Unexpected Underground Oil Tank Leak: Our Experience and What We Learned

Surprise — this is what we found at our house yesterday:

We tested the soil around our home’s underground oil tank a few weeks ago to reassure any potential buyer that everything was in good condition. The results were the opposite of comforting: the soil test indicated a small leak. It felt like a punch in the gut. We pride ourselves on being environmentally conscious — we have a rain barrel, a compost bin, energy-efficient appliances and cloth diapers — so discovering that an aging oil tank had been leaking underground without our knowledge was disheartening.

Fortunately, the Virginia Department of Environmental Quality (DEQ) has a program to help homeowners in this situation. Because of that support, we only had to pay a $500 deductible for the removal of the old underground tank and the contaminated soil immediately around it, while the state covered most of the remaining cost of what is normally a roughly $2,000 project. That was a relief, but we still paid about $1,300 to install a new above-ground tank. The upside is that an above-ground tank is visible and far less likely to leak undetected in the future, and by installing it we’re leaving the house in better shape for the next owners. Our new tank sits tucked quietly behind the azaleas and looks much safer than the old buried one.

Old Tank, New Problems

When the crew unearthed the old tank, they estimated it was about 30 years old. Despite its outward appearance, the leak they could locate was roughly the size of a dime at the bottom of the tank. It’s possible there were other small openings concealed by dirt and corrosion, but the visible damage was surprisingly small compared with how nasty the surrounding soil looked.

One reason this was contained and less severe than it might have been is the composition of our yard. The compacted soil in this area limits how far heating oil can migrate, so the contamination didn’t spread widely. For that reason the DEQ required removal of the tank and only the contaminated soil immediately surrounding it. That said, “a bit of soil” is understatement — the hole they dug was quite substantial.

Digging Up the Problem

The excavation required a large hole and the temporary removal of two azalea bushes. Thankfully the driveway and large trees were not disturbed. After the contaminated soil was removed, the crew filled the excavation with gravel and topsoil before replanting the azaleas. They were careful and conscientious, though they honestly warned us that they couldn’t guarantee the shrubs’ future survival. We’re crossing our fingers that the plants recover.

What It Cost and What We Gained

Emotionally and financially, handling an unexpected home repair like this is stressful, especially around the holidays. Even so, there are positives: the DEQ assistance significantly reduced our out-of-pocket cost, and the new above-ground tank gives us peace of mind and increases the home’s safety for future owners. Interestingly, the house we’re moving into also just received a new above-ground tank from the previous owners, so we’ll be inheriting a similarly recent installation. Small comforts like that help.

While it was frustrating to spend money fixing a problem we hadn’t known about, we’re relieved that the contamination appears limited and that steps were taken promptly to remove the source and the affected soil. The whole experience was a reminder to check old systems and have soil or tank inspections when buying or selling a house.

Have You Experienced Anything Similar?

Have you ever dealt with an oil leak, buried-tank issue, or any other surprisingly un-green discovery at home? Unplanned expenses and environmental headaches are never fun, but sharing experiences helps others prepare. We’d love to hear about your stories and any advice you learned through the process.

P.S. For a creative project idea: we recently saw a clever DIY play kitchen made from an old TV cabinet — a smart reuse of an item that might otherwise be discarded.