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Sump Pump Failure Signs and Battery Backup Systems
Twice-a-year testing, warning signs and backups that work when the power goes out.
The sump pump sits quietly in the basement until the one night it really matters: spring thaw, a heavy rain, a power cut. If it fails then, the basement floods.
A few minutes of checking twice a year, and a backup, cover most of the risk.
Warning signs
- It runs constantly, even in dry weather
- It cycles on and off quickly
- Grinding, rattling or humming without pumping
- The float sticks or gets caught on the pit wall
- Rust, or water standing in the pit after it should have emptied
How to test it
Slowly pour a bucket of water into the pit. The float should rise, the pump should start, empty the pit and shut off. Go outside and check that water comes out of the discharge line.
Clean debris from the pit and check the check valve for leaks or backflow.
Battery backup options
A battery backup pump sits alongside the main pump and takes over if power fails or the main pump stops. Water-powered backups, which use municipal water pressure, are another option where allowed.
A plumber or waterproofing contractor can size a backup and add a high-water alarm so you know when something's wrong.
Protect the discharge line in winter
If the outdoor discharge pipe freezes, the pump can't empty the pit. Make sure it slopes away and drains, and keep its outlet clear of snow and ice.
Common questions
It depends on use and quality. Replace one that shows warning signs instead of waiting for it to fail.
Many municipalities prohibit it. Check your city's bylaws.
Some flood-prevention programs cover sump pumps. See our backwater valve and subsidies guide.