To check if your sump pump works, pour a bucket of water into the sump pit and watch for the pump to turn on automatically and drain the water. If it doesn't activate, your sump pump may be faulty or the float switch could be stuck. This guide from MyTownPlumber walks you through the complete testing process, common issues, and maintenance tips to keep your basement dry in 2026.
Why Testing Your Sump Pump Matters
A sump pump is your first line of defense against basement flooding, especially during heavy rains or spring thaw. According to the EPA WaterSense, water damage can be costly, and prevention is key. A non-functioning sump pump can lead to structural damage, mold growth, and ruined belongings. Regular testing ensures your pump is ready when you need it most.
Before You Start: Safety First
Always unplug the pump before reaching into the pit. Wear rubber boots and gloves to protect against electrical shock. Ensure the area is dry and well-lit. If your pump is hardwired, turn off the circuit breaker at the main panel.
Tools You'll Need
- Bucket or garden hose
- Clean water (at least 5 gallons)
- Screwdriver (for accessing the pump)
- Multimeter (if you suspect electrical issues)
- Flashlight
Step-by-Step: How to Check if Sump Pump Works
Step 1: Visual Inspection
Check the power cord for fraying or damage. Ensure the cord is plugged into a grounded outlet. Look for visible rust or corrosion on the pump and float switch. If the pump is in a pit, remove any debris like rocks or silt that could clog the intake.
Step 2: Test the Float Switch
The float switch activates the pump when water rises. Manually lift the float arm or press the switch (depending on your model). You should hear the pump turn on. If not, the switch may be stuck or the motor may be dead.
Step 3: Perform the Water Test
Fill a bucket with water and slowly pour it into the sump pit. The float should rise and trigger the pump. Watch the pump discharge water through the outlet pipe outside. The pump should run until the water level drops, then shut off automatically. If the pump doesn't turn on, or if it runs continuously, there's a problem.
Step 4: Check the Discharge Pipe
While the pump is running, inspect the discharge pipe outside. Water should flow freely and exit at least 10 feet away from your foundation. If the pipe is blocked or frozen, water will back up into the pit, causing the pump to run longer or fail.
Step 5: Test the Backup System (if applicable)
If you have a battery backup sump pump, test it separately. Unplug the primary pump, then pour water into the pit. The backup should activate and pump out the water. Recharge the battery after testing.
What to Do If Your Sump Pump Doesn't Work
If your pump fails the water test, try these troubleshooting steps:
- Check the power: Make sure the outlet works by plugging in another device. Test the circuit breaker.
- Clean the float switch: Remove any debris or mineral buildup that might restrict movement.
- Inspect the impeller: Unplug the pump, remove it from the pit, and clean the impeller (the fan-like part) of debris.
- Look for clogs: Check the discharge pipe for blockages, especially at the check valve.
If these steps don't solve the issue, you may need professional repair or replacement. Our sump pump services can help diagnose and fix the problem efficiently.
Common Sump Pump Problems and Solutions
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump doesn't turn on | Power failure, stuck float, or motor failure | Check power, free the float, or replace the pump |
| Pump runs continuously | Float switch stuck on, high water table, or wrong pump size | Adjust the float, install a bigger pump, or check groundwater level |
| Pump runs but doesn't discharge water | Clogged impeller, blocked discharge pipe, or frozen pipe | Clean the impeller, clear the pipe, or thaw the pipe |
| Pump makes loud noises | Worn bearings, debris in the impeller, or cavitation | Clean the pump, replace bearings, or call a professional |
| Pump trips the circuit breaker | Electrical short, overloaded circuit, or faulty motor | Replace the pump or have an electrician inspect |
Maintenance Tips to Keep Your Sump Pump Working
Regular maintenance extends the life of your sump pump and prevents failures. Follow these tips:
- Test monthly: Repeat the water test every month, especially before rainy seasons.
- Clean the pit: Remove debris and silt from the pit every few months.
- Inspect the discharge line: Ensure it's clear and free of kinks or blockages.
- Check the battery backup: If you have one, test it monthly and replace the battery every 2-3 years.
- Schedule professional maintenance: Have a plumber inspect your sump pump annually.
According to the U.S. Department of Energy, proper maintenance of water systems can save energy and prevent costly repairs. While that page focuses on water heating, the principle applies to sump pumps too.
When to Call a Professional
If you're not comfortable testing or repairing your sump pump, or if it fails repeatedly, it's time to call a licensed plumber. Persistent issues may indicate a deeper problem like a high water table, improper pump sizing, or a failed check valve. Our team at MyTownPlumber can provide expert diagnosis and repair. We also offer related services like drain cleaning, water heater repair, and leak detection to keep your home safe and dry.
Frequently Asked Questions
How often should I test my sump pump?
Test your sump pump at least once a month, and always before a heavy rainstorm. Seasonal checks are also recommended, especially after winter when the pump may not have run for months.
Can I test my sump pump without water?
Yes, you can manually lift the float switch to see if the pump turns on. However, a water test is more accurate because it simulates real conditions and checks the float's operation.
Why does my sump pump run but not drain water?
This usually indicates a clogged impeller, a blocked discharge pipe, or a stuck check valve. Unplug the pump, clean the impeller, and inspect the discharge line for obstructions.
What size sump pump do I need?
The size depends on the volume of water entering your pit and the height it must be pumped. A typical residential sump pump can handle 1/3 to 1 HP. Consult a professional for sizing.
How long does a sump pump last?
The average lifespan is 7 to 10 years, but regular maintenance can extend it. If your pump is older and fails tests, consider replacing it proactively.
Can a sump pump run on battery backup?
Many sump pumps have battery backup systems that activate during power outages. Test the backup monthly and replace the battery every 2-3 years.
Conclusion and Next Steps
Knowing how to check if your sump pump works is a simple yet essential skill for any homeowner. By following the steps in this guide, you can catch problems early and avoid costly water damage. If you find issues you can't fix, or if you need a new sump pump installed, the MyTownPlumber team is here to help. We also offer pipe repair and sewer line repair services to address any related drainage issues. For a limited time, take advantage of our plumbing offer and save on your next service. Don't wait until the next storm—test your sump pump today and protect your home.
By MyTownPlumber Editorial Team