Site Register & contaminated sites lists

On this page you can find our:

  • Site Register — Information about formal and independent cleanups, including opportunities for public comment and attending public meetings, and policy updates.
  • Hazardous Sites List — All sites that have been assessed and ranked using the Washington Ranking Method as well as National Priorities List sites.
  • Toxics Cleanup Web Reporting tool — A searchable database providing a selection of reports and data sets, including lists of Environmental Covenants Registry sites, Confirmed and Suspected Contaminated sites, No Further Action sites, regulated Underground Storage Tank sites, and Leaking Underground Storage Tank sites.

Site Register

The Site Register, a bi-monthly publication, is an update of cleanup activities. It provides information about public meetings, public comment periods, and cleanup-related reports. One of our goals is to provide timely information to the public about the cleanup of contaminated sites and meaningful opportunities for participation in that process. One tool we use to meet this goal is the Site Register. You can find more information in the Site Register Focus Sheet.

For more information, please contact Cheryl Ann Bishop 360-407-6848 or

Hazardous Sites List

We publish the Hazardous Sites List as required by law (WAC 173-340-330). The list includes all sites that have been assessed and ranked using the Washington Ranking Method, as well as National Priorities List sites. We update the list twice a year. The Hazardous Sites List is only available online at this time.

Additions to the list, changes in remedial status of sites on the list, and removals from the list are published twice a year. Placement of a site on the list does not, by itself, imply that people associated with the site are liable under Chapter 70.105D RCW. Refer to the list for additional information about a specific site.

Toxics Cleanup Web Reporting

We work to clean up contaminated properties throughout Washington. Cleanup projects vary greatly in size and complexity. Some are small and routine (for example, cleaning up contamination from Leaking Underground Storage Tanks). Many cleanups are large, complex projects that require engineered solutions. In addition, Ecology regulates more than 11,000 underground storage tanks at more than 4,000 facilities (both private businesses and public entities). We work to ensure that these tanks are installed, managed, and monitored in a way that prevents releases into the environment.

This "portal" provides a selection of reports and datasets. It is intended to help you quickly retrieve subsets of data for your particular areas of interest. The reports draw data from these environmental databases:

  • The Integrated Site Information System: helps us prioritize our work and track cleanup progress. (Cleanup site address and location data are drawn from our Facility/Site database.)
  • The Underground Storage Tank System: a repository of information about facilities that have Underground Storage Tanks that are regulated on their premises.

You can find the following types of information via our Toxics Cleanup Web Reporting tool.

Environmental Covenants Registry (July 2008)

The Environmental Covenants Registry is a list of sites that have residual contamination remaining on them after the cleanup has been completed. These sites have environmental covenants or deed restrictions limiting certain uses of the property. Example covenants would be those prohibiting the drilling of a water supply well on the property or use of the property for residential uses.

Confirmed & Suspected Contaminated Sites

This report contains information about sites that are undergoing cleanup and sites that are awaiting further investigation and/or cleanup. Sites on the Hazardous Sites List (see above) are included in this data set.

No Further Action Sites list

This data set contains information about sites previously on the Confirmed and Suspected Contaminated Sites list (above) that have received a No Further Action (NFA) decision.

Regulated Underground Storage Tanks

Washington state regulates more than 11,000 active tanks on approximately 4,500 different properties, including gas stations, industries, commercial properties, and governmental sites. The regulated Underground Storage Tanks (USTs) report contains information on both operational and closed USTs.

Leaking Underground Storage Tanks list

The Leaking Underground Storage Tanks (LUST) report contains information on UST facilities that require cleanup and their cleanup history.

Additional LUST data are available from:

U.S. Environmental Protection Agency, Region X, Seattle
800-424-4EPA or 206-553-1200

Voluntary Cleanup Program

Here you can find the Voluntary Cleanup Program wait list.