How often should you test your sump pump?

Why bother

The day you need it is a bad day to find it dead. This is an essentials-tier job. Skip it and you're inviting the expensive kind of problem, or the dangerous kind.

What the job involves

1. Pour a 5-gallon bucket of water slowly into the pit until the float rises. The pump should kick on, drain the pit fast, then shut itself off when the water drops. That whole cycle is the test.
2. Watch and listen while it runs. The float should swing free, not snag on the basin wall, the motor should run smooth with no grinding or rattle, and the pit should actually empty.
3. Step outside and find where the discharge pipe lets out. Water should be pushing through it and running well clear of the foundation, not backing up against ice, leaves, or muck.
4. Scoop the grit out of the pit and clear the inlet screen. If you've got a backup battery, confirm it still holds a charge before you walk away.

Do it yourself, or pay someone?

Yourself for the routine test: a bucket of water, a few minutes, no tools, every three or four months and a fuller check before spring. Call a pro if it fails the test, runs nonstop, grinds, or is past seven to ten years old. Replacement runs about $309 to $755; adding a battery backup runs about $600 to $2,000 installed.

What skipping it costs

$2,000 to $7,000 is what a flooded-basement cleanup runs once a dead pump lets the pit overflow: pumping the water out, drying everything, sanitizing what's left. National average lands around $4,000, and most jobs sit in that band. Severe or dirty-water floods can top $12,000. The sting is the insurance: standard homeowners policies usually exclude sump-pump-failure water damage unless you carry a water-backup rider, so the bill is often yours. A bucket of water tells you the pump still works before the storm does.

Signs it's overdue

• The pump runs constantly, or clicks on and off when the pit is nearly empty. That points to a stuck float or a faulty check valve, and it will burn the motor out early.
• Grinding, rattling, or whining from the motor, or rust creeping over the unit. Worn bearings, a chewed-up impeller, or a pump near the end of its years.
• Damp patches, peeling paint, or a musty smell down by the basement floor. The pump isn't clearing the water fast enough, or it isn't clearing it at all.

When to start thinking about it

A few days' warning does it. Grumpty grumbles 3 days out, then leaves you alone. Mark it done and Grumpty sets the next one, every 6 months, so you can go back to forgetting it exists.

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