Daly City

Daly City, CA receives a water quality score of 90/100 (Grade A) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 1 public water system serving the area.

Daly City'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.

Daly City's score of 90 is 1 point above the California state average of 89, and above the nationwide average of roughly 78/100 across all U.S. states.

For households and prospective homebuyers in this mid-size California community, Daly City's single water system delivers highly reliable tap water that stands out for its excellent quality. Managing water quality here requires managing the unique environmental conditions of the West Coast, where local supplies are shaped by surrounding urban centers, Central Valley agriculture, and diverse geological formations. The consistently high marks earned by the local system demonstrate that robust filtration and monitoring are effectively mitigating these regional runoff and mineral challenges. This strong performance offers residents regulatory reliability, ensuring that clean, compliant water remains a dependable standard for the entire municipality.

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 →