The answer to 'sump pump maintenance' is regular inspection and testing of your sump pump to ensure it is functioning properly. This includes checking the pump itself, the float switch, and the discharge line for any clogs or damage.
It's recommended to visually inspect your sump pump at least every 3-6 months, and to test it by filling the sump pit with water to make sure the pump turns on and removes the water as expected. You should also check that the discharge line is not blocked and that water is flowing freely outside your home.