What should you do with an old underground storage tank (UST) that isn’t being used anymore? Don’t just ignore it; there could be serious consequences if the tank contains hazardous materials and becomes compromised. There can be regulatory hurdles with this, as well. Here are a few tips on what you can do when closing a UST or changing service for a UST.

You can temporarily close your UST for up to 12 months by following these requirements:

• Continue to monitor for leaks by maintaining the UST’s leak detection.

If your UST is empty, you do not need to maintain testing or inspections for release detection.

• Continue to monitor and maintain corrosion protection systems.
• If the UST remains temporarily closed for more than 3 months, leave vent lines open, but cap and secure all other lines, pumps, manways, and ancillary equipment.

If you are permanently closing your UST, you will need to:

• Notify regulatory authorities 30 days before closure.
• Determine if leaks from the tank have damaged the environment, using the results of monthly vapor or groundwater monitoring or a site assessment. If there is damage, the owner or operator will be required to take corrective action.
• Empty and clean the tank. If the tank is left in the ground, it must be filled with an inert solid material (e.g., sand) or closed in place in a manner approved by the regulating agency.

A UST that is just left to sit can create an environmental and regulatory headache for you, as the owner, or any future owner of the property. A properly closed UST will give you peace of mind knowing it won’t become a danger.