September 11, 2026

Why Is My Sump Pump Running Constantly? (Causes & Fixes)

Last updated October 21, 2026

Quick Answer

A sump pump running constantly is often caused by a stuck or tangled float switch, a broken check valve allowing pumped water to fall back into the pit, a high local water table after heavy rains, an undersized pump, or a clogged discharge line. Disconnect power before inspecting the float.

Is It Normal for a Sump Pump to Run Continuously?

During extreme rain events, frequent cycling is normal. However, a pump that runs for many hours without shutting off, especially when it is not raining heavily, is worth investigating. Continuous operation can cause motor overheating, breaker trips, and premature unit failure.

5 Common Reasons a Sump Pump Won't Turn Off

Inspect these common mechanical issues:

1. Stuck Float Switch: Debris or pump vibration can wedge the float against the basin wall in the "on" position.
2. Broken Check Valve: Allows evacuated water in the discharge pipe to rush back into the basin, triggering repeated restart cycles.
3. Clogged Discharge Pipe: Exterior blockages from ice, dirt, or debris prevent adequate water evacuation.
4. Undersized Pump: A smaller unit (for example, 1/3 HP) may struggle in high-inflow conditions where a higher-capacity pump is needed; correct sizing depends on inflow rate and discharge height, so ask a provider to size it.
5. High Ground Water Table: Persistent water table saturation keeping the basin filled for days after a storm.

Safe DIY Troubleshooting Steps

Unplug the pump from the GFCI outlet before touching the basin, but only if the floor around the outlet is dry. If there is standing water near the outlet, cord, or electrical panel, stay out and call a qualified electrician or professional.
Check the float arm to ensure it moves freely without scraping the basin wall.
Remove gravel, silt, or debris from the pit bottom.
Inspect the exterior discharge pipe to ensure water flows away freely.
Plug back in and test by pouring a bucket of clean water into the basin.

Still dealing with this issue? You can request a connection with an independent local plumbing provider — there is no fee to submit a request.

Request a Connection

Frequently asked questions

Will a sump pump burn out if it runs constantly?

It can. Sump pump motors are generally built for intermittent duty, and running nonstop for long periods, especially if the pump is running dry or is undersized for the inflow, can overheat the motor and shorten its life.

How long do residential sump pumps last?

Lifespan varies with pump quality, how often it runs, and maintenance. Many cost and maintenance guides cite roughly 7 to 10 years for typical submersible sump pumps.

How much does professional sump pump replacement cost?

Costs vary with pump type and horsepower, installation location, whether a battery backup is added, and local labor rates. Published cost guides show a wide range, from a few hundred dollars to a couple thousand dollars, so ask for written quotes from more than one provider.

Why won't my sump pump shut off?

Common reasons are a stuck or tangled float switch, a broken check valve that lets pumped water fall back into the pit, a clogged discharge pipe, an undersized pump, or a high ground water table. Unplug the pump before touching the basin only if the floor around the outlet is dry; if there is standing water nearby, stay out and call a qualified electrician or professional.

Is it normal for a sump pump to run continuously?

During extreme rain events, frequent cycling is normal. A pump that runs for many hours without shutting off, especially when it is not raining heavily, is worth investigating, since continuous operation can cause motor overheating, breaker trips, and premature unit failure.

Related services

PlumbRoute connects a homeowner's request with independent local providers. Requesting a connection is free and carries no obligation to hire.

Looking for sump pump in your area?

PlumbRoute is a referral service -- request a connection with an independent local plumber serving one of these areas:

Need help with this?

Request a connection with an independent local plumbing provider.

PlumbRoute is a referral service, not a plumbing contractor.

Free to Request

Request an Estimate

Tell us about your project so a local provider can follow up with pricing.

What needs attention?

Is water leaking or is your water off right now? Yes No

When was your home built?

🔒 Free to Request • 📞 Providers Contact You Directly • ✓ No Obligation

By clicking above, you consent to PlumbRoute and/or the single independent plumbing provider assigned to your request calling or texting you about this request. See Privacy & Terms.

🛡️ Please note: PlumbRoute is an independent referral service, not a plumbing contractor. Work is performed by independent providers, who are responsible for their own licensing (TSBPE in Texas, ROC in Arizona, CSLB in California), insurance, pricing, and workmanship. We recommend confirming a provider's license and insurance before work begins.

💧 Active Water Emergency? Shut Off Your Main in 3 Steps:

Locate Curb Box: Check front lawn near the street curb or inside garage side wall.
Turn Valve 90°: Rotate the brass valve perpendicular to the pipe using an adjustable wrench or meter key.
Relieve Pressure: Open an outside hose spigot or lowest sink faucet to drain residual line pressure.