Celebrating 25 Waterful years of providing water and wastewater services to more than 1.8 million customers in the San Antonio region, San Antonio Water System continues to set the standard within our industry. SAWS is the national leader in water innovation with the largest direct recycled system in the country, the largest groundwater-based Aquifer Storage & Recovery facility in the nation and was the first in the U.S. in converting methane gas to energy, making this wonderful city... Waterful.