UNRESTRICTED MASTER PLUMBERS

Sump Pump Running Constantly: Causes + What to Check First

Sump Pump Running Constantly: Causes + What to Check First

If your sump pump is running constantly, it’s usually happening for one of two reasons: (1) it’s doing its job because water is actively coming in, or (2) something is wrong (float switch, discharge line, check valve, or the pump is undersized/failing). Either way, a pump that never shuts off can burn out fast—and if it fails at the wrong time, you can end up with a flooded basement or crawl space.

If you want a fast, confident diagnosis, call Specialty Plumbing and Drain, LLC. You’ll be working with an Unrestricted Master Plumber and a 5-star Google-rated team that can identify the real cause and fix it the right way.

Quick answer: Is this an emergency?

Treat it as urgent if any of these are true:

  • Water is rising in the pit (the pump can’t keep up)
  • You hear the pump running, but little/no water is discharging outside
  • The pump is hot, loud, or cycling rapidly (on/off every few seconds)
  • You’ve had heavy rain, and your basement/crawl space is at risk

If you’re not sure, don’t wait for a failure. Contact Specialty Plumbing and Drain, LLC and get it checked before the pump burns out.

Why a sump pump runs constantly

1) Heavy groundwater or stormwater (the pump is actually needed)

During heavy rain or high groundwater, it’s normal for a sump pump to run frequently. But “constantly” can still mean the system is under strain.

What to check first:

  • Is water actively flowing into the pit?
  • Is the discharge line moving a steady stream of water outside?
  • Is the water level dropping in the pit when the pump runs?

If it’s running nonstop during every rain event, Specialty can evaluate whether you need a higher-capacity pump or a better drainage setup.

2) Stuck or misadjusted float switch

The float tells the pump when to turn on and off. If it’s stuck (or set too high/low), the pump may never shut off.

What to check:

  • Is the float tangled on the pump cord or rubbing the pit wall?
  • Is debris preventing the float from moving freely?
  • Does lifting the float manually change the pump behavior?

Float issues are quick to diagnose, but easy to mis-handle. If you want it fixed safely, call Specialty Plumbing and Drain, LLC.

3) Discharge line is blocked, frozen, or kinked

If water can’t leave the system, the pump can run continuously while accomplishing very little.

What to check:

  • Look for visible kinks in the discharge pipe
  • In cold weather, check for a frozen section near the exit point
  • Listen for a “straining” sound with poor flow outside

If you suspect a blocked discharge, stop guessing—Specialty can clear the line and confirm proper flow.

4) Failed or missing check valve (water is falling back into the pit)

A check valve prevents discharged water from flowing back into the sump pit. If it fails, water returns and triggers the pump again—leading to nonstop cycling.

Signs this is the issue:

  • You hear water rushing back into the pit after the pump shuts off
  • The pump turns on again quickly after stopping

A check valve replacement is a small fix that can prevent a big failure. Specialty can inspect and replace it if needed.

5) Undersized pump or wrong pump type

If the pump can’t keep up with inflow, it may run continuously and still struggle.

Common reasons:

  • The home has higher-than-expected groundwater
  • The pump horsepower/capacity is too low
  • The discharge run is long or has too much vertical lift

Specialty Plumbing and Drain, LLC can size the system correctly so you’re not replacing pumps every season.

6) Worn-out pump (impeller wear, motor fatigue)

Pumps don’t last forever. A worn impeller or tired motor can reduce output, causing longer run times. The signs are:

  • The pump sounds louder than normal
  • It runs, but the water level drops slowly
  • It’s older and has been running hard during storms

If your pump is aging or struggling, schedule an inspection with Specialty and get ahead of a failure.

What to check first (safe homeowner checklist)

Look at the water level in the pit: is it dropping when the pump runs?
Check the float: make sure it moves freely and isn’t stuck.
Confirm discharge outside: is water actually coming out?
Listen for backflow: do you hear water dumping back into the pit?
Check the power: ensure it’s plugged into a proper outlet (not a loose extension cord).

If anything looks off—or you want a pro to confirm the diagnosis—contact Specialty Plumbing and Drain, LLC. You’ll get clear answers from an Unrestricted Master Plumber and a 5-star team.

What NOT to do

  • Don’t unplug it and “wait and see” if water is rising
  • Don’t reach into the pit with the unit powered
  • Don’t ignore rapid cycling (it can burn out the motor)
  • Don’t rely on chemical cleaners or DIY “flushes” for a discharge issue

If you’re worried about flooding, call Specialty now and get it handled before it becomes an emergency.

Sump Pump Repair and Installation Experts

If your sump pump won’t shut off, don’t wait for it to burn out—or for water to start rising. Contact Specialty Plumbing and Drain, LLC for fast help with sump pumps, drains, leaks, and emergency plumbing. You’ll be working with an Unrestricted Master Plumber and a 5-star Google-rated team that homeowners trust to show up, diagnose issues accurately, and fix them right so that you can protect your home and get back to normal.

Contact Us

5 Star Reviews

  • Chad D

    Sean was amazing! I had an emergency situation and they rushed out on a Saturday. [...]

About Us

Our Blog

View Video

All Services