Why Does My Sump Pump Keep Running?
A sump pump, an essential appliance for homes with basements or crawlspaces prone to water intrusion, is a specialty of T&J Rooter Service, known for their expertise in Sump Pump Installation and Replacement. It works by pumping water away from the foundation of your home to prevent flooding.
Normally, a sump pump will turn on when the water level in the sump pit rises high enough to trigger the float switch. Once the water is pumped out, the switch turns off the pump until it's needed again. Having your sump pump constantly running is usually a sign of a problem.
Here are some of the most common reasons why your sump pump keeps running and how to troubleshoot the issues:
1. Blocked Discharge Pipe
The discharge pipe carries water pumped from the sump pit away from your home's foundation. If it becomes clogged with debris, sediment buildup, or freezes over, water can't exit properly. This will cause water to back up in the pit, making the pump run continuously.
Signs of a blocked discharge line:
Water spraying out of vent holes in the pipe above ground
Reduced flow from the outlet
Loud humming noise from the pump straining
To fix it:
Use a drain snake to clear any clogs
Check for crushed or kinked portions of pipe
Make sure the pipe outlet is not blocked by snow, ice, leaves, etc.
Prevent clogs by installing a check valve and keeping the end of the pipe protected with a screen to filter debris.
2. Malfunctioning Float Switch
The float switch triggers the pump to turn on when water reaches a certain level in the sump pit. If it gets stuck, disconnected, or obstructed, it can't accurately sense water levels.
Signs of float switch issues:
Pump constantly running even when pit is empty
Pump won't turn on even when water is present
Float rod appears crooked or unattached
To fix it:
Carefully detach float switch and check for obstructions
Straighten float rod if bent
Clean off any debris stuck to float or switch
Replace float switch if defective
Prevent issues by routinely inspecting float switch and keeping sump pit clean of sediment.
3. Faulty Check Valve
A check valve prevents water from flowing back into the sump pit after being pumped out. If it fails, water will continuously re-enter the pit and trigger the pump.
Signs of a bad check valve:
Water leaks back into the pit when pump shuts off
Noises indicating backflow
Visible cracks or damage on valve components
To fix it:
Inspect, clean and reposition check valve
Replace any broken or worn out seals or flappers
Install new check valve rated for sump pump size
Maintain the check valve by cleaning sediment buildup and lubricating the flapper as needed.
4. Incorrectly Sized Sump Pump
If your sump pump doesn't have the capacity to handle the amount of water entering your pit, it will run non-stop.
Signs of undersized pump:
Pump runs frequently but water level remains high
Pump works overtime during heavy rains
Water overflows from the pit
To fix it:
Calculate rate of water flow into the pit
Match pump capacity to highest potential water volume
Upgrade to higher power/gallon-per-minute pump if needed
Consult a plumber to ensure your pump is adequate for your home's requirements. Oversized pumps waste energy.
5. Excessive Inflow of Groundwater
Large volumes of groundwater seeping into the sump pit from the surrounding soil can overwhelm the pump. This causes constant run times.
Signs of excessive groundwater:
Pit fills rapidly even without recent rains
Pump runs frequently without much surface water
Must pump water several times a day
To fix it:
Check sump pit for cracks allowing water intrusion
Apply hydraulic cement to seal foundation cracks
Install interior drainage system to divert water
Extend downspouts and grading to improve drainage
Reduce groundwater with proper rainwater management and by sealing cracks in foundation walls and floor.
6. High Water Table
A naturally high water table around your home will cause more groundwater pressure and seepage into the basement or crawlspace. This continually activates the pump.
Signs of high water table:
Pit water recharges quickly after pumping
Constant dampness in basement or crawlspace
Water seen oozing through foundation walls
To fix it:
Install a perimeter drain and sump pump system
Apply waterproof sealant on foundation exterior
Improve rain drainage away from structure
Consider a backup battery pump during power outages
Correcting a high water table is difficult without professional drainage improvements. Waterproofing helps manage symptoms.
7. Leaking Pipes or Cracks in Pit
Leaks from household pipes or the sump pit itself can send water into the basin, triggering the pump. Slow drips are often not visible at first.
Signs of pit leaks:
Pump runs frequently without rain or moisture
Unexplained wetness in sump pit area
Visible dripping from pipes or foundation cracks
To fix it:
Inspect pipes, joints, walls for moisture and drips
Repair leaking pipes and seal foundation cracks
Check sump pit liner for punctures or deterioration
Replace sump pit if liner is badly damaged or leaking
Prevent leaks by sealing foundation, monitoring pipes, and installing a quality sump liner.
8. Failed Sump Pump
If the pump motor, impeller, or internal switch fail, the pump won't be able to empty water from the pit. This causes constant run times.
Signs of failing sump pump:
Pump runs but does not eject water
Loud humming or grinding noises
Periodic tripping of circuit breaker
To fix it:
Remove and inspect pump for damage
Clean impeller and pump housing of debris
Have a technician test and repair motor
Replace defective or broken pump parts
Extend pump life with periodic maintenance like lubricating, cleaning sediment, and testing.
Troubleshooting Constantly Running Sump Pump
Follow these steps to pinpoint why your sump pump is always on:
Listen for odd noises like humming or sputtering which indicate issues.
Check float switch operation by manually lifting rod to start/stop pump.
Inspect discharge pipe for blockages, crimps, frozen sections.
Examine inlet piping for signs of leaks driving excess water into pit.
Monitor how quickly pit refills after pumping to gauge water inflow.
Determine when pump activates - during rains? frequently in dry weather?
Consider recent weather patterns - unusually wet season? snow melt?
Test pump outlet flow to estimate gallons pumped per minute.
Measure sump pit dimensions to calculate holding capacity.
Once the source of the problem is identified, undertake repairs to get your sump pump working properly again.
Preventing Constant Sump Pump Operation
You can minimize excess runtime and ensure your sump pump lasts longer by:
Routinely cleaning the sump pit of sediment
Checking discharge pipes for blockages
Replacing worn out check valves
Keeping float switches free of debris
Sealing foundation cracks limiting groundwater
Directing downspouts and grading away from foundation
Matching pump capacity to potential water volumes
Installing a backup pump system
Following manufacturer maintenance tips
Testing pump monthly and replacing every 10 years
Proper home drainage and sump pump maintenance will keep it running only as needed during wet weather. Contact a plumber right away if your pump seems to run continuously even during dry weather. Ignoring constant pumping risks burning out the motor, overflowing the sump pit, and potential water damage.
When to Call a Professional
If you've checked for common problems but your sump pump still runs nonstop, contact T&J Rooter Service at 419-474-8774 for expert troubleshooting. Our skilled technicians can pinpoint harder-to-diagnose issues like underground leaks, high water tables requiring drainage upgrades, foundation cracks, improperly sized pumps, and more.
We offer complete sump pump inspection, maintenance, repairs, and replacement in Toledo, OH and surrounding areas. Rely on our years of experience to get your sump pump working properly again. Call today to schedule affordable service and prevent expensive water