What an ejector pump is
In most homes, wastewater flows downhill to the sewer by gravity. But when a basement bathroom, bar sink or laundry sits below the level of the main sewer line leaving the house, gravity can't do the job. Instead, those fixtures drain into a sealed basin, usually set into the basement floor with a tight-fitting lid and a vent pipe. Inside is an ejector pump, sometimes called a sewage ejector. When the basin fills, a float turns the pump on and it pushes the wastewater up and into the main line.
Ejector systems are common in Northern Virginia's finished basements, especially in homes where a bathroom was added when the lower level was built out. They're also found in some townhouses and small multi-unit buildings, where a single basin may serve more than one fixture group.
How it differs from a sump pump
The two are easy to confuse, because both are pumps in a pit in the basement floor. A sump pump handles groundwater and usually sits in an open pit or one with a loose lid. An ejector pump handles wastewater from toilets and drains and sits in a sealed basin with a vent. The distinction matters a great deal for cleanup, because the water involved is different.
| Feature | Sump pump | Ejector pump |
|---|---|---|
| What it moves | Groundwater from around the foundation | Wastewater from a below-grade toilet, shower or laundry |
| Where it sits | An open or lidded pit in the basement floor | A sealed, vented basin |
| When it runs | After rain or while groundwater is high | Whenever lower-level fixtures are used |
| If it fails | Clean water rises from the pit | Wastewater backs up into the lower level |
| Cleanup | Usually handled as clean water | Handled as contaminated water |
What people notice first
- A basement toilet, shower or floor drain backing up or gurgling.
- A high-level alarm sounding from a small box near the basin.
- A sewage smell in the basement bathroom or around the basin lid.
- Water pooling around the basin, or seeping from under the lid.
- A pump that runs constantly, or cycles on and off rapidly.
If you rent, the first sign may be a tenant reporting a smell or a slow drain. In a townhouse or small building with a shared basin, more than one household may notice at once. Tell the landlord, the association or the building engineer promptly.
Why ejector pumps fail
- Things that shouldn't be flushed. So-called flushable wipes, paper towels, feminine products and dental floss wrap around the pump impeller or jam the float. This is the most common cause.
- A stuck or failed float. If the float can't rise, the pump never turns on.
- Power loss. Without power, the basin simply fills.
- A worn pump. Ejector pumps work in a harsh environment and have a finite service life.
- A failed check valve. Wastewater falls back into the basin after each cycle, overworking the pump.
- Grease buildup. Laundry and bar sinks send grease and lint into the basin over time.
- A blocked main line. Sometimes the ejector is fine and the main line it pumps into is blocked, which can look the same from inside the basement.
Shared basin in a townhouse row or small building? We'll coordinate.
Managing a Building? Call UsThe first hour, and who to tell
Stop all water use in the house, because every fixture adds to the overflow. Keep people and pets out of the affected room and close the door. A plumber is needed to clear or replace the pump; the restoration crew handles the water damage.
Tell anyone who shares the system: a tenant in the basement, neighbors on a shared basin, the association or management office in a townhouse or condominium. Contact your own insurer as well. What applies depends entirely on your individual policy and the circumstances, and only your insurer can tell you. Photographs taken from the doorway, and the restoration contractor's documentation of the work, are generally useful records.
Why this water is treated differently
Restoration work sorts water into three categories. Category 1 is clean water from a supply line. Category 2 carries some contamination, like washing machine discharge. Category 3 is grossly contaminated, and that includes wastewater from toilets and drains. Water from a failed ejector basin is Category 3.
In practice, that changes the approach. Porous materials the water soaked into, such as carpet, pad, the lower portion of drywall, insulation and upholstered furniture, are generally removed rather than dried. Hard surfaces are cleaned and treated before drying starts. The crew wears protective equipment, and the work area is contained so it isn't spread through the house.
How ejector pump cleanup is done
- Containment. The affected area is sealed off with plastic sheeting, and a clean path is set up for the crew to move in and out.
- Removing the water. Standing wastewater is extracted and disposed of properly.
- Removing porous materials. Carpet and pad, affected drywall and insulation, and soaked baseboards are cut out and bagged.
- Cleaning. Floors, remaining wall surfaces, fixtures and framing are cleaned and treated with an appropriate cleaning agent.
- Drying. With contaminated material removed, the remaining structure is dried with dehumidifiers and air movers until readings reach dry references.
- Final check. The crew confirms cleaning and drying before containment comes down.
We'll tell you honestly when a crew can reach you.
Get a Crew Out TodayWhat affects time and cost
The spread of the water, what it reached, and how much has to be removed are the main factors. A backup confined to a tiled bathroom is a much smaller job than one that ran under a door into a carpeted family room. Containment, protective equipment and disposal add to the work compared with a clean-water loss.
You get a price for that scope upfront, before anyone starts, and there are no hidden fees.
Hear the scope and the number before work starts.
Call for Upfront PricingAfterward: keeping it from happening again
- Put a small bin next to every basement toilet and ask everyone, including guests and tenants, to use it for wipes and paper products.
- Have the basin inspected and cleaned periodically, as the pump manufacturer or your plumber recommends.
- Make sure the high-level alarm works and can be heard from upstairs.
- Consider a battery backup if power cuts are common where you live.
- Keep grease out of bar and laundry sinks that drain to the basin.
Related services
Ejector pump failures: common questions
How do I know if I have an ejector pump?
If your basement has a toilet, shower or laundry and there's a sealed round lid in the floor nearby, often with a pipe rising from it and a small alarm box on the wall, that's likely an ejector basin. Homes whose main sewer line exits below the basement floor may not need one.
Can I keep using the upstairs bathrooms?
Usually not until the problem is diagnosed. In many homes, the upstairs fixtures drain by gravity and don't pass through the ejector, but if the main line is the real blockage, upstairs water will come out at the basement drain. Stop all water use until a plumber confirms which it is.
Can the carpet be cleaned instead of replaced?
Carpet and pad soaked by wastewater from an ejector basin are generally removed, not cleaned. Restoration practice treats this water as grossly contaminated, and porous materials it soaks into can't be reliably returned to their original condition.
Why is the crew wearing protective gear?
Because they're handling wastewater and contaminated materials. Protective equipment and containment are standard practice for this kind of loss and help make sure nothing is carried into the rest of the house.
The alarm is going off but nothing has overflowed yet. What should I do?
Stop all water use immediately. The alarm means the basin is filling above its normal level, often because the pump isn't running. Call a plumber to look at the pump. If you stop using water quickly, you may avoid an overflow altogether.
Is this the same as a sewer backup?
It can look the same from inside the basement. An ejector failure is a problem with the pump lifting wastewater out of the basin. A sewer backup is a blockage in the main line or the public sewer. A plumber can tell the two apart; the cleanup approach is similar.
Our basement unit is rented. What do I tell the tenant?
Ask them to stop using water and keep out of the affected room, and let them know a plumber and a restoration crew are being arranged. The crew can talk to the tenant about access while you make decisions about the work.
How long before the basement bathroom can be used again?
That depends on the pump repair and the extent of the cleanup. If the backup was limited to a tiled bathroom, it can be relatively quick once the pump is fixed. If it spread into finished rooms, removal, cleaning and drying take several days before rebuilding.
Will there be a lingering smell?
Odor comes mostly from contaminated porous materials and moisture. Once those are removed and the area is cleaned and dried, the smell should go with them. If any remains, it usually points to material that still needs attention.