Is Your Tap Water Safe to Drink?
Search water quality reports for 18,775+ US cities. Get instant access to contaminant test results and certified filter recommendations.
18,775 cities21,000+ water systemsEPA dataNSF-certified filtersMCLG health guidelines
Check Tap Water Quality by City
View detailed tap water quality reports for major cities across the United States
New York, NY
8.4M people served
Los Angeles, CA
3.9M people served
Houston, TX
2.5M people served
Phoenix, AZ
1.7M people served
Philadelphia, PA
1.6M people served
San Antonio, TX
2.0M people served
18,775 Cities
Comprehensive coverage
EPA Verified
Official EPA data source
NSF Certified
Filter recommendations
EPA MCLG
Health-based guidelines
Explore Tap Water Quality by Category
Browse by state, search contaminants, compare water filters, and learn about EPA standards
What's In Your Water?
Look up any of the 608 contaminants in our database — health effects, EPA legal limits, MCLG health guidelines, and which filters remove them — or see where they show up on our national maps.
Make Sense of Your Water Test Results
Got a lab report or test-kit result you don't understand? Upload a photo or PDF — or type the numbers — and get a free plain-English read against EPA limits. Works for city water and private wells.
Free water test interpreter
Upload your report as-is. We read it line by line and explain what's high, what's fine, and what to do next.
Read my water test resultsFind the Right Filter for Your Water
Different contaminants call for different filters. Use our free, data-driven guides to match a filter type to what is actually in your tap water.
Multi-stage systems that reduce a broad range of contaminants, including arsenic, nitrate, and PFAS.
Under-sink filtersHigh-capacity filtration installed out of sight, treating the water at your kitchen tap.
Pitcher filtersA no-installation starting point; certified models reduce common contaminants such as lead and chlorine.
Whole-house filtersPoint-of-entry systems that treat every tap in your home, from the shower to the kitchen sink.
Water softenersReduce the hardness minerals behind scale buildup and spotting — matched to your area's water hardness.
On a Private Well?
Private wells aren't covered by the Safe Drinking Water Act — testing is up to you. Browse 3,103 county-level risk reports, see what to test for, and make sense of your well water testing results.
How Our Data Works
Our reports aggregate public records from EPA SDWIS (Safe Drinking Water Information System) and ECHO (Enforcement and Compliance History Online), together with the Consumer Confidence Reports (CCRs) that water utilities publish each year. We evaluate the contaminant levels those sources report using our EPA MCLG (Maximum Contaminant Level Goal) health-based methodology — the MCLG is the level of a contaminant in drinking water below which there is no known or expected risk to health.
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