Lift station pumping and wet well service in Victoria
A wet well is the one part of a system with moving parts in it, so it fails without warning rather than gradually. Pumping it is half the job: the floats and the alarm are the half that prevents the next callout.
Most wet well failures are not worn-out pumps. They are rag balls wrapped around an impeller, a grease mat thick enough to hold a float in position, or a float cable that has drifted and no longer switches where it should. All three are visible once the well is drawn down, which is why the pump out and the inspection are one visit.
Left alone, the same three take out the pump itself, and a burnt-out pump on a site with no storage is an overflow within hours. That is why the visit includes exercising the floats and triggering the alarm rather than just emptying the well. Component replacement is covered on pump and float replacement.
Where a kitchen discharges into the well, the grease mat is the pacing item and the interval is really being set by the grease trap upstream, not by the pump.
Wet well service
How it works
How a wet well visit runs
Read the panel first
Run hours, cycle counts and any fault history, because the panel usually says what the well is about to do.
Draw the well down
Contents removed, then the rag and grease mat cleared off the walls and away from the float cables.
Exercise floats, test the alarm
Each float run through its range, switching confirmed, and the high-level alarm triggered and reset.
Record and report
Pump condition, run hours and anything drifting toward failure written down, with a quote if action is needed.
Why the alarm matters more than the pump
A working alarm turns a flood into a phone call
Pumps fail. That is expected and it is survivable, because a working high-level alarm gives hours of warning and a site can reduce inflow while a replacement pump is fitted. An alarm that has been muted, unplugged or never tested turns the same failure into an overflow.
So the alarm gets triggered on every visit, not assumed. On commercial sites that alarm is the difference between a scheduled repair and an incident report, which is why it sits at the centre of lift station service.
Sites with more than one chamber, or with storage upstream, are scheduled together under commercial pumping so nothing is left to a separate visit.
It depends on what discharges into it and how hard the pumps run, so the interval comes from run hours and observed build-up rather than a fixed period. Sites with kitchens upstream need it far more often.
Usually a float stuck in the on position, an impeller fouled so it moves little volume, or inflow exceeding pump capacity. All three are diagnosed at the well rather than guessed at.
Every visit, by triggering it rather than assuming it works. A muted or dead alarm is the single most common reason a pump failure becomes an overflow.
Wipes labelled flushable are the usual source, and they do not break down. On shared or commercial sites it only takes one user. The well tells you honestly what is going down the drains.
No. A tank separates solids and lets effluent leave by gravity; a wet well collects and pumps it uphill. Many systems have both, and they are serviced differently.
