Buyer Education
What if the home has a buried oil tank?
A lot of older homes around Seattle and Puget Sound were originally heated with oil, and many were later converted to gas or electric heat without every trace of the old tank being documented. Buyers run into this more often than they expect, and it is worth understanding before it shows up mid-transaction.
Why this comes up so often in older Seattle-area homes
Oil heat was common in this region for decades. When a home switched to a different heat source, the underground storage tank was not always removed right away, and older paperwork does not always survive. A buyer or even a longtime seller may not know a tank is there until an inspection, a title search, or a neighbor mentions it.
What "decommissioned" usually means
Decommissioning generally means the tank was emptied and cleaned, then either removed from the ground or properly filled in place, following state and local requirements. Ideally, that work comes with documentation, such as a decommissioning certificate or a contractor's removal receipt.
Why this can matter for financing and insurance
Lenders and insurers can have questions about potential environmental or liability concerns tied to an undocumented or improperly decommissioned tank. That does not automatically stop financing, but missing documentation can add a review step, and some insurers ask about tank history directly on an application.
Questions worth asking before writing an offer
Ask the seller and listing agent whether a decommissioning certificate or tank removal receipt exists, whether a site assessment was ever performed, and whether title or escrow has any record of a tank on the property. If the home was ever heated with oil, it is worth asking even if nothing is visible above ground.