The Environmental Working Group's Tap Water Database lets you look up exactly what contaminants have been detected in your local water supply — and how they compare to health-based safety limits.
Search Your Water SupplyGovernment reports tell you if your water is "legal." The EWG database tells you if it's actually safe — there's often a significant difference.
EWG is a nonprofit, non-partisan organization. Their tap water database is built from government water quality data — independently analyzed and presented without industry influence.
EPA legal limits are often decades old and based on outdated science. EWG sets its own health guidelines based on current research — giving you a more accurate picture of risk.
The database covers over 50,000 water utilities across all 50 states, representing drinking water for more than 280 million Americans.
EWG continuously updates the database with the latest utility testing data so you're always seeing current information about your local water supply.
It takes less than two minutes to find out what's in your local water supply.
Visit ewg.org/tapwater and enter your zip code or search by your water utility name to pull up your local water quality report.
Open EWG Tap Water DatabaseThe report lists every detected contaminant in your water supply, how it compares to EPA legal limits, and EWG's own health-based guidelines — which are often stricter.
Many contaminants are "legal" but still pose long-term health risks. EWG's database shows you the full picture — not just whether your utility passed a government test.
Utility reports show averages across thousands of homes. Your individual tap may be different — especially with older pipes. A free in-home test gives you the real answer.
Schedule My Free Water TestOnce you've seen your EWG report, the next step is a free in-home water test. We'll test your specific tap — not just your utility's average — and show you exactly what's coming out of your faucet.