law
underground storage tank
A tank, along with its connected piping, that has a significant portion of its volume below ground, commonly used to store petroleum or hazardous substances. Leaking tanks can contaminate soil and groundwater and create costly cleanup obligations. Federal rules regulate commercial tanks, while residential heating oil tanks are often regulated by state law, so requirements vary by state.
- Exam tip
- Expect questions about environmental disclosure and inspections. A buried home heating oil tank is a material fact a licensee should not ignore.
- Example
- During inspection, a buyer discovers a vent pipe and fill cap in the yard indicating an old buried oil tank, and requests a tank sweep before closing.
Related terms & state variants
Sources
Source verification pending. Confirm current requirements with your state regulator.
Last verified: 2026-10-23