Compare Water Quality

See side-by-side water quality comparisons between any two US cities. Compare contaminant levels, safety scores, and EPA compliance data.

Popular Comparisons

Best vs Worst Water Quality

Compare Cities by State

How Water Quality Comparisons Work

Our water quality comparison tool lets you see side-by-side differences between any two US cities. Each comparison includes:

  • Overall Safety Scores - Letter grades from A+ to F based on EPA data
  • Contaminant Levels - Detailed breakdown of all detected contaminants
  • Compliance Records - EPA violation history and resolution status
  • Infrastructure Quality - Age and condition of water systems
  • Key Differences - Which city has better water in each category

All data is sourced from the EPA's Safe Drinking Water Information System (SDWIS) and updated quarterly.