San Bernardino

San Bernardino, CA receives a water quality score of 93/100 (Grade A) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 11 public water systems serving the area.

San Bernardino's water quality is above the national average, with strong compliance records and low contaminant levels. Residents generally receive clean, safe tap water that meets EPA standards.

San Bernardino's score of 93 is 4 points above the California state average of 89, and above the nationwide average of roughly 78/100 across all U.S. states.

For residents and prospective homebuyers in San Bernardino, this large California city's tap water consistently meets exceptional standards of quality and safety. Navigating a West Coast region marked by varied geology, major urban hubs, and nearby agricultural activity, the city's water infrastructure relies on multiple distribution systems to deliver clean, reliable service. This strong performance means households can trust their tap water for everyday use, reflecting a well-managed network that effectively handles the complex environmental demands of the surrounding area.

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