Underground storage tank closures

If you are temporarily or permanently closing your underground storage tanks, the items below may be required. Be sure to also check with your local city and county authorities to determine if there are additional requirements associated with your tanks.

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Return to the main UST webpage
Read the underground storage tank law

Temporary closure

Required forms: Temporary Closure Notice

Returning tanks to operation, after temporary closure

Required Forms: Operational Status Notice

Permanent closure

Required forms:

30-Day Notice
Permanent Closure Notice¹
Site Check/Site Assessment Checklist

¹The author of this report must be ICC-Certified or a registered professional engineer.

Required documents: Site Assessment/Report

Guidance

Requirements for Temporarily Closing Tanks
Permanent closure instructions
Site Assessment guidance for underground storage tank systems

All forms, checklists, and reports must be submitted to:
Department of Ecology
Underground Storage Tanks
P.O. Box 47655
Olympia, WA 98504-7655

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