If you own property with an underground storage tank, you face a hard reality: if that tank leaks, you are almost certainly liable for the cleanup, regardless of whether you caused the leak. This is strict liability, and it applies to underground storage tanks that hold petroleum or other hazardous substances. The Environmental Protection Agency and most state environmental agencies enforce rules that make tank owners and operators financially responsible for any contamination that reaches the soil or groundwater, even if the leak happened before you bought the property or was caused by a third party you had no control over.
The legal theory behind strict liability is simple. Storage tanks are inherently dangerous because they corrode, crack, or fail over time. The person who chooses to install and maintain a tank assumes the risk. If that risk becomes a reality, they pay the price, no fault analysis required. This is not negligence law, where you can argue you took reasonable precautions. With strict liability, the only relevant question is whether a leak occurred and whether you are the owner or operator. Courts have consistently held that property owners cannot escape liability by claiming they did not know the tank was leaking or that the tank was already old when they took ownership.
The practical impact is severe. A small gasoline leak from a residential heating oil tank can cost thirty to fifty thousand dollars to clean up. A larger release from a commercial service station can run into millions, especially if the contamination reaches groundwater. Insurance policies often have pollution exclusions that kick in precisely when you need coverage. This leaves property owners paying out of pocket, selling assets, or even declaring bankruptcy. The Environmental Protection Agency can also issue administrative orders requiring immediate action, and if you fail to comply, daily fines pile up.
One of the most common scenarios involves property transfers. A buyer purchases a former gas station site, unaware that the underground tanks have been leaking for years. The soil and groundwater are contaminated with benzene, toluene, and other chemicals. The state environmental agency discovers the contamination during a routine inspection and names the new owner as a responsible party. The buyer did not cause the leak, did not know about it, and bought the property in good faith. None of that matters. Strict liability runs with the land, meaning the current owner inherits the cleanup obligation.
Another situation involves leaks from abandoned tanks that were left in the ground decades ago. The original owner is long gone, the business dissolved, and the property has been sold multiple times. The current owner may not even know the tank exists until a contractor digging a foundation hits metal. Once the tank is exposed, testing shows release. The current owner is now on the hook. The only defense is to prove that someone else is actively responsible and financially able to pay, but that rarely happens. Most states have funds that help owners pay for cleanup, but accessing those funds requires jumping through procedural hoops and often covering a deductible yourself.
Strict liability also applies to operators, not just owners. If you lease a property with an underground storage tank and you are responsible for filling and maintaining it, you can be held liable as an operator. This means tenants, franchisees, and even contractors who handle tank inspections can be pulled into lawsuits. The key is whether you had control over the tank system at the time of the leak. Even a small convenience store clerk who regularly checked tank levels could be considered an operator if the leak happened during that period.
The legal landscape varies by state, but the common thread is that strict liability eliminates most traditional defenses. You cannot argue that you were not negligent, that you followed industry standards, or that the leak was an unavoidable accident. The only real defenses are proving that the leak never happened, that you are not the owner or operator, or that the contamination came from some other source. Even then, the burden is on you to prove it. Environmental agencies and courts presume that the tank owner is responsible for any contamination found in the soil or groundwater directly beneath the tank.
For anyone dealing with underground storage tanks, the takeaway is clear. Do not buy property with a tank unless you are prepared to pay for a future cleanup. If you own a tank, test it regularly, keep meticulous records, and consider removing it as soon as practical. The longer a tank stays in the ground, the higher the risk of a leak that triggers strict liability. And once that liability attaches, it is almost impossible to shake. The law does not care about fairness or good intentions. It cares about who has the deepest pockets and the closest connection to the tank.
