One thing to consider: While tab water in most of the developed world is potable,any water safety guarantees usually end where the house water pipes begin. Depending on the state of the piping, tap water might not be safe, even if the water supplyer says it’s safe.

You can get a water test (especially bacteria is important) for relatively cheap. Last time I did such a test it was ~€60. It’s not wrong to do one.

Also, the definition of potable water is that the water is potable after the tap has been running for 10(!) minutes.

Bacteria contaminated pipes are pretty common and if the water has been sitting in these biofilm-covered pipes over night or even longer, the water can become pretty harmful. Especially after you get home from a vacation, letting the water run for a decent amount of time might be a good thing.

Also: the worst thing that can happen to your water pipe system are blind pipes, so pipes that are connected only on one end. That could be e.g. left-over plumbing after remodeling or pipes that lead to unused taps. If at all possible, these ahould be removed or flushed at best daily.

US here. Yes, can confirm I can, and do drink water from the tap without boiling. The city provides, maintains, and regularly checks the safety of the water. Notices are put out if something damages the pipes and a “water boiling” policy is put out promptly over local radio and/or newspaper.

Berlin, Germany: we drink water straight from the tap. It’s free and delicious. If you don’t feel like drinking tap, just drink a “Berliner Rohrperle”. It’s the same thing with a fancier name, because our tap water is awesome.

Nowadays we even have public drinking fountains dotted around the city.

Lol, I was you 10 years ago. For context I’m Malaysian and we only drink water that is first filtered and then boiled. When eating outside we generally avoid iced drinks unless it’s a reputable shop.

Then I moved to Australia and reacted with utter horror to see my then-bf drink straight from the tap. I was like wtf you’re going to get parasites! Spit it out!

Now I drink water like Aussies and my kid refills her bottle from the tap too. My parents, when they visit, still boil water to drink but they’ve at least stopped thinking we’re trying to murder their grandchild.

At home I exclusively drink tap water. I only boil it for tea sometimes :) I‘m from Germany.

yep, i’ll drink straight from the tap. i live in california, united states. it is even common to have drinking fountains in public spaces: special button activated taps that spurt cool tap water into the air for you to drink from.

I live in Melbourne Australia and we drink water straight out of the tap. Even restaurants give you tap water

The further I searched, the more it seems to me that in developed countries (like US, Canada and the above examples), tap water is safe to drink directly. Is that true? Do you drink tap water without boiling?

Yes. It’s a bit of a scandal when that’s not true. (Canada here)

And to my surprise, I checked the Water Supplies Department website and notice it asserts that tap water in Hong Kong is potable, like many well-developed countries and regions.

Boiling it has to be “force of habit”, then. I wonder how long it’s been potable. I’m guessing mainland China is mostly boil-first.

Australian here, yes. Our tap water is pretty good

Netherlands: our tap water is better than bottled spring water

In the US, the only time you’d have to boil water before drinking in most places is if there’s something wrong with the water system and they put out a “boil water” advisory, and that’s pretty rare. It’s definitely not something you have to on a daily basis. Some people will use water filters but it’s not usually a necessity.

México. NO. Do not drink the tap water. Boiling does not help. It has a bunch of heavy metals and other contaminants in it. It sucks because mechanical filtering is incapable of removing them effectively. Reverse osmosis does but it is a challenging and expensive process to properly keep in your house. We always buy bottled water. Trucks deliver twice a week.

Important:

Despite the overall quality of the water in the region, the water pipes can ruin it. If you got lead pipes you should avoid drinking the water or using it for cooking. Boiling won’t change it.

In Germany, landlords are legally required to tell you if there are lead pipes in your house, don’t know about other countries. Typically, the risk of having lead pipes is higher if the house is older.

TL;DR: lead pipes are very bad

In this US, yes, we generally trust our tap water (although there have been notable incidents of water infrastructure failures, such as major lead contamination in Flint, MI), to the extent that if you get a drink in a restaurant here, 99% of the time it’s going to be mixed or made using tap water, with ice made from tap water.

Some folks will use a filter (Brita brand filter pitchers used to be popular at one time, with TV ads and everything) but that’s more for filtering out chemicals/toxins/minerals than anything else.

In rural places, every now and then the local government or water company (yes, a lot of places here have privatized water infrastructure which is not super great) will put out a ‘Boil Water Notice’ but this is generally considered outside of the norm, and you usually expect to see that kind of stuff resolve within a couple of days unless it’s a result of a major disaster (we were under a Boil Water notice for 2 weeks after hurricane Katrina in my area, the longest stretch I ever remember). Boil Water notices are usually a result of either a breach of the infrascture (a pipe collapsing and the water supply getting dirty), or a water supply failing its regular quality/safety tests. Our water (can’t speak for everywhere in the US, and don’t really know the specifics of how they do it) is chemically treated and filtered before it goes into the tap, and the supply mechanisms are usually regularly tested to make sure they’re within safe standards.

All of that being said, I know people who refuse to drink tap water, mostly because it tends to have a distinct taste from treatment and from having minerals in it, but also because they’ve heard horror stories like in Flint. Two things: those folks normally drink bottled water, which is usually just bottled-up tap water from some other place; and I usually see those folks gladly drinking fountain drinks/tea/etc at a restaurant, which is made with un-boiled tap water and served on tap-ice.

TL;DR - the tap water in the US is generally considered safe to drink, in most places, with notable exceptions, and for now (our mostly-privatized infrastructure is getting worse and worse, and very public failures have started to appear in not only water infrastructure, but everywhere)

Italy here: tap water is drinkable BY LAW, at least inside houses and public places.