Free Water Quality Reports
Is Your Tap WaterSafe to Drink?
Check hardness, lead levels, and EPA violations for every US city. Based on official government data.
EPA SDWIS Data
Official federal source
Updated Regularly
Latest compliance data
Verified Standards
Compared to EPA MCLs
Tap Water Quality in Popular Cities
New York (c)
New York · 8.3M
Los Angeles
California · 3.9M
Boston
Massachusetts · 3.3M
Chicago
Illinois · 2.7M
Miami
Florida · 2.3M
Houston
Texas · 2.2M
San Antonio
Texas · 2.1M
Phoenix
Arizona · 1.7M
Baltimore
Maryland · 1.6M
Philadelphia
Pennsylvania · 1.6M
Las Vegas
Nevada · 1.5M
East Bay
California · 1.4M
Worth Monitoring
Cities with Water Quality Concerns
These cities have recent EPA violations or elevated contaminant levels
About Us
Making Water Data Accessible
We believe everyone deserves to know what's in their tap water. Our mission is to make EPA water quality data easy to understand and accessible to all Americans, helping you make informed decisions about your drinking water.
All data comes from official EPA sources including the Safe Drinking Water Information System (SDWIS). We update our database regularly to ensure you have access to the most current information available.
Resources
Latest from the Blog
Brown Tap Water: Causes, Safety & What To Do
Seeing brown or yellow water from your faucet is alarming—but usually not dangerous. Learn exactly why your tap water turned brown and how to fix it.
Cloudy Tap Water: Causes, Safety & When To Worry
That milky, cloudy water coming from your faucet is almost always harmless. Learn the simple 30-second test to tell if your water is safe.
Best & Worst Tap Water in the US: State Rankings 2026
Based on EPA violation data and water quality metrics, states like Hawaii, South Dakota, and Minnesota rank at the top—while Texas, Pennsylvania, and Arizona face challenges.