What is a sump pump?

A sump pump sits in a sump pit, a basin dug below the basement floor, and automatically removes water that collects there. As groundwater or surface water enters the pit, a float switch triggers the pump to activate and discharge the water through a discharge line to the exterior of the home, typically away from the foundation toward a storm drain or daylight.

Most Ontario basements rely on a primary pump powered by the home's electrical supply. Because power outages and pump failures can leave basements unprotected, many homeowners install a backup pump alongside the primary unit. Backup systems typically run on rechargeable battery power and activate when the primary pump fails or the water level rises faster than the main pump can handle.

Sump pumps matter because Ontario receives significant spring snowmelt and summer rainfall. Without a functioning pump, water pooling in the foundation perimeter or basement floor can cause structural damage, mold growth, and expensive repairs. They are particularly important for homes below grade or in areas prone to high water tables.