MassDEP Underground Storage Tank (UST) Regulations (310 CMR 80.00) address the registration, installation, operation, maintenance, closure and inspection of UST systems used to store petroleum fuels and hazardous substances. The UST program is a major component of the state's groundwater resource protection efforts.


You are required to register all new USTs, any changes in ownership, and significant modifications to existing systems with MassDEP. Please make sure that the information MassDEP has on file for your UST(s) is up to date by checking the Underground Storage Tank (UST) Facility Search . You may update information for the UST(s) that you own and/or operate via the UST Online Filing System. See UST Online Filing, Forms & Help for additional information.

On-Site Inspections

You must have your UST(s) inspected once every three years by a registered Third-Party Inspector (TPI). Information about inspections and a list of TPIs who are registered to perform inspections in Massachusetts. See:  Third-Party UST Inspection Program

Online Resources

MassDEP UST Program information, forms and compliance assistance are available online. See: Underground Storage Tank (UST) Program

MassDEP UST Forms

See UST Online Filing, Forms & Help to register underground storage tanks with MassDEP, update information about your facility or UST system(s), notify the agency of changes in their status, and report the results of third-party inspections.


If you would like to speak with a member of the MassDEP UST Program staff, please call: 617-556-1035, extension 2. You may also email questions to:

Release Reporting

To report a release from a leaking underground storage tank system, please immediately call your local fire department AND the MassDEP 24-hour Emergency Response Line at 1-888-304-1133.