Know Your Water Quality
Independent water quality grades for every US zip code
44,000+
ZIP codes analyzed
300+
Contaminants tracked
120K+
EPA violations analyzed
Worst Water Quality (F Grade)
Best Water Quality (A Grade)
How TapWaterGrade Works
1
We Gather Data
EPA ECHO database, Envirofacts API, and Safe Drinking Water Act violations
2
We Analyze
Process contaminants, violations, severity, and compliance data
3
We Grade
Apply consistent A-F grading based on water quality metrics
4
You Search
Look up your zip code to see your local water quality grade
Browse by State
Explore water quality grades across all 50 states and territories
View All States