A flashing red light on a grinder pump panel is the first warning that wastewater may soon have nowhere to go but back into the house.
Key takeaways
- The city lists three warning signs: a flashing red light, toilets that do not flush well, and gurgling drains.
- In Brentwood's grinder pump program, homeowners own the pump, tank, controls, piping and valves from the house to the public sewer main.
- Not every Brentwood home uses a grinder pump. The program covers the septic to sewer conversion areas that chose a pressure sewer system.
- In February 2026 the city said a tank can last multiple days with minimal water use during a power outage.
- Sewage that reaches floors and walls is Category 3 water and needs containment, removal and drying, not a mop.
What a grinder pump does in Brentwood
Brentwood chose a pressure sewer system with grinder pumps for its septic to sewer conversion project. A grinder pump sits in a tank at the house, grinds wastewater and pushes it out to the public sewer main under pressure.
The City of Brentwood does not operate water or sewer treatment plants. It contracts with Metro Nashville for sewer treatment and coordinates with Harpeth Valley Utilities District and Metro Water Services for drinking water.
Only the conversion areas are confirmed to use grinder pumps, so a homeowner should know whether the house is on one.
Warning signs the city lists
A grinder pump rarely fails without notice. The city names three signs that something is wrong.
- A flashing red light on the control panel.
- Toilets that do not flush well.
- Gurgling drains.
Who owns what in the system
Ownership decides who calls whom first, so it helps to know the split before a problem starts.
The homeowner's side
In the program, homeowners own the pump, tank, controls, piping and valves from the house to the public sewer main.
That is a larger share than many owners expect, and it includes the tank where wastewater waits.
The city's role
The city maintains grinder pump contents and control panels for enrolled homeowners. A red light is a reason to call the city's water and sewer department.
The city handles the pump system. What the water did to the house is a separate problem, and it belongs to a restoration team.
What to expect when the panel alarms
A red light does not always mean a backup has started. It can mean the tank is filling faster than the pump moves it, or that the pump has stopped.
Treat it as a deadline. Every toilet flush and every load of laundry shortens the time left.
Before the house backs up
The goal is to keep water use low while the city checks the pump. A few quiet hours without laundry or long showers can keep wastewater in the tank and out of the house.
After water appears
Once wastewater shows at a floor drain or a toilet, the job changes from pump repair to cleanup. The sooner the wet area is isolated, the less of the house is affected.
Large homes spread a backup across more floor area, so acting early limits the number of rooms involved.
Power outages and the tank
A grinder pump runs on electricity, so an outage matters. In February 2026 the city said a tank can last multiple days with minimal water use during an outage.
Crews will connect a generator and pump down the tank for homes on a list. Homes not on the list should cut water use sharply until power returns.
- Hold back on laundry, dishwashers and long showers during an outage.
- Flush only when needed.
- Watch the panel and the drains for the warning signs above.
- Call the city if the red light starts flashing.
When wastewater reaches the house
If the tank overfills, the lowest drain in the house is where the water comes out. That may be a floor drain, a basement bath or a ground floor shower.
Sewage is Category 3 water. That rating means it carries bacteria and should be treated as unsafe, so cleanup follows a different order than a clean water leak.
A written record of each step helps with insurance, since a homeowner owns the pump and tank and the policy may treat the loss differently from a city sewer main failure.
What a homeowner should do
Stay out of the wet area and keep children and pets away. Do not run water, since every flush adds to the problem.
- Stop using toilets, sinks and washers.
- Turn off power to the wet area only if the panel is dry and reachable.
- Photograph the water and the damage before anything is moved.
- Call the city about the pump and a restoration team about the house.
What the cleanup includes
The sewage backup cleanup team contains the area and extracts the water. Porous materials that soaked up sewage, such as carpet, pad and wet drywall, are removed because they cannot be made safe.
Surfaces are cleaned and treated with an EPA registered antimicrobial before drying begins.
Drying after the sewage is out
Once the contaminated material is gone, the structure still holds water. Subfloor, framing and the base of walls need drying to a measured goal.
The structural drying team sets air movers and dehumidifiers and takes readings until the framing matches a dry reference.
Brentwood homes tend to be large, so a backup can reach several rooms before anyone notices.
How this differs from a gravity sewer backup
A grinder pump backup comes from a failed or overwhelmed pressure system at one house. A gravity sewer backup after heavy rain, as discussed on the sewage backup cleanup page for Smyrna, usually involves the main.
The cleanup steps are alike, but the first phone call is not. A homeowner on a grinder pump starts with the city, and a restoration team follows for the house.
Brentwood residents can see the town's service details on the Brentwood water damage page.
Questions
What does a flashing red light on a grinder pump mean?
The city lists it as a warning sign. It means the system needs attention, and the homeowner should call the city's water and sewer department.
Who owns a Brentwood grinder pump?
In the city's program, homeowners own the pump, tank, controls, piping and valves from the house to the public sewer main.
How long can a grinder pump tank last in a power outage?
In February 2026 the city said a tank can last multiple days with minimal water use. Crews will connect a generator and pump down the tank for homes on a list.
Do all Brentwood homes use grinder pumps?
No. Only the septic to sewer conversion areas that chose a pressure sewer system are confirmed to use them.
Can a sewage backup be cleaned up with a mop and bleach?
No. Sewage is Category 3 water. Porous materials are removed, surfaces are treated with an antimicrobial, and the structure is dried to a measured goal.