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City Water Project
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Every tap is different
Your water quality changes on its way from the utility to your tap. Testing at home is the only way to know what you’re drinking.
Benchmarks explained
Learn more about the maximum contaminant level (MCL) and maximum contaminant level goal (MCLG) and how they differ.
#1 Home Water Test Kit 2023
Every tap is different, the Tap Score lab testing kit makes it easy to evaluate what’s in your water and what to do about it.
Where is this data from?
Annual utility reports
Utilities test at their facility throughout the year and publish the results. These reports (CCRs) can be hard to find. We take the time to gather them all every year.
Anonymized home tests
Water data is most accurate when sampled at the tap. We publicize our water testing data for free through this project so everyone can benefit.
Public water data
Beyond the CCR.
Learn moreMy state is missing!
All but 4 states have documented their water utility testing results in a way this is available to Tap Score. New Hampshire, North Carolina, New Mexico, and Louisiana have not made their water quality data available. We are working on gathering this information!