San Antonio

San Antonio, TX receives a water quality score of 74/100 (Grade C) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 9 public water systems serving the area.

San Antonio's water quality is near the national average. While most systems meet EPA standards, some violations have been recorded. Residents may wish to review their specific water system's report for contaminant details.

San Antonio's score of 74 is 2 points below the Texas state average of 76, and below the nationwide average of roughly 78/100 across all U.S. states.

Homebuyers and residents in San Antonio will find their drinking water supplied by one of several distinct systems serving this major metro area in South-central Texas. While the city's water quality achieves a generally satisfactory evaluation, the region's varied geology and proximity to the oil and gas industry can influence local water characteristics. With multiple water systems operating across the urban center, the specific water profile can vary depending on which utility serves a household.

Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our Texas water quality rankings report →