How often should you test your sump pump?
Updated July 2026
Test your sump pump every 3 to 4 months — and never skip the test that matters most, right before your wet season (spring snowmelt in the north, fall/winter rains on the coasts). The test is a bucket of water and two minutes. Sump pumps fail silently: they sit idle for months, then the one night they're needed, a stuck float or dead motor turns a rainstorm into a flooded basement. Plan on replacing the pump itself at about 10 years.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Finished basement or stored valuables below grade | Every 3 months + before wet season | The downside is measured in five figures, not inconvenience |
| Pump runs regularly (high water table) | Quarterly test, annual clean | Working pumps wear faster — check the impeller and pit yearly |
| Pump rarely runs (dry climate) | Every 3–4 months | Idle pumps seize and floats stick — disuse is its own failure mode |
| Battery-backup unit installed | Test backup with primary unplugged, quarterly | The backup exists for power outages — test it the way it will be used |
| Pump age 7–10+ years | Test quarterly, budget replacement | Average service life is ~10 years; $150–400 for the unit |
The cost of skipping it
What skipping it costs: water damage claims from basement flooding commonly run $2,000–10,000+ once flooring, drywall, and belongings are counted — and standard homeowners insurance often excludes groundwater flooding unless you carry a specific sump-failure rider. The pump that prevents it costs $150–400, and the test that catches it dying costs a bucket of water.
How to do it (10 minutes · DIY with a bucket of water)
- Open the sump pit lid and check the pit: clear out debris, gravel, or anything near the float.
- Pour in a bucket or two of water (enough to raise the float) and watch: the pump should kick on promptly, drain the pit, and shut off without the float sticking.
- Go outside and confirm water actually discharged away from the foundation, and that the line isn’t clogged, frozen, or dumping beside the wall.
- Check the check valve (the vertical pipe fitting): water shouldn’t rush back into the pit when the pump stops.
- If you have battery backup: unplug the primary and repeat the bucket test; note the battery’s age (replace ~every 3–5 years).
Knowing the interval is the easy half. OnOtto reminds you at the right interval — and won't let you snooze it into next year. Tasks persist until they're done, and completing the quarterly pump test schedules the next one automatically.
Put this on autopilot — free for 30 daysFrequently asked questions
What are the signs a sump pump is about to fail?
Rattling or grinding (impeller trouble), a hum with no pumping (dead motor or stuck impeller), short-cycling on/off (float or check-valve issues), rust and visible corrosion, or simply age past 7–10 years. Any of these before wet season: replace proactively — a $150–400 pump is the cheapest flood insurance sold.
Do I need a battery backup sump pump?
If your basement is finished or your area loses power in exactly the storms that flood — yes. The primary pump's fatal flaw is needing electricity during weather that takes electricity down. A battery backup ($150–500 plus battery) or a water-powered backup (needs municipal pressure) covers the outage case; test it quarterly with the primary unplugged.
My sump pit is always dry. Can I ignore the pump?
Test it anyway — quarterly. A dry pit means the pump is idle, and idle pumps seize, floats stick, and seals dry out. The dry years are also exactly when you forget it exists; the hundred-year storm doesn't check your pit's history first.