Need a Phase I or Phase II ESA in King County, WA? King County has about 2,340,211 residents (2024 estimate) and 38 incorporated cities and towns. Describe your project once: environmental consultants who work in King County get back to you.
State environmental agency records for King County are part of what the consultant reviews.
Services available in King County
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Phase I Environmental Site Assessment
Records review, site visit and interviews to ASTM E1527 by an Environmental Professional, for a purchase or a loan.
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Phase II Environmental Site Assessment
Soil, groundwater or vapor sampling when a Phase I identifies a recognized environmental condition.
Frequently asked questions in King County
Do environmental consultants cover the whole of King County?
Most pros work across the county and neighboring counties. Enter your ZIP code in the form and we match you with pros who serve your exact area.
Phase I Environmental Site Assessment in Washington: all counties
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.