Sewer ejector pump service in Knoxville, TN covers the sealed basin and pump that lift waste from fixtures below the sewer line, usually a basement bathroom or laundry, up to the main drain. A high-water alarm, gurgling, sewage odor or a pump that runs constantly are the signs it needs repair or replacement.
Updated October 2026
How a Basement Ejector System Works
Gravity can't carry waste uphill, so fixtures below the building sewer drain into a sealed basin. When the level rises, a float starts the pump, which pushes waste up a discharge pipe through a check valve into the main drain. The basin is vented so it does not pull traps dry or push sewer gas into the room.
Most failures are the float, the check valve or the pump itself. Zoeller builds many of the pumps we service, Watts check valves are common on the discharge, and the Kohler or Moen fixtures in a basement bath all depend on the basin working. If the room floods from groundwater instead, that is a sump pump problem, a separate system.
What Ejector Pump Work Costs Depends On
Most ejector work is a part or a pump; a new basin is a bigger job.
The simplest and cheapest repair.
Replaced when pumped waste flows back into the basin.
Priced by horsepower and type, ejector or grinder.
Cutting the floor and setting a basin is a larger project.
A missing or wrong vent adds work and cures odors.
Basement Bathroom Ejector
A basement bathroom needs an ejector sized for a toilet, which means a pump that passes two-inch solids and a sealed, vented basin, usually set into the floor. The toilet, sink and shower drain into it, and a laundry can join them. We check that the basin lid is sealed with a gasket, the vent is connected correctly, and the discharge rises to a check valve and a full-port shutoff before joining the main. Most odor complaints about a basement bathroom trace back to one of those three.
Grinder Pump
A grinder pump chops waste into a slurry before pumping it, so it can push through a smaller discharge pipe over a longer or higher run than a standard ejector. It suits a bathroom far from the main stack or a building where the sewer sits well above the fixtures. Grinders are more sensitive to what goes down the toilet: wipes, even the flushable kind, and feminine products wear the cutter and jam the pump. When a grinder trips its breaker, a jam is the usual reason, and forcing it back on burns the motor.
Ejector Alarm and Float
A high-water alarm means the basin is filling faster than the pump empties it, or the pump isn't running at all. The float is the first suspect: it can hang up on the basin wall or its own cord, or the switch can fail. A failed check valve lets pumped waste run back into the basin, so the pump cycles over and over. A burned-out pump hums or stays silent. Until help arrives, stop using every fixture that drains into the basin, including the washer, because the next load has nowhere to go.
Basements, Heavy Rain and Two Separate Pumps
How an Ejector Service Call Runs
- 1
Silence and assess
Alarm checked, basin level and power confirmed.
- 2
Test the float
Switch and float movement checked.
- 3
Check the discharge
Check valve and shutoff inspected.
- 4
Repair or replace
Float, valve or pump replaced, lid resealed.
- 5
Cycle test
Basin filled and pumped down several times.
Signs Your Ejector Needs Attention
Sewer Ejector Pump Service Questions From Knoxville Homeowners
Why is my ejector alarm going off?
The basin is too full: a stuck float, failed pump, bad check valve or blocked discharge. Stop using the basement fixtures and call.
Is an ejector the same as a sump pump?
No. An ejector moves sewage from fixtures; a sump pump moves groundwater. They should never be connected.
Can wipes go into an ejector?
No. Wipes, even flushable ones, jam ejectors and grinders.
How long do ejector pumps last?
It varies with use and what goes down the drain; alarms and new noises are the signs a pump is wearing out.
Why does my basement bathroom smell?
A failed lid gasket, a dry trap or a venting problem, all of them fixable.
Do you build new basement bathrooms?
Yes, including the ejector basin and venting; see bathroom plumbing remodels.
Other Drains & Sewer Jobs We Handle
Sewer Smell & Vent Repair
Sewer gas smell and blocked roof vent.
Sewer Smell & Vent Repair in KnoxvilleSewer Camera Inspection
Pre-purchase sewer scope and locate and depth marking.
Sewer Camera Inspection overviewCast Iron Drain Replacement
Cast iron stack replacement and under-slab building drain.
Cast Iron Drain Replacement overviewEjector alarm going off?
Call any hour, and stop using the basement fixtures until we get there.