Oil Tank Removal Cost by Size: 275, 550 & 1,000-Gallon Tanks

Cost by Tank Size at a Glance

These are national ranges for a straightforward job with no contamination found. Add soil sampling and paperwork, which most quotes already fold in, and add a much larger number — commonly five figures — if the sample comes back dirty. Contamination cost is driven by how far oil has spread, not by the original tank size.

Why Size Moves the Price

A bigger tank means a bigger hole. Beyond a certain size, the excavator has to dig wider as well as deeper to get equipment and a crew safely around the tank while it's lifted, and a 1,000-gallon tank simply displaces more soil than a 275-gallon one — soil that has to go somewhere temporarily and then come back as backfill. More volume in and out of the hole means more time on site and, in a lot of markets, a bigger disposal fee for the tank itself, since scrap and hazardous-material haulers often price by weight or by tank category rather than a flat rate.

Depth compounds this. Older 550 and 1,000-gallon tanks were frequently installed deeper than 275-gallon tanks, partly because larger tanks were more often set below the frost line year-round rather than added later as a smaller supplemental tank. A deeper tank needs sloped or shored excavation walls to meet safety requirements, which eats into the footprint even further.

Where Size Stops Being the Main Driver

Past a certain point, access and soil condition matter more than the extra gallons. A 275-gallon tank wedged under a deck or three feet from a foundation wall can cost more to remove than a 1,000-gallon tank sitting in an open backyard with room to maneuver an excavator — because the small tank in the tight spot may require hand digging, temporary shoring, or removing a structure to get equipment in. Rocky or ledge-heavy soil adds cost to any size tank, and it adds proportionally more to the bigger dig a 1,000-gallon tank already requires.

This is why two quotes for the same size tank can differ by $1,000 or more: the tank size sets a baseline, but the contractor is really pricing the hole, not the tank.

The 1,100-Gallon Line: When Tanks Get Treated Differently

A lot of state petroleum-storage programs — New York's PBS regulations among them — set a registration threshold around 1,100 gallons, above which a tank is treated as a regulated bulk storage tank rather than a small residential heating tank, even on a single-family property. A 1,000-gallon residential tank sits just under that line in most states, but it's common enough for contractors to double-check the actual capacity before quoting, since a tank that turns out to be 1,100 gallons or more can trigger extra registration steps that a straightforward 1,000-gallon job wouldn't need.

If your property has a 1,000-gallon-class tank and you're not certain of the exact capacity, ask your contractor to confirm it early — it affects both the permit paperwork and, in some states, which agency signs off on the closure.

How the Job Scales With Size

1. Locate and confirm size. A tank sweep or existing records give a working estimate before the crew arrives.
2. Excavate. Machine size and dig time scale up with tank volume and depth — this is where most of the size-driven cost lands.
3. Pump and lift. Larger tanks may need a bigger lifting rig and, occasionally, cutting the tank into sections if access is limited.
4. Soil sampling. Sampling cost is largely flat regardless of tank size — the same number of samples is typically taken from the tank grave.
5. Backfill and closure. More excavated volume means more backfill material and, often, more time compacting it properly.

A 275-gallon underground job commonly wraps in a half-day to a day; a 1,000-gallon buried tank in a normal-access yard typically runs a full day. Add extra time for either size if access is tight or if the soil sample comes back showing contamination.

Above-Ground vs. Underground of the Same Size

Size for size, above-ground removal is always cheaper because there's no excavation. A 275-gallon basement tank removal is largely a matter of draining, disconnecting, and hauling it out — often a few hundred dollars less than the same 275-gallon tank buried in the yard. Above-ground tanks over roughly 275 gallons are uncommon in residential settings, which is one reason the underground column dominates the cost table for 550-gallon and larger tanks. For a deeper breakdown of the above-ground side specifically, see our above-ground oil tank removal cost guide.