Sump Pump Running Constantly? Causes and What to Do

A sump pump that runs all the time is stressful, and it shortens the pump's life. Sometimes it is simply doing its job during a wet spell or the spring thaw. Other times something is wrong with the switch, check valve, pump sizing or discharge.

Quick diagnosis checklist

  1. Is it raining or thawing?. During heavy rain or snowmelt, frequent cycling can be normal when the water table is high. Watch whether it settles down a day or two after the weather.
  2. Check valve. If water flows back into the pit after each cycle, the check valve on the discharge pipe may have failed, making the pump re-pump the same water.
  3. Float switch. A float stuck in the 'on' position, or tangled with the cord, can keep the pump running even when the pit is empty.
  4. Discharge recirculating. If the discharge empties near the house, the water can soak back down to the drain tile. Route it well away.
  5. Frozen or blocked discharge. In winter, a frozen discharge line can make the pump run without moving water. This can burn out the motor.
  6. Pump too small or failing. An undersized or worn pump may not keep up and run continuously.

DIY or call a pro?

Unplug and replug the pump, clear debris around the float, and check where the discharge ends up. Call a plumber or waterproofing contractor if the pump runs with an empty pit, hums without pumping, cycles nonstop in dry weather, or if you need a backup system.

Frequently asked questions

Can a sump pump run 24/7?

Not for long without wearing out. Investigate if it runs continuously outside of storms.

Should I add a second pump?

Wet basements sometimes benefit from a primary plus backup pump. A pro can size it.

What if the power goes out?

Battery or water-powered backups keep pumping during outages.

Who to call

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