What Septic Tank Pumping Actually Removes
A septic tank is a buried, watertight container that holds wastewater long enough for solids to settle and grease to float. Heavy material sinks into a layer of sludge at the bottom, lighter material forms a scum layer at the top, and the middle liquid flows out to the drain field. Over time the sludge and scum layers grow. Once they take up too much of the tank, solids can escape into the outlet line.
Pumping means a truck with a vacuum hose removes the contents of the tank, including the sludge and scum. A competent pumper also checks the baffles or tees, inspects the tank for cracks or root intrusion, and notes the condition of the outlet. Ask for a written note of what was found, because that record helps you plan the next visit and catches problems early.

