Superfund site and Harbor Island industrial contamination
- •Historic coal mine voids in Newcastle and Renton Highlands — subsidence risk over former workings
Cities We Cover in King County
Other Washington Markets
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