Boil the water and the mentioned pathogens in the UN report won’t be of any concern. The locals all drink the tap water after boiling it and many don’t bother to even do that.
On top of what has been written by @toy and @user34936, which I can support 100%, I would like to give you the following advice:
When traveling to remoter areas in Asia (I would count Laos into that), and specially if you do not do so frequently (several times a year), you are risking to get Diarrhea as a minimum and intestinal parasites as a worst case scenario where you run risk of severe organ damage in the long run. While the risk is, as mentioned, highest in India, there are 2 levels of caution that go along with the amount of inconvenience you have to face to execute them:
Easiest level, should prevail in most developing countries in Asia, can be ignored in Japan, mostly also in Hong Kong & Singapore for example:
Next level, should be observed in any remote, rural area of the developing countries outside of international hotel chains and in almost all of India:
The issue here is that you have to decide how much you want to reduce your flexibility in the country to avoid a light diarrhea and how much experience you have when traveling across the world in remote places. You body will build up resistance against a lot of bacteria types if ingested in small quantities. However I know a person who lived in China and other places such as Hong Kong for all their life who got a parasite in India that caused a almost 100% kidney failure and repeated operations over the following years. Also: While asking for bottled water might become quickly expensive since the hotels try to sell you Perrier etc, asking specifically for local bottled water is often a safe but very cheap alternative.
Also consider that Diarrhea as such might not bother you too much, but dehydration and other consequences of that issue might cause more trouble that might severely disrupt the trip for you.
I would personally advise against it, unless you plan on staying there for a long time and are trying to get used to it.
I found a UN report about water quality in Laos. You should read it for yourself to get the details, but here in short:
I am not so sure how likely those are to occur, but be aware that your immune system not being used to this water, you’re more likely to get sick compared to the locals.
If you still want to drink the water, you should find out where the water in the tank comes from. Also ask the locals, while them drinking the water is no guarantee of it being safe, them not drinking it would indicate that there’s something really wrong with it.
It’s not safe to drink from the tap in those areas, Laos, Thailand, etc. If possible please ask for bottled water. You might not get sick immediately as you will of some parts in India but it’s not safe.
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