For context, I live in Hong Kong where most people drink tap water after boiling first. Some may install water filter but may still boil the water. Very few drink bottle water unless they're outside and too lazy to bring their own bottles.
Now, I'm researching whether I can drink tap water in Iceland (I'm going there in August), and while it looks like the answer is affirmative, almost no web article mention whether I need to boil the water first. People in Japan (a country I've visited a few times) also seems to be used to drink tap water directly without boiling.
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?
It sounds like a stupid question but I just can't believe what I saw. I think I experienced a cultural shock.
Edit: wow, thanks so much for the responses and sorry if I didnt reply to each one of you but I'll upvote as much as as I can. Never thought so many would reply and Lemmy is a really great community.
2nd Edit: So in conclusion, people from everywhere basically just drink water straight out of tap. 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.
However, as the majority of Hong Kong people are living in high-rise buildings, a small amount of residual chlorine is maintained in the water to keep it free from bacterial infection during its journey in the distribution system. Therefore it is recommended to boil the water so that chlorine dissipates.
So, in short, I actually do not need to boil the water unless I hate chlorine smell and taste. But I guess I'll just continue this old habit/tradition as there's no harm in doing so.
Some Spanish cities: In Madrid, people drink tap water without boiling. Some leave it to rest so the slight chlorine smell leaves the water. In Barcelona and Valencia, being coastal cities with desalinators, their water is too "heavy" (has too high a density of minerals), which makes it unhealthy to consume on a regular basis, and boiling it does nothing, so people buy a lot of bottled water.
I have to say I've never seen people let their water sit or boil it, and I've been all over the place since 2010 in Spain. I know for hard (not heavy :)) water you can install (expensive) systems between the incoming water and your taps that can soften it, but I don't know how common they are. I would drink the tap water from any town in Spain without a second thought. Wouldn't you? A finca in the countryside, I might be sceptical, or a service station in the middle of nowhere, maybe not, but any "built-up" area, for sure.
Not related to drinking, but I've allowed water to sit so that the dissolved gases have time to escape
I don't drink tap water in Madrid because the one at my place smells weird. Idk if the pipes are rotten or what. I don't trust it.