The short answer
Power Outages Stop the Pump
When a storm knocks out electricity, your sump pump has no power to run. Most pumps rely on household current, so a blackout leaves the pit to fill on its own. If you have a battery backup or a water-powered backup, that can keep things moving until power returns.
Without a backup, even a short outage can allow water to rise above the pit and spread across the floor. The longer the outage lasts, the more water your home takes in. Consider testing your backup system before the next storm season.
A Stuck Float Switch Leaves the Pump Silent
The float switch tells the pump when to turn on. If it gets stuck, the pump may not activate even when the pit is full. Debris, a tangled cord, or a misaligned float can all cause this problem. Check the float by lifting it gently to see if the pump starts.
A stuck switch often happens after a long dry period when the pit sits empty. Sediment or rust can build up on the mechanism. A quick test before a storm can save you from a wet crawlspace.
- Lift the float by hand to test the pump
- Clear any debris around the float arm
- Make sure the float moves freely up and down
- Check that the pump is plugged in
- Look for corrosion on the switch contacts
The Pump Is Overwhelmed by Heavy Rain
During a heavy downpour, water can pour into the sump pit faster than the pump can remove it. If the pump is too small for the volume of water, it runs constantly but cannot keep up. The pit overflows, and water ends up on your floor.
A pump that runs nonstop also wears out quickly. The motor can overheat and shut down, leaving you with no pumping at all. If this happens often, a larger pump or a second pump might be needed.
A Clogged Discharge Line Blocks the Flow
The discharge pipe carries water away from your home. If it becomes clogged with mud, leaves, or debris, the pump works but water cannot escape. The pump may run but push water back into the pit, causing it to cycle on and off rapidly.
Check the outside end of the discharge line for blockages before a storm. Make sure the pipe is clear and that the check valve is working. A blocked line can also cause the pump to burn out.
- Inspect the outside opening for debris
- Flush the line with a garden hose if possible
- Listen for a gurgling sound that indicates a partial block
- Make sure the check valve opens properly
- Clear any ice from the pipe in cold weather
What to Do After a Pump Failure
If your sump pump failed and water got into your home, act quickly to remove standing water and dry the area. Use a wet vacuum or mop to get up as much as you can, and move furniture and rugs to a dry spot. Open windows and use fans to promote air circulation.
For significant flooding, local water damage pros can help with extraction and drying. They have equipment to handle large volumes of water and to dry walls and floors thoroughly. Call your insurance company to ask about coverage for the damage. Policies vary, and your insurer decides what is covered.
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Call Now (386) 272-5697Frequently asked questions
How can I test my sump pump before a storm?
Pour a bucket of water into the sump pit slowly. The pump should turn on automatically and drain the water. If it does not, check the power cord, the float switch, and the outlet. Test the backup battery as well if you have one.
Can a sump pump fail without power?
Yes, a power outage is the most common cause of sump pump failure during a storm. Without electricity, the pump cannot run. A battery backup or a water-powered backup can keep the pump working during an outage, but these systems also need regular testing.
Should I replace my sump pump after it fails?
Not always. Sometimes a simple fix like clearing a clog or adjusting the float solves the problem. But if the pump is old, has a burned-out motor, or has failed multiple times, replacement may be a better choice. A professional can inspect and advise.