That tidy lawn could be hiding a steel tank — and a cleanup bill your homeowners insurance won’t touch.
New England Runs on Oil — and That’s the Problem
Heating oil warms roughly 65% of homes in Maine — the highest share of any state in the country — and about 46% of homes in New Hampshire. For generations, that oil was stored in steel tanks, and in thousands of older properties from Portland and Gorham to Rochester and Dover, those tanks were buried in the yard.
Here’s what many buyers never learn until it’s too late: a buried steel tank installed in the 1960s or 70s has been sitting in damp, acidic New England soil for fifty years or more. Steel rusts from the outside in. When a tank fails, heating oil seeps into the soil — and sometimes into the groundwater that feeds your well or your neighbor’s.
With inventory up sharply across Maine and inspection contingencies back as a normal part of every transaction, 2026 buyers finally have the leverage to check. Most still don’t know they should.
5 Things Every Buyer Should Know
- You inherit the tank — and the liability. If a buried tank is discovered after closing, the cleanup is generally the new owner’s problem, even if the tank was abandoned decades before they bought the house.
- Homeowners insurance usually won’t cover it. Standard policies typically exclude oil contamination of your own soil and groundwater. Remediation for a serious leak can run from several thousand dollars into six figures.
- Lenders and insurers are paying attention. Some mortgage lenders and insurance carriers will delay or decline a property with a known abandoned underground tank until it’s removed or proven sound.
- An “abandoned” tank isn’t a safe tank. Old tanks were often simply disconnected and left in place — sometimes still holding sludge and residual oil that can leak for years.
- Removal is cheap compared to remediation. Pulling a residential tank typically costs $1,000–$2,500. New Hampshire’s Petroleum Reimbursement Fund can even reimburse homeowners up to $4,500 for removing an underground heating oil tank. Contaminated-soil cleanup, by contrast, can cost more than the down payment on the house.
What Buyers and Sellers Should Do
If you’re buying an older home anywhere in southern Maine or the New Hampshire Seacoast, ask one simple question early in due diligence: has this property ever had a buried oil tank? Telltale signs include a fill pipe or vent pipe sticking out of the ground near the foundation, copper lines entering the basement below grade, or an oddly settled patch of lawn.
Sellers benefit just as much from getting ahead of this. A documented tank sweep — or proof of proper tank removal — removes one of the biggest late-stage deal killers in a New England transaction. In a market where buyers are negotiating again, surprises kill closings.
What an Oil Tank Sweep Actually Involves
A professional oil tank sweep is a non-invasive scan of the property using metal-detection equipment to locate buried tanks, abandoned fill lines, and related hardware. At FPI, we walk the perimeter of the home and the likely burial zones, check basement walls and sill areas for legacy supply lines and capped fittings, and document everything with photos in a same-day report. If evidence of a tank turns up, you’ll know before you close — while you still have the contractual leverage to ask for removal, testing, or a price adjustment.
A sweep pairs naturally with a full home inspection, and in well-water country it’s smart to add water testing at the same time, since a leaking tank and a drinking-water well are a bad combination.
For Agents: Make the Sweep a Standard Question
If you represent buyers in Maine or New Hampshire, the oil tank question belongs in your due diligence checklist for any home built before 1990 with oil heat — past or present. A $200–$300 sweep is the cheapest insurance your client will ever buy against a five- or six-figure surprise, and recommending it positions you as the agent who protects clients, not just closings.
For listing agents, encourage sellers of older oil-heated homes to resolve the question before going to market. A clean sweep report in the disclosure package builds buyer confidence and keeps negotiations focused on price, not fear. When a deal is three days from closing, the last thing anyone wants to find is a rusted fill pipe behind the rhododendrons.
Buying an Older Home in Maine or New Hampshire? Scan Before You Sign
Focused Property Inspections performs oil tank sweeps across southern Maine and New Hampshire, alongside full home inspections, radon testing (air and water), well water and PFAS testing, septic inspections, and sewer scopes. Veteran-owned, with same-day digital reports so you can negotiate while your due diligence clock is still running.
Schedule your inspection and oil tank sweep today.
📞 833-FPI-INSP (833-374-4677) | fpi-web.com
(207) 839-6595 for Maine and New Hampshire inspections
Focused Property Inspections — Veteran-Owned. Client-Focused. Detail-Driven.