If your sump pump has stopped working — or you walked downstairs to find water creeping across the floor — you need answers fast. A sump pump is one of those things most homeowners never think about until it fails, and by then the damage can add up quickly.
Here’s what’s probably going on and what you can do about it.
How a Sump Pump Works (Quick Refresher)
A sump pump sits inside a pit (called a sump basin) at the lowest point of your basement or crawlspace. When groundwater or rainwater collects in the pit, a float switch triggers the pump to turn on and push the water out through a discharge line away from your foundation.
It’s a simple system, but every part of it has to work correctly. If the power cuts out, the float gets stuck, or the discharge line clogs, water has nowhere to go — and your basement pays the price.
Why Your Sump Pump Stopped Working
Power Issues
This is the most overlooked cause. Sump pumps run on electricity, and if the breaker tripped, the plug came loose, or a storm knocked out power, the pump is dead in the water (literally). It’s also common for someone to unplug the pump temporarily and forget to plug it back in.
Stuck or Failed Float Switch
The float switch tells the pump when to kick on. If it gets jammed against the side of the pit, tangled on the power cord, or simply wears out, the pump won’t activate even when water is rising. This is the single most common mechanical failure in sump pumps.
Clogged or Frozen Discharge Line
The discharge line carries water from the pump to the outside of your home. If that line gets clogged with debris, dirt, or ice during cold snaps, water backs up into the pit and overflows. Check where the line exits your house — if it terminates too close to the foundation, that’s another problem waiting to happen.
Burned-Out Motor
Sump pump motors don’t last forever. If your pump has been running for years — especially if it cycles frequently or has ever run dry — the motor may have simply burned out. Most sump pumps last about seven to ten years with normal use.
Check Valve Problems
A check valve on the discharge line prevents water from flowing back into the pit after the pump shuts off. If the valve fails or was never installed, water drains back down, the float rises again, and the pump cycles over and over. That constant cycling burns out the motor faster.
Overwhelmed Pump
Sometimes the pump is working fine — it’s just not powerful enough. If your area gets heavy rainfall or you have a high water table, a small pump may not be able to keep up. You’ll notice the pump running nonstop but the water level barely dropping.
What to Do Right Now
If your sump pump isn’t working, run through these steps before calling anyone:
- Check the power. Is it plugged in? Has the breaker tripped? Reset it and see if the pump turns on.
- Test the float switch. Reach into the pit (with the power off first) and make sure the float moves freely. If it’s stuck, reposition it.
- Listen for humming. If the motor hums but the pump doesn’t move water, something is jammed or the impeller is stuck. Turn the pump off immediately to avoid burning out the motor.
- Inspect the discharge line. Go outside and check the end of the line. If water isn’t flowing out when the pump runs, the line may be blocked.
- Pour water into the pit. If you’re not sure the pump is working, slowly pour a bucket of water into the basin. The float should rise and trigger the pump.
If your basement is actively flooding, your first priority is keeping people and valuables safe. Don’t stand in standing water near electrical outlets. Check out these emergency plumbing quick fixes for steps you can take while you wait for help.
When to Call a Plumber
Some sump pump problems are easy DIY fixes — a tripped breaker, a stuck float switch, a clogged discharge line. But if you’re dealing with any of these, it’s time to call a professional:
- The motor is burned out and the pump won’t run at all
- The pump cycles constantly even when there’s no heavy rain
- Your basement is flooding and you can’t stop it
- The pump is more than seven to ten years old and has started acting unreliable
- You hear the pump running but water isn’t leaving the pit
A failed sump pump during a storm can cause serious water damage in a matter of hours. If you’re not sure what counts as a plumbing emergency, basement flooding definitely qualifies. A 24-hour emergency plumber can assess the situation and get your pump replaced or repaired before the damage spreads.
How to Prevent Sump Pump Failures
You don’t want to find out your sump pump is broken during the worst possible moment. A few simple steps keep it reliable:
- Test it every few months. Pour water into the pit and confirm it pumps out.
- Clean the pit annually. Remove debris, gravel, and sediment that can clog the intake.
- Check the discharge line before rainy season. Make sure it’s clear and draining away from your foundation.
- Consider a battery backup. A backup sump pump keeps working during power outages — which is exactly when you need it most.
- Replace aging pumps proactively. If your pump is approaching ten years, don’t wait for it to fail.
Keeping your water line systems in good shape and knowing how to find hidden water leaks are also part of protecting your home from water damage.
Don’t Wait Until It Floods
A working sump pump is your basement’s last line of defense against water damage. If yours has stopped working, isn’t keeping up, or you’re just not sure it’ll hold up through the next big rain — get it checked now.
If you need help with your sump pump or want a professional assessment, call Western Rooter & Plumbing at (626) 448-6455 or schedule service online through our website.
