Sump Pump Failure: Warning Signs and What to Do When It Stops Working Mid-Storm

Warning signs worth checking before storm season

• Unusual noises — grinding, rattling, or a motor that sounds like it's straining
• A pump that runs constantly, even with little or no water in the pit
• A pump that doesn't turn on at all when water reaches the float switch
• Visible rust or corrosion on the pump housing or discharge pipe
• A pit that's older than 7–10 years, which is a common lifespan range for a sump pump motor

Why power outages are the hidden risk

A sump pump that works perfectly is still useless during a power outage — and storms that cause the heaviest rainfall are often the same storms most likely to knock out power. This is the single most common reason a functioning sump pump still fails to prevent a flood.

“Install check valves. Consider a sump pump with a battery.”

A battery backup system — or a water-powered backup pump, where local water pressure allows it — is the most direct fix for that specific failure point, and it's worth prioritizing if your basement has any finished space or stored belongings at risk.

If your sump pump fails during an active storm

Don't attempt electrical repairs on a pump that's sitting in water. If you have a backup pump or a wet/dry shop vacuum, use it to manage water levels manually in the short term. Move anything valuable off the basement floor immediately. Once the storm passes and it's safe, a professional can assess both the pump itself and any water damage that occurred while it was down.

Routine maintenance that prevents most failures

Test your sump pump a few times a year by pouring a bucket of water into the pit and confirming the float switch triggers it to run. Clear debris from the pit and check that the discharge line outside isn't blocked or frozen. These take a few minutes and catch the majority of failures before they happen during an actual storm.