The short answer
Sump pumps wear out quietly. Many insurers and installers suggest planning replacement after roughly 5 to 10 years, sooner for a pump that runs often. Watch for the warning signs below and test the pump before the wet season.
Warning signs
- Runs constantly or cycles every few seconds.
- Hums but doesn't pump (possible jammed impeller or air lock).
- Loud grinding or rattling.
- Visible rust, a damaged float or a cord with cracked insulation.
- Water left high in the pit after the pump stops.
How to test
Pour water into the pit until the float lifts. The pump should start, empty the pit to the off level and stop cleanly. Check that water leaves the discharge outside.
SafetyUnplug the pump before reaching into the pit or clearing the intake.
Replace and protect
When replacing, consider adding a backup or alarm. A high-water alarm is cheap; a combo system replaces the primary and adds a backup at once.
Products mentioned
Questions readers ask
How long do sump pumps last?
Often 5 to 10 years, depending on how often they run and water conditions.
Why does my sump pump hum but not pump?
Often an air lock, a jammed impeller or a stuck check valve.