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.
Temporary closure
Required forms: Temporary Closure Notice
Returning tanks to operation, after temporary closure
Required Forms: Operational Status Notice
Permanent closure
Required forms:
1 The author of this report must be ICC-certified, a registered professional engineer, or a licensed hydrogeologist.
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