Murican here: I only boil if there's a boil alert, but I always run tap water through a carbon or ceramic filter even though tap water is supposed to be regulated and safe to drink. I think it just tastes better and I am a little mistrustful given disasters like Flint Michigan.

Here in Austria(and some other places in Europe), tap water usually is better quality than bottled water. Even where it isnt, its chlorinated enough so there should be nothing in there to cause any sort of health issues. This seems to be the case everywhere in Europe in myexperience.

Poland: water is always drinkable from the tap.

Spainiard here. You can drink tap water everywhere (that's connected to the drinking water network, obviously), but there are better tasting waters than others. Madrid's water is bad, Barcelona's is atrocious (I don't know anyone living there that doesn't buy bottled water, it even gives weird flavours when cooking), but other places are nicer. My town's water is awesome, I just fill up bottles from the tap and put them in the fridge for easy cold water and laugh at the camacus.

US, New York, I don't boil my water (I have to specify state as people in flint michigan probably disagree)

You'll be fine in Iceland.

American from Indiana here. Yep, all the time.

In the US, tap water is regulated to higher standards than bottled! In the rare cases where there is a problem with it, everyone gets notified, for example http://www.msdh.state.ms.us/msdhsite/_static/23,0,148.html.

NYC prides itself on having really good water, both for local food production, and just for taste. NYC did this by buying up land around its reservoirs further inland and building a large aqueduct system. The water isn't even filtered!

That said, some locations have unpalatable water, such as towns near the ocean that get their water from nearby wells.

Acc. to this site it's fine to drink cold water without boiling in Iceland. However don't drink the tap warm water - it's sulphurous.

But answering your question, in Brazil it varies from city to city. I drink tap water in my city just fine, without boiling or filtering; but I had to do both in another city ~400km from here.

Interestingly it's perfectly safe to drink tap water in Hong Kong. But tradition and fear of the government keeps water boiling alive.

https://www.mychinainterpreter.com/china-travel-guide/can-you-drink-tap-water-in-hong-kong/

As opposed to say parts of the US where you really shouldn't drink tap water but everyone does anyway. Flint Michigan looking at you.

In Argentina, generally you can drink straight from the tap.

In Malaysia, the water is advertised as safe to drink. Large majority however, either boils it or uses their own water filters.

Austria here, I drink tap water without boiling all the time without thinking twice about it. Pretty much in the entire EU I feel safe doing so.

Canadian in a major city - yes, safe to drink right from the tap.

However, many remote communities here do not have access to safe drinking water.

Here is Jamaica it is safe to drink the tap water without boiling.

Joining the choir from Italy - we too drink without boiling.

Austria here. Yes, drink from tap, especially Wien. You won't find mineral bottled water for sale easily.

In Canada I don't boil it.

In Vietnam, I do. Although more because I'm always making tea than anything else. Unless it's well water, in which case that's only for doing dishes, I won't drink that.

I did nearly die from cholera some years back, but it was probably not from the tap water specifically. Sanitation and food safety has really improved here in the last decade, I'm happy to say.

Croatia here,

tap water is completely drinkable and safe without any boiling. Exception are some more remote islands, so if you are going on some island, chekc if the tap water is drinkable.

Fun fact: Croatia actually uses drinkable water for toilets as well, altough i would not drink from a toilet :)

If its brown gulp it down, if its black send it back

Modern treatment plants don't use chlorine anymore, they use cloramines that have little scent or taste. This is most likely the case in HK as well.

Boiling water that doesn't need to be boiled is a waste of energy and GHG.

After moving to the city I have to buy cannister water, because regular water is chlorated, not even ozonated, it tastes awful and not healthy.

I remember once after a long absence (1+ year) in my district, tap water literally felt sweet.