A sump pump running constantly is hard to ignore. The motor starts, stops and starts again, sometimes for hours. In a Riverton basement, that can be the system doing its job after a hard storm. It can also be a stuck switch, a leaking valve or a discharge problem that is wearing the pump out. Here is how to tell the difference and what to check safely.
How a Sump Pump Is Supposed to Cycle
Perforated drain tile around the footings collects groundwater and carries it to a pit in the basement floor, called the sump basin. A university extension guide to sump pumps describes the same layout.
A submersible pump sits in the basin, and a float switch rides on the water. As the water rises, the float lifts and closes the switch, and the pump pushes water up the discharge pipe. As the level drops, the float falls and the pump shuts off. A check valve on the discharge pipe then closes, so the water in the pipe cannot drain back.
Every cause of a sump pump running constantly breaks one step of that loop: water keeps arriving, the switch never reaches off, water returns to the pit, or the pump spins without moving water out.
When Constant Running Is Normal
Sometimes the pump runs a lot because the ground is full of water. The Utah Geological Survey explains that heavy rain, snowmelt or surface flooding soaks down and raises the water table, which can flood basements. It urges homeowners to make sure their sump pumps work correctly.
Much of the year the soil here is fairly dry, and some pumps sit quiet for long stretches. A strong summer thunderstorm, or sprinklers soaking the ground beside the foundation, can send extra water to the pit. After that kind of soaking, a sump pump running constantly for a while can be a healthy pump keeping up.
The pit tells you which case you have. Normally, water flows in from the inlet pipe and the level drops each time the pump runs, and the cycles slow as the ground drains. If the pump runs with the pit nearly empty, or cycles through a dry week, treat it as a fault.
What Causes a Sump Pump Running Constantly
When the pattern does not match storm cycling, one of these is usually behind it. One manufacturer's installation manual lists most of them in its troubleshooting table.
- Stuck float: the float catches on the basin wall, the pipe or its own cord and never drops to off.
- Worn switch: a float can move easily and still have a failed switch that stays closed.
- Failed check valve: a flapper stuck open or leaking lets water in the pipe fall back, so the pump moves the same water repeatedly.
- Undersized pit: a small basin fills fast, and the manual notes that a larger pit allows longer pump cycles.
- Undersized pump: a pump too small for the inflow or lift height runs almost nonstop.
- Airlock or clogged intake: trapped air or debris lets the impeller spin without moving much water.
- Discharge problems: a crushed or clogged line slows the flow, and an outlet that empties beside the house lets water soak back to the drain tile.
Safe Checks You Can Do at the Pit
Many causes of a sump pump running constantly can be narrowed down in a few minutes. Work from a dry floor, and unplug the pump before your hands go near the basin.
- Watch a full cycle: note whether water flows in from the inlet pipe and whether the level drops while the pump runs.
- Listen at shutoff: a rush of water falling back into the pit right after the pump stops points to the check valve.
- Check the float: with the pump unplugged, make sure nothing pins it, then move it through its full travel.
- Look at the intake: with the power off, check the intake screen for sediment or gravel.
- Follow the discharge outside: confirm the outlet is open and water runs away from the house.
- Test with a bucket: plug the pump back in and slowly pour water into the pit. It should start as the float rises and stop as it falls.
A Riverton Scenario You Might Recognize
Picture a family in Riverton whose basement pump has been starting every minute or two for three days, though the last storm has passed and the sprinklers are off. When they lift the lid, the pit is low. The pump runs for a few seconds and stops, and a loud gurgle follows as water drops back into the basin. Then the float rises and the pump starts again.
That pattern points away from groundwater, which would show steady inflow from the inlet pipe. It points to the check valve. The same water climbs the discharge pipe and falls back on every cycle, and each start adds wear to the switch and motor until the valve is repaired or replaced.
Battery Backup and High-Water Alarms
A primary pump depends on household power, and the same summer thunderstorms that bring heavy rain can also knock the power out. A battery backup pump sits in the same pit with its own float. If the main pump fails or loses power, the backup takes over for as long as its battery lasts.
The manual recommends a backup pump and a high-water alarm wherever losing the pump could cause property damage. Ready.gov's power outage guidance also advises planning batteries and other power sources for the things in your home that rely on electricity.
A backup does not cure a sump pump running constantly, since it cannot fix a bad valve or a stuck float. Towers Plumbing can look at both through our sump pump service.
Safety Notes
- Unplug before touching: disconnect the pump before you reach into the pit, move the float or clear the intake, as both the extension guide and the manual advise.
- Stay dry: the manual warns against handling or unplugging the pump with wet hands or while standing on a wet floor.
- Keep metal out: do not use metal objects to raise the float in a pit that has power.
- Skip extension cords: the manual says they can overheat.
- Electrical danger: if you see sparks, smell burning, or water has reached the outlet, stay out of the water, get everyone outside, and call 911 from outside.
- Dry wet areas fast: the EPA mold and moisture guide says to dry water-damaged areas within 24 to 48 hours to prevent mold growth.
When to Call a Professional
Call when the pump keeps running after you have cleared the float, or when the float moves easily and the pump still will not stop. A worn switch or failing motor needs a proper diagnosis, and replacing a check valve means cutting or separating the discharge pipe. A pump that hums without moving water may be airlocked, clogged or too small.
Get help, too, if water keeps entering the pit during a long dry spell. A supply or irrigation line leaking near the foundation can feed a sump, and leak detection can help pinpoint it. A breaker that trips again and again, a hot motor, or a pit that overflows in storms also calls for a closer look.
Frequently Asked Questions
Is it normal for a sump pump to run every few minutes after rain?
For a while, yes. After a heavy storm or a long soak from irrigation, groundwater can keep flowing into the pit. It becomes a concern when no water comes in from the inlet pipe, or the pump runs with the pit nearly empty.
How can I tell if the check valve is bad?
Listen right after the pump shuts off. A rush of water falling back into the pit, followed by a quick restart, points to a valve that is stuck open or leaking. The manual lists this as a cause of a pump that cycles too often.
Can a sump pump running constantly wear out?
It can. Nonstop running and rapid on-off cycling both add wear to the motor and switch. Finding the cause early protects the pump and the basement.
Get Help With a Sump Pump Running Constantly
Before you reach out, gather a few details. Note how often the pump starts and how long each cycle lasts. Write down whether water flows in from the inlet pipe, whether you hear water falling back after shutoff, and whether it rained or the sprinklers ran recently.
A short phone video of one full cycle is useful too, and so is the pump's age if you know it. If water is rising toward the top of the pit, mention that first.
Then contact Towers Plumbing through our contact page to schedule a visit. With your notes in hand, a technician can go straight to the float, valve, pit or discharge line, confirm the cause, and explain the repair before work begins.