Underground Storage Tanks

Washington State Department of Ecology

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Underground Storage Tanks (USTs)

Ecology currently regulates more than 11,000 active tanks on approximately 4,000 different properties, including gas stations, industries, commercial properties, and governmental entities. The agency works to ensure these tanks are installed, managed, and monitored in a manner that prevents releases into the environment. To do so, the agency conducts compliance inspections on about 800 sites per year (most sites have multiple tanks) and provides technical assistance to tank owners.

Inspection Overview (.pdf 1,128 kb) Updated May 12, 2004

This Adobe Acrobat pdf file provides an overview in words and pictures of what Ecology inspectors look for during UST inspections. Also serves as a user-friendly overview of UST requirements. This overview was created in powerpoint, and then converted to pdf format for easy accessibility.

Detailed UST Site Inspection Guidance Document Added
October 2004 (.pdf)

This guidance document is intended to provide information needed by underground storage tank (UST) owners, tank service providers, and government agencies involved in preventing releases from USTs. This document explains each item on the attached UST Site Inspection checklist, which is used by inspectors, while conducting UST site inspections.

Focus on Flooding - December 2007

Korean: 정부 간행물을 애크로밧 (Acrobat) PDF 형식으로 보기

Electronic Data

UST and LUST Lists -- new format!
Try out the new Web Reporting Portal.
New LUST List Instructions
New Regulated USTs List Instructions

Facility Site on the Web
The Facility/Site Identification System contains key information for each facility/site that is currently, or has been, of interest to Ecology, including underground storage tanks (UST) and leaking underground storage tanks (LUST) . The system allows users to dynamically query the database based on specific criteria (e.g. county, city, facility site, site id, Standard Industrial Classification codes, etc.).

Facilities with Compliance Tags -- Updated March 10, 2008

Data Submittal Requirements

Information about...

What To Do If You Find A Leak Or Spill From Your Underground Storage Tank
Automatic Tank Gauges Added March 29, 2005
Also available in Hindi:

Biodiesel in Underground Storage Tanks Added October 29, 2003
Check Your Farm Tank... It May be Regulated -- Updated November 8004
Closure Requirements for Temporarily Closed Underground Storage Tank Systems
Heating Oil Tanks
Also see the Pollution Liability Insurance Agency for information on the insurance program for residential heating oil tanks.
Methyl Tertiary-Butyl Ether (MTBE) -- Added Oct 10, 2000
Technical Assistance Program
Waste Oil Tanks -- Updated September 2003

Service Providers

Draft UST Service Providers -- April 8, 2008
- Are you interested in becoming certified for tank installation & retrofitting, tank decommissioning, tightness testing, cathodic protection installation & testing, or site assessment associated with tank closures