Your seller checked “no” on the underground tank question. Two weeks into the contract, the home inspector walks behind the house and finds an old oil tank in the ground. Your phone rings. Here is what you and your seller each owe, in plain order.

In short:

Disclose the tank to the buyer. The Commission treats an underground tank as a material fact, even with no sign of a leak.
Your seller has to correct the disclosure statement. Yours and theirs are separate duties. One does not cover the other.
A home heating oil tank does not have to be removed or filled. The seller can say no if the buyer asks.
Signs of a leak change everything. That means a call to the state, fast.

Is this really your problem as the listing agent?

Yes. Under Commission Rule 21 NCAC 58A .0114(c), a broker must disclose to the purchaser any material fact the broker knows or reasonably should know about the property. The same rule says the broker’s duty is separate from the owner’s, and the owner’s disclosure statement does not satisfy it.

Once the inspector found the tank, you know. A buried tank is the kind of thing a reasonable buyer would want to hear about. The buyer may face cleanup costs down the road, and that is exactly what a material fact is. NC REALTORS says the Commission takes this position even when nothing suggests a leak.

Put it in writing. Tell the buyer’s agent, and keep a record that you did.

What does the seller have to do?

The seller filled out the Residential Property and Owners’ Association Disclosure Statement and said no. That answer is now wrong. NC REALTORS points to G.S. 47E-7, which requires a seller who finds a material inaccuracy in a statement already delivered to promptly correct it and give the buyer an updated one. The statute also gives the buyer remedies if that does not happen.

Here is the trap. Your disclosure to the buyer does not fix the seller’s form. You each have your own job. Make sure the seller updates the statement, and do it before the conversation gets complicated.

If the seller truly does not know the tank’s condition, the updated form can say “no representation” on that question. That does not let you off the hook. You still disclose the tank.

Does the seller have to remove the tank or test the soil?

Usually not, for a home heating oil tank. Here is how it breaks down.

Home heating oil tanks are non-regulated. NC DEQ treats them as non-commercial tanks that are exempt from the “closure” rules for commercial tanks. Closure means pulling the tank or filling it with something solid like sand.
So the seller can refuse. If the buyer demands removal or filling, the seller does not have to agree. It is a negotiation item, not a legal requirement.
No leak evidence, no testing duty. Without signs of a leak, spill, or contamination, the seller does not have to call the state or test the soil.

DEQ still advises owners to empty an unused tank to reduce the chance of a release. It also says not to fill a tank with water. And it notes that buyers are often nervous about tanks, so removal can help resale. That is useful advice for your seller if the deal is wobbling.

What if there are signs of a leak?

Stained soil. A strong petroleum smell. Puddles of oil. Now the seller has real obligations.

Hire a qualified environmental consultant to inspect the tank and find out whether it leaked.
If there is contamination, notify the regional office of the DWM UST Section. DEQ’s FAQ says to do this within 24 hours of discovering signs of a leak, spill, or contamination. NC REALTORS words it as “promptly.” Treat it as a same-day call.
If the state finds the seller responsible, that office tells the seller what sampling and cleanup is needed.

Who is responsible for cleanup is not always the current owner. DEQ says it depends on the “statutory tank owner,” which turns on when the tank was last used. That is a question for an attorney, not for you.

One more practical point. If the tank is removed, some local fire inspectors regulate removal. DEQ says to check with the local office first.

A checklist for the next hour

Call your broker-in-charge.
Disclose the tank to the buyer’s agent in writing.
Have the seller correct and deliver the disclosure statement.
Ask the seller about any leak signs: stains, odors, oil.
If there are signs, get an environmental consultant and make the call to the DWM UST regional office.
If there are no signs, expect the buyer to ask for removal or a price change, and know that the seller can decline.
Document every step with dates.
Send the seller to an attorney for anything about liability or cleanup responsibility.

Bottom line

This one is not hard if you move in the right order. Disclose first. Fix the form second. Then deal with the buyer. The agents who get hurt are the ones who sit on it, hoping the buyer does not notice. The inspector already did. Your job now is to be the one who says it out loud.

This is the kind of real-world disclosure problem we work through in our NCREC-approved classes. See the schedule at brianpateseminars.com.

This post is general information, not legal advice. Talk to your broker-in-charge or an attorney about your situation. Sources: NC REALTORS legal Q&A (October 2026), NC DEQ Division of Waste Management UST Section FAQ on home heating oil tanks, and 21 NCAC 58A .0114.

Frequently Asked Questions

Does a buried heating oil tank have to be disclosed if it is not leaking?

Yes. The Commission treats an underground storage tank as a material fact, so the listing agent must disclose it even when there is no sign of a leak. The buyer could face cleanup costs later.

Can the seller just fix the disclosure statement and skip telling the buyer’s agent?

No. The broker’s duty to disclose is separate from the owner’s. An updated statement from the seller does not replace the agent’s own disclosure.

Does the seller have to remove or fill a home heating oil tank?

No. Home heating oil tanks are exempt from the closure requirements that apply to commercial tanks, so the seller can decline a buyer’s request. DEQ still suggests emptying an unused tank and notes that removal can help resale.

Does the seller have to test the soil?

Not unless there is evidence of a leak, spill, or contamination. If there is, the seller should hire an environmental consultant and notify the DWM UST regional office.

How fast do you have to report a leak?

DEQ’s home heating oil tank FAQ says to notify the regional DWM UST office within 24 hours of discovering signs of a leak, spill, or contamination. NC REALTORS says promptly. Call the same day.

Who pays for cleanup?

It depends. DEQ looks to the statutory tank owner, which depends on when the tank was last used. Send the seller to an attorney for that question.

The Inspector Found a Buried Oil Tank. Now What?