Most people find out about the tank the same way. The deal is moving, the buyer’s attorney sends over a list, and somewhere on that list is a question about an underground storage tank on the property.
Then you are standing in the side yard looking at a capped pipe sticking out of the lawn that you have walked past for fifteen years without thinking about once.
If you grew up in Nassau or Suffolk, you already know why this is so common here. Long Island heated with oil for decades. When natural gas lines went in through the 1960s, 70s and 80s, thousands of homeowners converted, and a lot of those conversions stopped at the furnace. The tank stayed in the ground.
Nobody was hiding anything. The contractor swapped the heating system, the oil company stopped delivering, and the tank quietly became somebody else’s problem forty years later. That somebody is usually the person trying to sell the house.
What New York actually requires
Start with the part that is written down, because there is a lot of bad information floating around about this.
The New York State Department of Environmental Conservation publishes a homeowner guide to underground heating oil tanks, and it is worth reading before you talk to a single contractor.
DEC is direct about the tank itself. State law requires that aboveground and underground heating oil tanks be emptied, cleaned and purged of all vapors. That applies whether or not you ever plan to use the tank again.
After that you have two legitimate paths.
Remove it. The tank comes out of the ground, and the vent and fill lines come out with it, or the fill line gets capped with concrete. DEC calls removal the best choice, for two reasons that matter to a seller. You can see the soil underneath, and you will never get a sinkhole where the tank used to be.
Close it in place. The tank stays where it is and gets filled with an inert material such as sand. Vent lines are left open and intact, and the fill line is capped or removed.
Both are legal. They are not equal when you go to sell, and we will get to why.
The Suffolk County rule that surprises people
Here is where homeowners get told things that are not true.
Somebody says the county is going to make you dig it up. Somebody else says you cannot close on a house with a buried tank in it. Neither is accurate as a blanket statement.
Suffolk County regulates storage tanks under Article 12 of its Sanitary Code, and the Department of Health Services summarizes the rules on its page for toxic and hazardous materials storage facilities.
A few things from that page are worth knowing in plain language.
Residential heating oil tanks under 1,100 gallons are exempt from the permit to construct, and sites holding only heating oil under a total of 1,100 gallons are generally exempt from registration, outside of Article 7 regulated areas. Almost every home tank on Long Island is well under that threshold.
Tanks smaller than 1,100 gallons do not require the periodic testing that larger tanks do.
And the sentence that catches most people off guard: fuel oil tanks do not have to be removed unless they are leaking.
That is the county’s position, not ours. If your tank is intact and nothing has leaked, Suffolk is not standing in your driveway demanding an excavator.
If you want the actual answer for your specific property, the Bureau of Environmental Engineering takes calls at 631-854-2528. Nassau County homeowners should check with the Nassau County Department of Health, since DEC itself points residents of Nassau, Suffolk and Westchester to their county health agency for local rules.
So why does the tank still kill deals
Because the county is not the one buying your house.
A retail buyer with a mortgage has a lender, an attorney, an inspector and an insurance carrier, and any one of them can decide the tank is a problem even when the county does not. We have watched all four do it.
The lender wants the tank removed before closing. The buyer’s attorney wants a tank test and a clean soil report. The inspector flags the fill pipe and the buyer gets nervous. The insurance carrier asks whether there is an underground storage tank on the property and the answer changes the quote.
Then there is the escrow conversation. The buyer agrees to proceed if you leave twenty or thirty thousand dollars in escrow at closing, and now you are funding a cleanup you may never need, with your own money, while you are trying to move.
None of that is a legal requirement. All of it is real, and all of it costs you time.
Where the actual money is
Removing an intact tank is not the expensive part. DEC estimates tank removal at roughly $1,000 to $5,000.
The expensive part is what the excavator finds underneath.
If the tank leaked, you are into soil remediation, and DEC does not soften that language. Cleanup can cost tens of thousands of dollars, and if your homeowners policy carries a pollution exclusion, as many do, you could get stuck with the bill.
Contamination also has to be reported. DEC directs homeowners to the state Spills Hotline at 1-800-457-7362.
So the real decision is not whether a tank removal fits your budget. It is whether you can afford to find out what is under it, in the middle of a sale, on the buyer’s timeline.
And there is a practical trap in the sequence. Once you pull the tank and discover a problem, you now know about it. New York’s property condition disclosure rules are not kind to sellers who have answers they would rather not give, and no attorney is going to let you pretend the report does not exist.
What you are required to tell a buyer
Short version: more than you used to be.
New York amended its Property Condition Disclosure Statement effective March 20, 2024, and the old workaround where a seller handed the buyer a $500 credit at closing instead of filling out the form is gone. If you are selling a Long Island house in 2026, expect to answer the questions.
A buried tank, a past leak, a remediation report, a closed-in-place tank you inherited from the prior owner, all of it belongs in an honest conversation with your attorney before the house goes on the market, not after a buyer’s engineer finds the fill pipe.
How a cash sale changes the math
We buy houses on Long Island as they sit, and an oil tank is one of the conditions we are buying.
That means a few specific things for you.
We do not ask you to remove the tank before closing. We are not sending the deal to an underwriter who will. We do not ask you to fund an escrow and wait to find out whether you get it back. And we are not going to renegotiate three days before closing because a report came back with a number on it.
We price the tank into the offer up front and we tell you we did. You will know what it cost you, you will know it before you say yes, and the number does not move afterward.
For a lot of sellers that is the entire appeal. Not that a cash offer is the highest number on paper, but that it is the number that actually shows up at closing.
If the tank is one of several things going on with the property, that is normal around here too. We also buy Long Island homes that need major repairs, and we have written about selling a house with open code violations in Nassau or Suffolk County, which tends to show up on the same properties for the same reason: work that was done a long time ago and never closed out on paper.
If the house is sitting empty while you sort this out, selling a vacant Long Island home has its own set of problems worth understanding before another winter goes by.
A sensible order of operations
If you are not in a hurry, do it in this order.
Find out what you actually have. A tank sweep costs a few hundred dollars and tells you whether there is a tank, where it is, and roughly how big.
Call the county before you call a contractor. Suffolk at 631-854-2528, or Nassau’s health department, will tell you what is required at your address rather than what a salesperson tells you is required.
Talk to your attorney about disclosure before you dig, not after.
Then decide whether you want to spend the money and the months, or whether you would rather sell the house with the tank in it and be done.
If you would rather just be done
If you have a buried oil tank and no interest in finding out what is underneath it, we will make you a cash offer on the house exactly as it stands, tank included.
No removal, no soil report, no escrow holdback, no repairs, and no commissions. You pick the closing date.
Call We Buy Homes In Long Island at (631) 201-1727 or request your offer here. It costs you nothing to find out what the number is.
This post is general information, not legal or environmental advice. Tank rules differ between Nassau County, Suffolk County and individual towns, and they change. Confirm your own requirements with the New York State DEC, your county health department and your attorney.