Land records · Parcel maps · October 6, 2026
How to Find Underground Storage Tank Records
How to find underground storage tank records: search state UST and leak databases, ask the fire marshal, check Sanborn maps, and review permit files.
How to find underground storage tank records depends on the type of tank. Commercial tanks for petroleum or hazardous substances, such as at gas stations, are regulated under federal and state rules, and states keep searchable databases of registered tanks and leaking tank cases. Residential heating oil tanks used on-site are excluded from federal UST rules, so records may be limited to local fire department permits, removal certificates, or nothing at all. Old maps, aerial photos, and permit files can help fill gaps. This page is general land-records background, not legal advice.
Commercial vs residential tanks
| Tank type | Typical records |
|---|---|
| Gas station and commercial fuel tanks | State UST registration and inspection records |
| Leaking tank sites | State leaking UST case files and cleanup status |
| Residential heating oil tanks | Local permits or removal records, if any |
| Farm fuel tanks | Varies; small farm tanks may be exempt |
State databases
Most state environmental agencies publish UST and leaking UST databases. Search by address, facility name, or map. Records may include tank size, contents, installation and removal dates, leak reports, and closure letters. A “no further action” letter means the agency closed a cleanup case under its standards.
Local records
- Fire marshal or fire department: many issue permits for tank installation or removal.
- Building department: permits for tank removal or oil-to-gas conversion. See how to find building permits for a property.
- Health department: sometimes tracks tanks near wells.
Clues when records are missing
- Fill pipes or vent pipes sticking out of the ground near the house.
- Copper fuel lines entering the basement from outside.
- An old oil furnace or boiler, or a converted heating system.
- Sanborn maps showing gas stations or garages. See sanborn maps.
- Historic aerial photos showing pump islands. See how to find historic aerial photos.
Tank sweeps
Environmental firms perform tank sweeps with metal detectors or ground-penetrating radar to locate buried tanks. Buyers in older neighborhoods with oil heat sometimes order a sweep during due diligence.
Phase I environmental assessments
For commercial property, a Phase I environmental site assessment reviews government databases, historical records, and site observations for tanks and other concerns. It is common before buying commercial land.
If a tank is found
Leaking tanks can contaminate soil and groundwater. Removal or abandonment in place should follow state and local rules, often with soil testing. Keep all documents for future buyers. Some states have funds that help with cleanup costs.
Wells nearby
Tanks near private wells raise concerns for drinking water. See how to find well records for a property.
Bottom line
To find underground storage tank records, search your state’s UST and leaking tank databases, ask the fire marshal and building department, and check Sanborn maps and aerial photos. Residential heating oil tanks may have few records, so look for physical clues or order a tank sweep. Find county and local offices via the Platbookmapper map.
How to find underground storage tank records FAQ
How do I know if my property has an underground oil tank?
Look for fill or vent pipes, check permit records, or order a tank sweep.
Are residential heating oil tanks regulated?
They are excluded from federal UST rules, but state or local rules may apply.
Where are leaking tank records kept?
In state environmental agency leaking UST databases.
What is a no further action letter?
A state letter closing a cleanup case under its standards.
Do sellers have to disclose underground tanks?
Many state disclosure forms ask about tanks; requirements vary.