The answer to 'what is sump pump' is a submersible pump installed in the basement or crawl space of a home to remove excess water that accumulates in the sump pit. Sump pumps are an important part of a home's drainage system, helping to prevent water damage, flooding, and mold growth by pumping out groundwater or stormwater that collects around the home's foundation.
Sump pumps are typically activated by a float switch that turns the pump on when the water level in the sump pit rises to a certain point. The pump then discharges the water through a pipe to a safe location, such as a storm drain or dry well, away from the home's foundation. Sump pumps are an essential component of a home's water management system, especially in areas with high groundwater levels or that are prone to flooding.