What it means
When gravity cannot carry wastewater to the next point, a wet well collects flow and pumps lift it into a force main or higher sewer. Lift stations need reliable pumps, level controls, alarms, backup power planning, and maintenance.
What operators watch
- Pump cycling, wet-well level, alarms, and run time reveal station behavior.
- Rags, grease, and grit can clog pumps or affect controls.
- Failure can quickly create backups or sanitary sewer overflows.
Common exam traps
- Confusing a lift station with a water booster station.
- Ignoring wet-well ventilation and confined-space hazards.
- Assuming redundant pumps remove the need for inspection.
Field example
If one pump runs much longer than the other, operators may check pump capacity, check valves, controls, and force-main conditions.
