A Traveller?s Guide to Tap Water

http://isthewatersafetodrink.com/colombia/

There's that...but it isn't accurate. Paints too broad of a brush. Also.....without first hand (Or multiple 3rd party) may be inaccurate.

Medellin, Colombia - drinkable tap water. Among the best anywhere. I measured it and researched it - lived there 5 years. As far as I know it is the only city in Colombia. Better than many parts of USA as there is no fluoride. It's a source of pride for the city.

Santiago, Chile - the Holiday Inn Express rep told me the water is safe. Reading tripadvisor too. I drank it, tasted fine. The rep said tourists might prefer to drink bottled water (fear). Not sure about other parts of Chile. Although at Unimarc grocery store in Punta Arenas, Chile I noticed all the bottled water has no minerals. Meaning it is ACIDIC. Bad. I did not find a brand that had minerals. Oh yeah...all the locals in Punta Arenas are pretty short (I'm 5'11"). Just an observation. May not be correlated strongly....will have to investigate this relationship.

Uruguay - websites above say not safe. Uh....WRONG! Hotel rep said tap water is good. So I researched it...you know, not being the trusting type when it comes to this.
https://en.wikipedia.org/wiki/Water_...ion_in_Uruguay

Puerto Piramides, Argentina - AirBNB host said the small town has a desalinization plant. I didn't drink it as I was only there a night. Not sure about other parts of Argentina.

Also safeness of tap water depends on your view of fluoride and level of chlorine. So "safe" is relative.