King County Brownfields Program


The King County Brownfields Program provides assistance to qualified private individuals and businesses, nonprofit organizations and municipalities within King County to assess and clean up contaminated sites, also known as Brownfields. A Brownfield site is defined by the U.S. Environmental Protection Agency as "real property, the expansion, redevelopment or reuse of which may be complicated by the presence or potential presence of a hazardous substance, pollutant or contaminant."

EPA Grants

Since 1998, the King County Solid Waste Division has received grant funds from the U.S. Environmental Protection Agency (EPA) to conduct environmental assessment and cleanup of contaminated brownfield properties in King County. These grant funds are used to hire consultants to conduct the assessment and cleanup work on behalf of public and nonprofit entities.

Purpose of Brownfields Project

The redevelopment of downtown Bothell was identified by the King County Brownfields Program as a priority Brownfields project; and in partnership with the City of Bothell, Phase I and Phase II Environmental Site Assessments (ESAs) were conducted in the downtown area between 2008 and 2009. The assessment area consisted of City-owned right-of-way (ROW) within and near the SR 522 and SR527 intersection. The purpose of these environmental studies was to characterize the nature and extent of soil and groundwater contamination associated with current and historical land uses within the project area. Prior research of historical businesses in the project area identified dry cleaners, gas stations, and other automotive facilities as potential sources of soil and groundwater contamination. The locations of these facilities were documented in a Report on Tax Parcel History prepared by the Environmental Coalition of South Seattle (ECOSS, 2008).

Environmental Assessments

In summer 2011, the King County Brownfields Program conducted environmental assessment work, which consisted of drilling activities, field investigations and laboratory analysis of groundwater samples collected from several properties located south of the City Hall block and east of Bothell Way NE.  King County Brownfields partnered with the City to help determine the extent of chlorinated solvent contamination impacts to groundwater originating from the former dry cleaner west of City Hall.  The results of this investigative work will go towards developing cleanup remedies for groundwater contamination.  (For more information, click on the Fact Sheets and environmental reports on the sidebar to the right.)

Understanding Contamination

The assistance provided by the King County Brownfields Program has helped the City to better understand the type of contamination that is present within the City ROW, and on adjacent properties. For more information please contact Lucy Auster, Senior Planner, King County Solid Waste Division, 206-296-8476,

Phase I Environmental Site Assessment

Phase II Environmental Site Assessment

Simon & Son Fine Drycleaning Phase I

Bothell Crossroads Redevelopment Project Phase II