1) Locate the sump pump in your basement or mechanical room. Unplug your sump pump. When you plug it back in, you should hear the pump running.
2) Remove the lid from the sump crock. Slowly pour some water from a 5-gallon bucket into the crock. Observe the sump pump switch. It should turn on and begin to pump water from the crock. Wait until the water pumps from the crock to ensure the pump turns itself off, then slowly pour the remaining water in the crock to ensure the pump turns on again.
3) Replace the sump pump if it fails either test.
Note: Consider calling Iron Horse Plumbing to install a backup battery pump.