US Water Quality Reports
Comprehensive water quality data for major US cities. Find detailed reports on water sources, contaminants, treatment facilities, and safety information.
Water Quality Grade Distribution
Find Your City
Browse water quality reports by state or search for your city below.
Cities by State
California
Pennsylvania
About Water Quality Grades
Our water quality grades are calculated based on multiple factors including compliance with federal and state drinking water standards, contaminant levels compared to health goals, treatment effectiveness, and historical water quality trends.
Grading Criteria:
- EPA and state compliance rates
- Contaminant levels vs. health goals
- Water source quality and protection
- Treatment facility technology
- Historical contamination incidents
- Overall trend improvements
Grade Meanings:
- A: Excellent water quality, exceeds standards
- B: Good quality, meets all standards
- C: Adequate, meets legal limits
- D: Concerns present, monitoring needed
- F: Significant issues, action required
Important Notice
Water quality data is compiled from publicly available sources including EPA reports, state environmental agencies, and municipal water quality reports. For the most current and detailed information about your local water quality, please contact your water utility directly or visit their official website.