Around seven to ten years for a pump that runs occasionally, and considerably less for one that runs continuously through a wet season. Duty cycle is what decides it, not age. The pump that fails is almost always the one nobody has tested since it was installed.
How hard a pump works here
The middle home in Syracuse was built in 2005 and up to 100% of the mapped ground here is rated as susceptible to ponding. Newer housing means many pumps in this city are still on their first, which is exactly when nobody tests them. Ground that holds surface water is also ground where a discharge line that stops short recirculates, and a pump lifting the same water repeatedly reaches the end of its range early for a reason that has nothing to do with the pump.
The reasoning behind that
A sump pump is a motor, a switch and an impeller. The switch usually goes first, and a switch that has stopped working looks identical to a pump that has nothing to do.
Duty cycle is the variable. A pump cycling a few times after a storm will outlast a pump running most of the day for six weeks every spring by years. Where a pump runs hard seasonally, plan on the shorter end of the range.
Testing takes two minutes: pour a bucket of water into the pit and watch it start, run and stop. Do it before the wet season rather than during it.
Two things extend the life meaningfully. A pit lid keeps debris out of the impeller. A check valve stops the column of water in the discharge line falling back into the pit and making the pump lift the same water twice on every cycle.
A battery backup is not about lifespan. It is about the storm that causes the power cut.
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