As others have mentioned, if it’s actually a propane tank, you have very little to worry about from a remediation standpoint. Propane tanks are still being buried today. I have one in my backyard that was installed two years ago when my house was built.
If propane tanks leak, the gas simply vents to the atmosphere. No possibility of soil or groundwater contamination. However, in your case, with an abandoned tank, I would still contact the appropriate regulatory agency in your area or a licensed professional to ensure that no hazard exists from the tank.
If the tank is a liquid fuel tank (such as heating oil), it’s much more of an issue. All underground metal storage tanks eventually leak. You then have what’s referred to as a LUST (Leaking Underground Storage Tank). This is the reason that far fewer liquid fuel tanks are being buried today, and those that are buried are required to have double walls and leak detection systems.
Leaking tanks can be quite expensive to remediate, as it’s anyone’s guess as to how long a leaking tank has been leaking waste fuel into the soil and groundwater. Depending on your state and local laws, you and/or the responsible party may be required to remediate the condition. If anything, remediation requirements are generally more stringent for residential vs. industrial/commercial sites, because of the increased time that people are present in residential areas, and the increased likelihood that children and pregnant women could be exposed to any hazard.
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When I was involved in an environmental cleanup in the mid 80’s in Maryland, sellers were allowed to keep environmental problems a secret, and it became the buyer’s legal responsibility to clean it up. I think this varies from state to state, and wouldn’t be surprised if there were many changes to the law in the last couple decades.
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There have been changes. I know of no state where sellers can escape responsibility for environmental issues of the sort being discussed*, disclosed or not. If you can prove that a previous owner was responsible for an environmental issue (e.g. improperly disposing of waste motor oil in the backyard), then the seller can never escape responsibility. On the other hand, if a seller is deceased or cannot be located, the current owner may indeed end up footing the bill. In such a situation (where the current owner is not responsible for the problem), there are various funding programs that can help offset this, such as the LUST trust fund.
Any current owner of a property with environmental issues would be well-advised to contact an environmental professional who can advise them on how best to proceed. The environmental professional can help determine the extent of the problem and who the potentially responsible parties (PRP), such as previous owners, may be. An attorney experienced in environmental law would also be a good resource.
In Connecticut, there is a program to license environmental professionals with the LEP (Licensed Environmental Professional) license. In Massachusetts, they have the LSP (Licensed Site Professional) license. Many states also have licensed professional engineers who specialize in environmental engineering. New York recognizes the term “environmental professional,” but does not yet have a license established for the profession.
*Note that this does not generally apply to environmental issues due to products that were legal at the time of installation, but are currently banned, such as asbestos and lead paint.
Disclaimer: None of the above should be considered to be professional advice.