Sewage Ejector Pump: How It Works and Signs of Failure
A sewage ejector pump is a specialized type of wastewater pump used when a home’s plumbing system can’t rely on gravity to send sewage to the municipal sewer or septic tank. Instead of wastewater flowing downhill on its own, the pump lifts it upward—often from a basement, crawl space, or other lower-than-sewer area.
Understanding what the pump does, and what “normal” looks like, makes it easier to catch problems early—before a minor mechanical issue turns into a messy backup.
What a sewage ejector pump does
Most systems include a basin (or sump) where wastewater collects, a pump that moves it, and controls that turn the pump on when the liquid reaches a certain level. Depending on the setup, the ejector pump may also include a check valve to prevent backflow and a discharge line that routes wastewater to the next step in the drainage pathway.
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