What is the primary function of a sump pump?

The primary function of a sump pump is to remove accumulated water from a sump basin. It is specifically designed to prevent flooding in basements or crawl spaces by actively pumping out water that collects in a designated pit or basin. This pump is essential in areas where groundwater is prevalent, as it helps maintain a dry environment and protects the structural integrity of the building. By efficiently managing excess water, sump pumps also reduce the risk of mold and water damage.

The other options describe functions not related to sump pumps. Supplying water pressure to fixtures pertains to a water supply system; heating water relates to water heaters and heating systems; and filtering contaminants involves water purification systems. Each of these functions is crucial in plumbing but does not overlap with the sump pump's primary role of water removal from a sump basin.