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
Los AngelesGrade: B-
California
vs
New YorkGrade: A+
New York
AustinGrade: A+
Texas
vs
DallasGrade: A+
Texas
San FranciscoGrade: A-
California
vs
SeattleGrade: A+
Washington
MiamiGrade: A-
Florida
vs
AtlantaGrade: A-
Georgia
ChicagoGrade: B+
Illinois
vs
HoustonGrade: A-
Texas
DenverGrade: B-
Colorado
vs
PhoenixGrade: B-
Arizona
PortlandGrade: A+
Oregon
vs
San DiegoGrade: A+
California
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.