How to Maintain Your Sewer Ejector Pump

What an Ejector Pump Does

A sewer ejector pump is installed in homes where plumbing fixtures (typically basement bathrooms or laundry areas) are located below the main sewer line level. Because gravity cannot move waste upward, the ejector pump collects sewage in a sealed basin (pit) and pumps it up to the main sewer line when the basin reaches a certain level. The pump is activated by a float switch, similar to a sump pump but designed to handle solid waste. These systems are essential and their failure results in immediate sewage backup.

Regular Maintenance Tasks

Check the ejector pump every three months by listening for it to activate when the basement fixtures are used. The pump should turn on smoothly, run for 10 to 20 seconds, and shut off cleanly. Test the float switch by pouring several gallons of water into the basin — the pump should activate. Verify that the check valve on the discharge pipe is functioning (this prevents pumped waste from flowing back into the basin). Clean the vent pipe that extends from the sealed basin to the outside — this pipe prevents pressure buildup and allows the pump to operate efficiently.

Warning Signs of Problems

Signs that your ejector pump needs attention include unusual noises (grinding, humming, or clicking), the pump running for unusually long periods, the pump cycling on and off rapidly (short cycling), sewage odors near the basin, or the pump failing to activate when fixtures are used. Short cycling often indicates a stuck float switch or incorrect float position. Continuous running suggests the pump cannot keep up with inflow or the check valve is failing, allowing pumped waste to return to the basin.

Pump Replacement

Ejector pumps typically last 7 to 10 years with proper maintenance. When replacement is necessary, turn off the circuit breaker, disconnect the discharge pipe at the union fitting above the check valve, and disconnect the electrical supply. Lift the old pump from the basin and install the new pump, ensuring the float switch has adequate clearance to move freely. Reconnect the discharge pipe with a new check valve (always replace the check valve with the pump). Test thoroughly by running water from basement fixtures and verifying the pump activates, pumps, and shuts off properly.