Is Tap Water from the Bathroom Safe to Drinkの要点や背景を専門的かつ分かりやすくまとめました。全体像を一目で把握できます。

If you live in a house built before the mid-1980s, there’s a chance the pipes are made of lead or have lead solder. Water sitting in those pipes for hours, especially hot water, can absorb trace amounts of lead. This is a real health risk, particularly for children and pregnant women.

Another culprit is the water heater. That large metal tank in your closet or basement is a perfect breeding ground for sediment, rust, and even bacteria if it’s not maintained. The Environmental Protection Agency (EPA) actually advises against drinking from the hot water tap for cooking or drinking.

Fun fact: In the UK, it’s a cultural no-no to drink from the bathroom tap. Many Brits will look at you like you’ve just insulted their grandmother. It’s less about safety and more about tradition—and the fact that cold water tanks in attics are often open to dust.