Underground storage tank
An Underground Storage Tank License is required for owners of storage tanks with all of the following:
- Capacity greater than 110 gallons.
- At least 10% of volume (including piping) below the surface of the ground.
- Contain petroleum or other hazardous substances.
Note: Some tanks may be exempt.
How to get a license
- The owner must file an application within 30 days after a new installation is complete, or upon modification or purchase of existing tanks.
- A Notice of intent to install must also be filed directly with the Department of Ecology at least 30 days before new installation work begins.
- All owners of regulated UST's, other than state or federal government agencies, must provide proof of ability to pay costs of a release from their tanks at the liability minimums set in WAC 173-360-400 through 406.
Note: If using insurance, attach a Certificate of Insurance from your provider, as set forth in WAC 173-360-480, listing as the certificate holder:
Business Licensing Service
PO Box 9034
Olympia WA 98507-9034
If you are not using liability insurance, attach a Certificate of Financial Responsibility as set forth in WAC 173-360-496.
Post your license
A license must be posted at each location where the licensee operates. You may not begin this business activity until you receive a Business License listing the required license.
Forms you’ll need
Fees
| Specialty license |
Fee |
| Underground Storage Tank License |
$160 per tank |
| Weighing and measuring device |
Variable |
| Other fees that may apply |
Fee |
| State tax registration |
No fee |
| Registering your business name as a trade name |
$5 |
| Business License Application fee |
$15 (non-refundable) |
Contact information
State of Washington
Business Licensing Service
PO Box 9034
Olympia, WA 98507-9034
Phone: 1-800-451-7985
Email: BLS@dor.wa.gov
Fax: 360-705-6699
Office hours
Monday through Friday
8 a.m. to 5 p.m.
Mailing information
Please remember to enclose all necessary documents and fees with your completed application. Incomplete submissions will result in a delay in your licensure.
It is important that you contact our office, in writing, with any changes in address.
Regulatory questions
Department of Ecology
Phone: 360-407-7037 or 1-800-917-0043
http://www.ecy.wa.gov
