How often should you replace a sump pump?
Updated July 2026
Swap out a sump pump every 7 to 10 years on a schedule, whether or not it still hums when you pour in a bucket of water. Sump pumps fail without warning, and they fail during the exact storm you bought them for. A new primary pump runs $150 to 400 in parts; a basement flood from a dead one averages $10,000 to 40,000 in ruined drywall, flooring, and belongings. The math makes proactive replacement one of the easiest calls in the house.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Primary pump, 7–10 years old | Replace on schedule | Motor and switch failures spike at that age |
| Runs constantly (high water table) | Every 5–7 years | Heavy duty cycles wear the motor years faster |
| Rarely runs | Every 7–10 years | Seals and bearings still age even when idle |
| No battery backup installed | Add one now | Floods and power outages arrive in the same storm |
| Stuck float or grinding motor | Replace now | A seized switch will not start when it counts |
| Finished basement below grade | Replace at 7 years | One miss costs far more than the pump |
The cost of skipping it
What skipping it costs: a sump pump that dies mid-storm turns a finished basement into a claim. Water restoration alone starts around $3,000 to 7,000, and a full gut of soaked drywall, flooring, and belongings pushes the total to $10,000 to 40,000. Insurance often excludes groundwater backup unless you carry a rider. A $150 to 400 pump every 7 to 10 years, plus a battery backup, is the cheapest flood insurance you can buy.
How to do it (1–2 hours · Moderate DIY, or $250–500 pro)
- Test the pump first: pour a five-gallon bucket of water into the pit and confirm the float rises and the pump ejects it.
- Unplug the old pump and disconnect it from the discharge pipe at the union fitting.
- Lift the pump out, clear any gravel or sludge from the pit, and check the check valve for free movement.
- Set the new pump on a flat brick or stand so the intake sits above pit silt, and connect the discharge and check valve.
- Confirm the float can swing without hitting the pit wall, then plug it in and run a bucket test again.
- While you are down there, verify the battery backup and its alarm work, since the two fail as a pair in a real storm.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing sump pump replacements schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
How do I know if my sump pump is going bad?
Watch for a pump that runs constantly or cycles on and off rapidly, strange grinding or rattling noises, visible rust, a float that sticks, or a unit that vibrates hard when it kicks on. Motor age matters even without symptoms: past 7 years, reliability drops fast. The surest test is to pour a bucket of water into the pit every few months and confirm it starts, pumps, and shuts off cleanly. If it hesitates, replace it before storm season.
Do I need a battery backup sump pump?
If your basement is finished or you get real groundwater, yes. The catch with sump pumps is timing: the storms that overwhelm the pit are the same storms that knock out the power, so a primary pump alone leaves you exposed at the worst moment. A battery backup or water-powered backup keeps pumping through an outage. Budget $150 to 500 for the backup unit and plan to replace the battery every 3 to 5 years.
Can I replace a sump pump myself?
It is a moderate DIY job if you are comfortable with basic plumbing: disconnect the discharge union, lift out the old pump, set the new one level in a clean pit, and reconnect. Budget one to two hours and $150 to 400 for the pump. Hire a plumber ($250 to 500 total) if the discharge is hard-piped, the pit is cramped, or you want the check valve and backup system checked at the same time.