Short answer
Contact the Pennsylvania DEP right away. DEP's guidance says it is the tank or property owner's responsibility to notify the right regional office of the location and extent of the release. DEP also describes a reimbursement program for underground heating oil tanks of 3,000 gallons or less.
Report it
DEP's tips for residential heating oil tank owners say to contact the Department of Environmental Protection immediately after a release. The page says it is the responsibility of the tank or property owner to notify the appropriate DEP regional office of the location and extent of the release. Waiting until a buyer finds it makes things harder for everyone.
Get professionals
The guidance recommends professionals to determine the extent of contamination, prepare a cleanup plan and clean up the site. Ask for more than one quote and get scope and price in writing. Save every invoice, since you may need them for the buyer, your insurer or a reimbursement claim.
Reimbursement
DEP says it has a reimbursement program to help tank owners with the cost of corrective action after a release from an underground heating oil tank with a capacity of 3,000 gallons or less. The page we reviewed does not list the deductible or the cap, so check the DEP program page for current terms and for who may apply.
Disclosure and timing
A known leak is the kind of fact the seller disclosure form asks about under the hazardous substances heading in section 7304. Section 7307 says if information disclosed becomes inaccurate before settlement, the seller must notify the buyer. Talk to an environmental professional and an attorney before listing. This page is general information and not legal advice.
Selling for cash instead
Cleanup can stretch the timeline, and some owners prefer a buyer who can take the property as-is. You can also ask Kaizen Home Buyers for a cash offer. We buy as-is, with no repairs and no agent commission, make offers within 24 hours and close in 14 to 30 days or on the date you set. Reach us at 267-329-0084.