How to test a sump pump
Five minutes, four times a year. The half of the test most people skip is confirming that the pump stops.
A sump pump spends most of its life doing nothing, which makes it the ideal appliance to fail silently. A quarterly test takes five minutes and catches most failures while the weather is fine and the stores are open.
The test
- Look before you pourLift the lid. Check the pit for debris, check the float is clear of the wall and the pipe, and check the pump is sitting level.
- Pour five gallons in slowlyA bucket at a time, into the pit rather than onto the pump. Slowly, so you can watch the float rise through its travel.
- Confirm it startsThe pump should switch on before the water reaches the pit rim, with a comfortable margin.
- Confirm it STOPSThis is the half people skip. A pump that will not shut off runs dry and destroys itself, and that is a worse failure than one that will not start.
- Confirm it does not immediately restartA restart within a few seconds means the check valve is letting water fall back. See sump pump keeps running.
- Go outside and look at the dischargeWater should be leaving the pipe and running away from the house. No flow, with the pump running, means a blockage.
While you are down there
- Test the backup, if you have one. Unplug the primary and pour in another bucket; the backup should take over.
- Check the battery indicator on the backup controller. Most will report a failing battery long before it dies completely.
- Wet the water alarm contacts and confirm it sounds, and that any phone notification actually arrives.
- Listen. Grinding or screeching that was not there last time is worth investigating now rather than in March.
Basement Watchdog water alarm
A floor alarm covers the three months between tests, for the price of a sandwich.
#ad we earn a commission · Amazon shows the current price
| Type | Standalone basement water alarm with a floor sensor |
|---|---|
| Use | Sits beside the pit, not in it, so it only sounds when the pit has already lost |
Testing quarterly is good practice. An alarm covers the other eighty-nine days.
What it gets right
- No network needed
- Nothing to configure
- Cheap enough to buy several
Where it falls short
- Local only
- Alerts after water arrives
Specifications from Amazon listing (search).
PumpSpy sump pump monitor
A monitor watching cycles tells you about a failure days before a quarterly test would.
#ad we earn a commission · Amazon shows the current price
| Type | Wi-Fi sump pump monitor with its own high-water float |
|---|---|
| What it watches | Pump power, pump cycles and pit water level |
| Alerts | Push and email when the pump stops cycling or the level climbs |
The closest thing to testing the pump every day without going down there.
What it gets right
- Watches power, cycles and level
- Own high-water float
- Retrofits to any pump
Where it falls short
- Needs basement Wi-Fi
- Cloud-dependent for remote alerts
Specifications from Amazon listing (search).
When to test
| When | What |
|---|---|
| Every three months | The bucket test, both halves |
| Before the spring thaw | Full test plus the discharge line outside |
| Before hurricane or heavy-rain season | Full test plus backup battery check |
| After any power outage | Confirm the backup recharged and the primary restarted |
| Annually | Lift the pump, clean the pit and the intake |
Questions people ask
How often should I test my sump pump?
Quarterly, plus before any season you expect heavy rain. Five minutes with a bucket catches most failures while they are still cheap.
How much water should I pour in?
Enough to raise the level to the switch-on point, typically around five gallons in a standard pit. Pour slowly so you can watch the float travel.
Should I test by lifting the float?
That tests the switch only. Using water tests the switch, the pump, the check valve and the discharge in one go, which is the point.
What if the pump does not stop?
Unplug it immediately — running dry destroys the motor. Then look at the float for obstruction, and replace the switch if it does not move freely.
Sources
Read next
Sump pump maintenance checklist
Twenty minutes a year, split into four short visits, is the difference between a pump that reaches ten years and one that fails at six.
Sump pump float switch not working
If a pump has stopped doing its job, the switch is more likely to blame than the motor — and it is a fraction of the price.
Sump pump keeps running: what is actually wrong
A pump that runs constantly is burning itself out, and in most cases the cause is a part that costs less than a tank of gas.
The best basement water alarms
An alarm that needs no network, no account and no firmware update. For an occupied house it is often the most reliable thing you can buy.
How long do sump pumps last?
Seven to ten years is the honest range. What decides where you land in it is duty cycle, pit size and the switch — not the badge.