A sump tank, also known as a sump pit, is typically located in a home's basement or crawl space and serves as a collection point for excess water. It is designed to collect water that enters the basement through drains or from groundwater, and then pump the water out to prevent flooding or water damage. A sump tank is an essential component of a home's waterproofing system and can help protect your home and belongings from the harmful effects of water damage.