Oil Tank Removal in Somersworth, NH: Cost, NHDES Rules & Contractors

A mill city with an older-than-average housing stock

Somersworth grew up around the Great Falls textile mills on the Salmon Falls River, directly across from Berwick, Maine, and much of its residential housing near the historic downtown and surrounding neighborhoods dates to the mill era and the decades that followed — well before natural gas service reached most of southern New Hampshire. Homes from that period were commonly built with a 275-gallon or 550-gallon bare steel tank buried in the yard or installed in the basement, and a later conversion to another heat source rarely included removing the old tank.

A tank that has been in the ground since the mill era is now well past the point where corrosion becomes a realistic concern rather than a hypothetical one. If you've never had your Somersworth property swept and it predates 1980, that's worth doing before you assume there's nothing to find.

Somersworth oil tank removal cost breakdown

These figures track the statewide New Hampshire range. Somersworth's distance from the Manchester and Nashua contractor base can mean a modest mobilization fee on top of the removal itself, though the Dover-Rochester area immediately south has enough contractor coverage that this is usually minor compared to towns further north or west.

NHDES rules and why private wells raise the stakes

New Hampshire requires underground tank removal to be performed by a licensed oil burner technician under NHDES's Env-Or 400 rules — a different credential than a standard excavation license, and one worth confirming before you hire. The contractor notifies NHDES before starting, collects soil samples at the tank pit, and files a closure report, generally within 90 days of the work.

Strafford County has more municipal water coverage than New Hampshire's more rural interior, but properties on the outskirts of Somersworth and in the surrounding towns still commonly rely on private wells drawing from fractured bedrock aquifers. A leak that would be a contained, single-property problem in a town with municipal water can travel along rock fractures toward a neighbor's well in a well-dependent area — which is why a properly licensed technician samples soil at the base and both sidewalls of the excavation as standard practice, not just when something looks visibly wrong.

If contamination is confirmed, the NHDES Oil Fund can help offset cleanup costs for eligible releases — one of the more generous state cleanup assistance programs in New England — but it's built to reimburse documented contamination, not to subsidize a routine, clean removal.

Finding a contractor in Somersworth

Townsend Energy is based in Somersworth and is one of the local providers listed in our directory alongside other Strafford County fuel and service companies. As with any tank job, get more than one written quote and ask each contractor directly whether soil sampling and NHDES closure paperwork are included in the price or billed separately if something turns up — that distinction explains more quote-to-quote variation than the removal itself does.

For statewide DES rules, reimbursement programs, and other New Hampshire cities, see our New Hampshire oil tank removal guide or the statewide New Hampshire contractor directory.

Frequently Asked Questions