A pumping visit locates the tank and its access lid, opens it, vacuums out both the liquid and the settled solids, and checks the condition of the baffles and any effluent filter before closing it back up. A good pumper also gauges the scum and sludge layers and tells you roughly how much longer the tank would have gone before pumping was needed.
The truck pumps essentially everything out of the tank, not just the sludge at the bottom, because the settling process has to start fresh; leaving liquid behind and only pulling solids does not reset the tank properly.
While the tank is open the pumper is also the one person routinely looking at its condition: whether the inlet and outlet baffles are intact, whether an effluent filter is fitted and needs cleaning, and whether the tank shows cracking or structural wear. This is the cheapest regular inspection point the system gets, which is why a pumper who reports back on tank condition is worth more than one who just empties it and leaves.
If the lid is buried, locating and uncovering it is part of the job, and it is the single biggest reason two quotes for the same tank size can differ — a tank with a riser to grade is a five-minute uncover, a buried one is a dig.
We hold recorded septic as-built drawings and parcel-level septic-versus-sewer classification for thousands of US counties. Look up where records are kept for a specific county, or open the interactive parcel map to check a property directly.
Find your county’s septic records Open the parcel map
Both the liquid and the settled solids are typically vacuumed out, so the tank starts its settling process fresh rather than partway full.
A thorough one will: while the tank is open they can see baffle condition, filter condition, and structural issues, and should report anything they find.
If there is no riser bringing the lid to ground level, the tank may be buried under a foot or more of soil, and locating and uncovering it is extra labor billed on top of the pump-out.
Guide last reviewed 2026-08-31.