What Is an Underground Storage Tank and Why Does It Matter in New Hampshire Real Estate?

🏡 What Is an Underground Storage Tank and Why Does It Matter in New Hampshire Real Estate?

Underground storage tanks (USTs) are more common in New Hampshire than many buyers realize. Older homes, rural properties, and lake-area cottages often have abandoned or buried tanks that once held heating oil, diesel, or gasoline.

Because hidden tanks can impact safety, inspections, and financing, NH buyers and sellers should understand the risks and requirements.

⭐ What Is an Underground Storage Tank?

An underground storage tank is any fuel tank where 10% or more of the tank is buried below ground.

These were commonly used for:

✔ Heating oil

✔ Diesel

✔ Gasoline (farm or workshop use)

✔ Old mechanical systems

Many NH properties still have undocumented or unknown buried tanks.

⭐ Why Underground Tanks Matter in NH Real Estate

Buried tanks can create serious concerns:

✔ Environmental contamination

✔ Soil pollution or leaks

✔ Strong odors in basements or yards

✔ Insurance complications

✔ Financing issues (certain lenders will not fund a home with an active UST)

✔ Expensive remediation

A leaking tank can cost thousands to remove and clean.

⭐ How Buyers Can Tell If a Property Might Have a Buried Tank

Signs include:

✔ Copper lines entering the foundation

✔ Abandoned fill pipes outside

✔ Metal caps near driveways or lawns

✔ Historical fuel usage

✔ Older properties built before the 1970s

Home inspectors often flag this for further evaluation.

⭐ What Sellers Should Do Before Listing

Sellers can prepare by:

✔ Disclosing any known tanks

✔ Checking for unused fill pipes

✔ Providing removal documentation if a tank was eliminated

✔ Ordering a tank scan (optional but helpful)

✔ Reviewing any historical permits

If a tank is suspected, addressing it early avoids delays during escrow.

⭐ Are Underground Tanks Allowed in NH?

Yes — but with strict requirements.

Most residential heating oil tanks above-ground are preferred today.

If a buried tank is:

✔ Active: it must meet safety standards

✔ Inactive: it should be removed or properly closed

✔ Leaking: it must be remediated immediately

The NH Department of Environmental Services (NHDES) has guidelines for proper closure.

⭐ What Does Removal Cost?

Costs vary depending on condition:

✔ Standard removal: $1,500–$3,000

✔ Tank filled with sand or sludge: higher

✔ Leak requiring soil cleanup: can exceed $10,000+

Buyers should negotiate who pays for removal if a buried tank is discovered.

⭐ Bottom Line

Underground storage tanks are a serious consideration in New Hampshire real estate. Whether you’re buying or selling, it’s important to identify buried tanks early, understand legal requirements, and ensure the property is safe and compliant before closing.

Jim Johnson Real Estate

Phone: 857-249-7392

Serving Plymouth, Campton & Central New Hampshire

Brokered by Three Hills Real Estate Service