To confirm your sump pump is working properly, listen for humming and check for water flowing out the discharge pipe when the pump turns on. Examine that the float moves freely to activate the pump and the water level in the pit goes down after pumping. Also ensure the discharge line is clear, backup pumps are operational, and the pit smells dry. Contact a professional if you have any concerns about abnormal smells, water remaining in the pit, or lack of pump activation during wet conditions.