Buying or Selling a Westchester Home With an Oil Tank
Updated 2026-10-12
An old heating oil tank is one of the most common surprises in a Westchester home sale. Buyers worry about a leak they can't see, lenders and insurers ask questions, and sellers find out late that the paperwork from a removal decades ago is missing. Here is what both sides should check before closing.
The short answer
If there is, or might be, a buried tank, find out for sure before contract, and get it removed or properly closed with permits and soil test results on paper. Clean documentation is what makes a tank a non-issue at closing.
For buyers: what to ask for
- Is there a tank, now or ever? Look for a fill pipe or vent pipe sticking out of the ground or the side of the house, or copper supply lines coming through the basement floor or wall. Homes that switched to gas often left the old tank behind.
- If it was removed or closed: ask for the building permit, the inspection sign-off, the soil test results and the disposal receipt. Pleasantville, for example, requires soil samples whether the tank is clean or not, so there should be lab results on file (Village of Pleasantville).
- If no one knows: an oil tank sweep uses a metal detector to look for a buried tank and its pipes. It is inexpensive next to the cost of finding a tank after you own the house.
- If there is a tank still in use: remember that a tank test only shows the tank is tight today. DEC notes a test can't predict a future leak (DEC homeowner guide).
Why the insurance question matters
DEC warns that most homeowner's insurance policies have a pollution exclusion and may not pay to clean up a heating oil leak, and that cleanups can run to tens of thousands of dollars. Once you own the property, a leak is generally your problem. Ask your insurance agent, before closing, exactly what is and isn't covered.
For sellers: deal with it before you list
A tank found during the buyer's inspection puts you on their timeline. Dealing with it before you list keeps you in control of the cost and the schedule.
- Find your old paperwork. If the tank was removed years ago, your town or village building department may have the permit on file.
- If the tank is still there, get quotes for removal or closure in place. DEC puts removal at about $1,000 to $5,000 for a residential tank when the soil is clean.
- Get the permit and inspection. Each municipality has its own process. Croton-on-Hudson, for example, asks for the contractor's Westchester County license, insurance, equipment specs and a drawing, with a final inspection by the plumbing inspector (Village of Croton-on-Hudson).
- Keep the soil test results. This is the document buyers' attorneys ask for most.
Removal or closure in place: which looks better to a buyer?
DEC calls removal the best choice. A removed tank, with clean soil results, leaves nothing for a buyer to worry about. Closure in place is legal in many towns, but Pleasantville only allows it when the tank has no holes and there is no contamination, and some buyers still prefer the tank gone. If the tank sits under a driveway or an addition, closure in place may be the practical option; just make sure the permit and soil results are complete.
If the soil test shows a leak
Contaminated soil has to be cleaned up to the satisfaction of the Westchester County Department of Health and DEC (Village of Pleasantville), and a spill must be reported to the DEC Spills Hotline at 1-800-457-7362. The State Comptroller's Oil Spill Fund notes spills must be reported within two hours of discovery (Office of the State Comptroller). A cleanup will change the timeline of a sale, which is the best reason to find out early.
Larger tanks
Most homes have a 275 or 550 gallon tank. Tanks of 1,100 gallons or more must be registered with the Westchester County Department of Health, and the county asks for 48 hours' notice before a closure inspection (Westchester County DOH). This mostly affects larger homes, multi-family buildings and small commercial properties.
Need a sweep, removal or soil test?
We connect buyers, sellers and homeowners across Westchester County with an independent, licensed oil tank contractor. Call or request a quote and tell us your town and your closing date.
Sources: NYS DEC homeowner guide to heating oil tanks, Westchester County DOH Petroleum Bulk Storage, Village of Pleasantville, Village of Croton-on-Hudson, NYS Comptroller Oil Spill Fund. This is general information, not legal advice; your attorney and building department have the final word.