A seller in Commack sits down with the closing paperwork and mentions, almost in passing, that her neighbor handled the disclosure form back in 2019 by simply writing a check. Five hundred dollars, credited to the buyer at closing, and the seller never had to answer a single question about the house. No boxes checked, no explanations required. That was the deal for years under New York's Property Condition Disclosure Act: complete the 56-question form honestly, or pay the buyer $500 and walk away from the whole exercise.
That shortcut is gone. New York amended the Property Condition Disclosure Act effective March 20, 2024, and sellers of residential property now have to actually complete and deliver the disclosure statement before a buyer signs a contract. The old workaround, paying the credit instead of answering, no longer satisfies the law the way it used to. For most Long Island sellers this is a paperwork inconvenience. For a seller in Commack, it lands on one question in particular, and it lands harder than in most nearby towns.
Why The Tank Question Is Different Here
Well into the disclosure form is a question that asks, in the state's own language, whether there are or have ever been fuel storage tanks above or below the ground on the property. It asks whether any such tank is currently in use, and whether it is leaking or has ever leaked. In a town where most houses were built after 2000 with gas heat from day one, this question gets a quick "No" and everyone moves on.
Commack is not that town. The housing stock here was built out almost entirely between 1958 and 1985, a run of split-levels, hi-ranches, and colonials that a local spray foam contractor has documented directly from three decades of jobs: splits concentrated on the east side near the Long Island Expressway, hi-ranches through the middle of town, larger colonials toward the north near Elwood and Northport. HVAC contractors working the same streets describe the same vintage, homes originally built with oil boilers and baseboard radiators and no ductwork at all. A lot of those systems were converted to gas somewhere along the way, sometimes decades ago, sometimes by an owner two or three sales back. The furnace changed. What often didn't change is what's still sitting in the ground.
That is exactly the scenario the amended law now forces onto paper. Saying "I don't know" was tolerable when the $500 credit made the tank question optional in practice. Now the seller has to check a box, and an honest "unknown" on a form the buyer's attorney reads closely is a different conversation than a check nobody looked at twice.
The Suffolk Rule Nassau Sellers Don't Expect
Here's the part that catches people moving within Long Island off guard. New York's Department of Environmental Conservation treats most residential heating oil tanks as too small to fall under the state's own Petroleum Bulk Storage program, since they're generally under the 1,100-gallon threshold that triggers state oversight. But the DEC's own homeowner guide is explicit that Nassau, Suffolk, and Westchester are "delegated counties," meaning each one writes its own rules on top of the state baseline. Suffolk and Nassau did not write the same rule.
| Nassau County | Suffolk County | |
|---|---|---|
| Abandonment in place allowed | Any tank size used for on-site heating | Only tanks under 1,100 gallons |
| Larger tanks | Tightness test or one year of monitoring required | Must be removed from the ground |
| Governing authority | County health regulations | Sanitary Code, Article 12, enforced by the Department of Health Services |
A seller who bought their first home in Nassau, left the old tank abandoned in place with a signed attestation, and assumes the same move will work on their Commack split-level is assuming wrong. Suffolk's own code, adopted by county resolution and administered by the Department of Health Services, draws the line at 1,100 gallons regardless of what a Nassau contractor told them was fine ten years ago. Suffolk did, at one point, offer a $100 rebate to homeowners who properly closed a tank under that threshold, which tells you the county has been thinking about this inventory of aging tanks for a while.
What A Late Discovery Costs In This Market
None of this matters much in a market where buyers wait patiently for paperwork to sort itself out. That is not the market Commack is in right now. As of August 2026, homes listed in Commack were selling with a median time on market of roughly 26 days, a market moving noticeably faster than it was a year earlier. Separate data on the same town describes a competitive market where homes routinely field multiple offers and close in around a month, the kind of pace that puts sellers in a strong position, provided nothing derails the timeline.
A tank question that surfaces after an accepted offer does exactly that. A buyer's attorney who spots an "unknown" answer on the fuel storage tank question, or worse, a disclosure statement that wasn't delivered at all before contract signing, can pause a deal to request a tank sweep, soil documentation, or a price adjustment. In a slower market that costs a seller a few extra weeks. In a market where the next buyer in line is watching three other Commack listings, it costs leverage the seller had and won't get back.
A Sensible Order Of Operations
The fix here is not complicated, but the sequence matters more than the individual steps.
- Pull whatever paperwork exists. A prior removal invoice, a closure permit from the building department, or a soil report from a past sale settles the question outright and turns the tank disclosure into a two-minute answer.
- If no paperwork exists and the house predates the mid-1980s, treat that as a real unknown rather than an assumption of "probably fine." A licensed environmental firm can run a tank sweep before the house ever hits the market. Eastern Environmental Solutions, which works across Nassau and Suffolk including Huntington, describes typical inspection costs in the $300 to $700 range, a modest expense set against the cost of a deal stalling mid-contract.
- If a tank turns up and it's under 1,100 gallons, closure in place through a licensed contractor, documented and filed with the county, is a legitimate path in Suffolk. If it's larger, plan for removal, not closure, since that's what the county code actually requires here.
- Complete the disclosure statement itself rather than defaulting to the old credit. The amended law changed what that credit actually accomplishes, and an incomplete or skipped form now carries more legal exposure than it used to.
- Keep every document generated along the way. The same records that answer the fuel storage tank question today are the ones a future seller, possibly the buyer standing across the table from you now, will need the next time this house changes hands.
A Few Questions Worth Asking Directly
What if the house has always had gas heat as far as I know? Say so on the form. The obligation is to disclose actual knowledge, not to investigate a system that was never oil-fired. The question only becomes a real decision point when there's a former oil system, a converted furnace, or genuine uncertainty about what's under the yard.
Does a Nassau contractor's old tank closure count for a Suffolk property? No. The Suffolk County Sanitary Code applies to the property's location, not to where a contractor happens to be based. A closure or abandonment done under Nassau's more permissive size rule doesn't automatically satisfy Suffolk's Article 12 standard if the tank is 1,100 gallons or larger.
Is this only an issue for single-family homes? The disclosure form and the county tank rules both apply to residential property broadly, so a legal two-family in Commack faces the same fuel storage tank question and the same Suffolk abandonment threshold as a straightforward split-level.
Selling a home built when Commack was still filling in its cul-de-sacs means selling a house with a history, and that history now has to be written down rather than paid around. Getting the tank question settled before the sign goes in the yard is the difference between a clean disclosure and a conversation that starts after an offer is already on the table.
If you're weighing a sale in Commack, or trying to figure out what your own split-level's paper trail actually says, Mark E Brode Jr can walk through what a clean, well-documented listing looks like before it ever reaches a buyer's attorney. Let's Connect.
