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.

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.

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.

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.

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.

Netherlands: our tap water is better than bottled spring water

Finland

Yes. Our tap water is among the cleanest on earth

UK. Yip. Water "hardness" varies across the country which means people usually prefer the taste of the water in the region they grow up in. Other than all the leaky underground pipes and lack of investment in a privatised service, UK water is actaully very good.

Manila, Philippines: My drinking water comes from a delivery service that drops off a few blue containers of drinking water every few days. I've never swallowed tap water but I do use tap water when rinsing after toothbrushing. The sticker on the blue containers has the company name on it, contact details (obviously), and something about "18-stages latest US technology".

Argentinian here, depends on the region of the country, in most places it's safe to drink tap water although it usually has too much chlorine or in small rural cities like mine sometimes there's a bacteria leak on the water so we prefer to buy bottled water

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

Australian here, yes. Our tap water is pretty good

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.

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

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 Germany tap water is considered "one of the most strictly controlled food products"

Tap water in Brazil is supposed to be drinkable, but I use a filter anyways because I don't trust the companies.

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, I regularly drink water from the tap without boiling it.

The only exception is if Sydney Water issue a "Boil water" alert. That usually only happens after really major flooding though.

I never drink water out of the tap because I prefer to filter it first. It’s safe to drink but I want it clean and much colder so into a filter pitcher and put that in the fridge

Australia here, yes most people drink it without boiling but it depends a little what region you’re in. Some bits of the fat north or some island towns, you may be better off boiling it. Lots of people in the city use built in filter taps but I kind of write that off as con job.