WA State Licensing: Underground storage tank

Underground storage tank

An Underground Storage Tank endorsement 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.

Requirements

  • 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.

See also:

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 endorsement(s).

How to apply

Apply by using one of the following options:

  • Online with My DOR. My DOR works best with Mozilla Firefox or Google Chrome.

    1. Login using your Secure Access Washington (SAW) user ID. If you don’t have a user ID or aren’t sure, see if you have an account first before signing up.
    2. Once logged in, add My DOR to your list of services, then open My DOR.
    3. Follow the steps below based on your business status.

      If you do not have an existing business

      1. Click File Business License Application. Be sure to select the endorsements for which you wish to apply.

      If you have an existing business

      1. If you haven’t already, add access to your business. You’ll need a UBI number and letter ID.
      2. Click on the business you want to apply for a license/endorsement under, then click on the location.
      3. Click Add License Endorsements/Employees.
  • You can pay using an E–check or a major credit card (gift cards can’t be used).


    Find more help for using My DOR, including video tutorials.


    By mail

    1. Complete the following:
    2. Mail your completed forms with a check or money order payable to “Department of Revenue” for the fees to:

      State of Washington
      Business Licensing Service
      PO Box 9034
      Olympia, WA 98507-9034

    Fees

    Specialty endorsement Fee
    Underground Storage Tank $160 per tank
    Weighing and measuring device Variable
    Other fees that may apply Fee
    Registering your business name as a trade name $5
    Business License Application $19 (non-refundable)

     

    Regulatory questions

    Department of Ecology
    Phone: 360-407-7037 or 1-800-917-0043
    http://www.ecy.wa.gov