UST Work: Permit Required

The following UST activities in Montana require a permit from DEQ:

  • Removing, closing in place, or changing in service of underground storage tanks or piping (product or vent)
  • Working on an UST system that requires excavation or cutting the concrete. This includes work on tanks, piping(product or vent), corrosion protection, automatic tank gauge (ATG), interstitial sensors, monitoring wells, lining, proving structural integrity, risers, pipes, spill and overfill.
  • Installing an overfill device that does not require excavation or cutting concrete(i.e. drop tube shut off, overfill alarm when conduit is stubbed in, and vent ball overfill device (ball vent float valves, etc.) when extractor assembly is stubbed in). NOTE: replacing an existing overfill device with the same type of device requires a permit only if cutting concrete or excavation is required.
  • Replacing or repairing a damaged spill bucket.
  • Installing a drop tube. Note: replacing a drop tube requires a permit only if cutting the concrete or excavation is required.
  • Reconstructing, abandoning, or closing monitoring wells.
  • Installing an ATG (in tank leak detection device) or interstitial sensors, whether or not the conduit and riser were previously installed.
  • Installing heat-shrink sleeves or water-tight boots to riser or flex connectors for corrosion protection.
  • Installing off-set sleeves to risers for corrosion protection. (Offset sleeves do not provide corrosion protection for flex conntectors.)
  • Installing anodes on riser or flex connectors for corrosion protection.
  • Installing additional anodes or an impressed-current system on an existing UST system.
  • Providing an internal inspection of a tank.
  • Replacing a UST system component with a different model component.
  • Extending an existing vent standpipe.

The following UST activities do not require a permit:

  • Replacing a defective mechanical line leak detector with the same type device(i.e. replace screw-in mechanical line leak detector with another screw-in mechanical line leak detector.)
  • Testing tank or line tightness testing.
  • Testing line leak detector functionality.
  • Testing piping to determine if it is standard or European style suction.
  • Replacing an existing drop tube. (Requires a permit to install a new drop tube or if excavation is required).
  • Testing sump or interstial sensor functionality.
  • Testing of ATG functionality by factory trained technician.
  • Replacing a drop tube overfill device, a vent ball (ball vent float,etc.) valve overfill device via an existing overfill alarm This does not include installing a vent ball extractor assembly. (Requires a permit to change the type of overfill device or if excavation is required.)
  • Testing of a CP system by a qualified CP tester.
  • Adjusting of a CP system rectifier by a CP tester.
  • Replacing a sensor with the same model of sensor.