Guides
Tap water safety, explained
Clear, data-backed answers to the questions people actually ask about drinking water — from the safest tap water in the world to whether boiling really makes it safe. Every guide is grounded in the same official data behind our country, state and région scores.
The Countries With the Safest Tap Water in the World
Which countries have the cleanest, safest tap water — and which to avoid drinking from the tap. Ranked from official WHO/UNICEF data.
Read guideUS States With the Cleanest Tap Water (and the Least Safe)
The US states with the best drinking-water compliance — and the ones with the most health-based violations — from real EPA data.
Read guideDoes Boiling Tap Water Make It Safe to Drink?
Boiling kills germs — but not everything. Here’s exactly what boiling tap water removes, what it doesn’t, and how long to boil.
Read guideIs the Chlorine in Tap Water Safe to Drink?
Why there’s chlorine in your tap water, whether it’s harmful, and the easiest ways to get rid of the taste and smell.
Read guideHow to Tell If Your Tap Water Is Contaminated
Cloudy, brown or smelly water — what each warning sign means, which contaminants are invisible, and how to test your tap water.
Read guideIs Tap Water Safe to Drink While Traveling?
A traveler’s guide to drinking tap water abroad — how to check before you go, and the rules for water, ice, brushing teeth and food.
Read guideCan You Drink Tap Water in Europe?
Tap water is safe across most of Europe — but not everywhere. Here’s the country-by-country picture, from safest to riskiest.
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