skip navigation
New Hampshire Department of Environmental Services


The purpose of the Underground Storage Tank (UST) Program is to prevent and minimize contamination of the land and waters of the state due to the storage and handling of:

  • heating oils,
  • hazardous substances,
  • lubricating oils,
  • motor fuels,
  • other petroleum and petroleum contaminated liquids.

The Department of Environmental Services (NHDES) established rules for registration; permitting; and standards for design, installation, operation, maintenance, and monitoring of UST facilities. These rules apply to:

  • all underground storage tank systems that store motor fuels or a regulated substance other then heating oil having a total storage capacity of more than 110 gallons, and
  • non-residential tank systems having an on-premise use heating oil storage capacity of more than 1,100 gallons.

The owner of an underground storage facility must register the facility with NHDES by providing the information required in UST facility rules. Owners are required to submit in writing any change in facility status, such as, ownership and equipment within 10 days of the change. No person is allowed to operate a facility, which is not registered with the department.

The owner of a UST facility must provide an application and plans to NHDES before:

  • commencing construction,
  • installation of a new or replacement system, or
  • a substantial modification of an existing underground storage system.

The plans must be prepared and stamped by a registered professional engineer, licensed to practice in the state of New Hampshire.

Notification to NHDES of the completion of the installation is made at least 5 days prior to backfilling the tank top and/or piping, to arrange for an inspection and a letter prepared and stamped by the engineer shall be submitted to NHDES statingthat the construction has been performed in accordance with the approved plans.

The new system shall not be backfilled or placed into service until NHDES determines that the system meets the rules for a new UST system.

NHDES must be notified within 30 days prior to any scheduled system closure. An assessment must be completed and results sent to NHDES to determine if any contamination is present.

NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

copyright 2017. State of New Hampshire