How long does a sump pump last?
Updated August 2026
A sump pump lasts 7 to 10 years, one of the shorter lifespans in the basement, because it spends its life sitting in water and switching on and off. A submersible pump, the type that sits down in the pit, lands at 7 to 10; a pedestal pump keeps its motor up in the dry air and often reaches 10 to 15. How hard yours works matters most. A pump fighting a high water table that cycles constantly wears out years sooner than one that runs a few times a month, and the float switch, the part that tells it when to turn on, usually gives out before the motor does.
Lifespan by type and situation
| Type or situation | Typical lifespan | Why |
|---|---|---|
| Submersible sump pump | 7–10 years | Sits in the water; convenient, but the motor works while flooded |
| Pedestal sump pump | 10–15 years | Motor stays above the pit and dry, so it usually outlasts submersibles |
| Battery backup pump | 5–7 years | A secondary unit for outages; runs only in emergencies |
| Backup battery itself | 3–5 years | The real weak link; test it and swap on schedule |
| Runs constantly (high water table) | Cut 2–4 years | More cycles mean more heat and faster switch and bearing wear |
| Float switch | First to fail | Often dies before the motor; frequently a cheap standalone fix |
| Tested each season, pit kept clear | Top of the range | A debris-free pit and free-moving float add years |
Signs yours is near the end
- It runs nonstop or short-cycles, clicking on and off every few seconds even when little water is coming in
- Grinding, rattling, or a loud hum from the motor that was not there before
- It vibrates hard or the housing has visible rust, both signs the bearings or impeller are worn
- You pour a bucket of water into the pit and the float does not lift the switch to start the pump
- Water in the pit rises higher than it used to before the pump kicks in, or it never fully empties
- The unit is 7 or more years old, which alone is reason to replace it before storm season
How to add years
A sump pump is only as good as its last test, so every season pour a bucket of water into the pit and confirm the pump kicks on, empties it, and shuts off. Clearing the pit of gravel and silt keeps the float moving freely, since a stuck float is the most common no-start of all. Because a dead pump during a storm means a flooded basement, add a battery backup and replace that battery on schedule, as power tends to fail in the exact storm you need the pump. Given how cheap the unit is against a flood, most pros simply swap the pump proactively around year 7 rather than gamble on the next heavy rain. A seasonal checklist keeps it honest.
What it costs to replace: plan on $400–900 installed. Replacing on your own schedule, before it fails, is almost always cheaper than the emergency version. The home maintenance cost calculator helps you set the money aside before it comes due.
OnOtto tracks your sump pump tests age and service history, and warns you before end of life instead of after the flood.
Track your home's systems, free for 30 daysFrequently asked questions
How often should I test my sump pump?
At least twice a year, and ideally every season, plus once more right before the wet months arrive. Testing is simple: slowly pour a five-gallon bucket of water into the pit until the float rises, then watch the pump switch on, pump the pit down, and shut off cleanly. While you are there, confirm the discharge line outside is clear and draining away from the foundation, and that the float is not hung up on the pit wall. Two minutes of testing is what stands between you and finding a dead pump only after the basement floods.
Do I really need a battery backup sump pump?
If a flooded basement would cost you real money, yes. The cruel irony of sump pumps is that the storms most likely to overwhelm your pit are the same storms that knock out the power, leaving the main pump dead exactly when you need it most. A battery backup unit kicks in automatically during an outage and buys hours of protection. Budget $150 to $400 for the pump and battery, and remember the battery itself only lasts 3 to 5 years, so test it and replace it on schedule or it will fail silently.
Why does my sump pump run constantly?
A few causes. Most benign is a genuinely high water table or heavy rain, where the pump is simply keeping up. But constant running also comes from a float switch stuck in the on position, a check valve that lets pumped water flow back into the pit so it cycles endlessly, a pump undersized for the volume, or a discharge line that is clogged or frozen. Constant running burns out the motor fast, so if it will not stop even when things are dry, check the float and check valve first, then consider whether the unit is simply worn out.
Should I replace my sump pump before it fails?
Usually, yes, and this is one appliance where proactive replacement pays. A sump pump costs $400 to 900 installed, while a single basement flood from a pump that quit can run into the thousands in water damage, mold remediation, and ruined belongings. Because these pumps give out at 7 to 10 years and often with little warning, many homeowners simply swap the pump around year 7, keep the old one as a spare, and sleep easier through storm season. At minimum, if yours is past 7 and making new noises, do not wait for it to fail.