Water Quality Lookup / Water Quality

EPA SDWIS · 1 state profiled

Water Quality Reports

Real EPA and state water quality data, organized by state. Search any US address above, or browse a fully profiled state below.

Data current as of July 2026

🔍Straight from EPA

🧪Real Lab Results

📅Updated Quarterly

🏠Local Expertise

Coverage right now: 1 state profiled, 58 counties, 15795 water providers tracked.

Browse by state

California

58 counties · 15795 water providers profiled

View full state report →

Live in this area? Simple Water Heater & Filtration can size a filtration system to whatever's actually on file for your utility.

Want a different ZIP, city, or address?

Look up your water quality →

Learn more

What is TTHM? Understanding EPA Violation Status Is Chromium-6 Dangerous? Whole-House vs. Under-Sink Filtration Lead and Copper in Drinking Water What is PFAS? Arsenic and Uranium Explained Nitrate and Fluoride Explained Water Hardness, pH, and Turbidity What is Coliform Bacteria?