According to the Numbeo water drinkability and accessibility index, tap water has a score of 42 / 100 (100 being best).
Numbeo considers this score to be "Moderate"
We are working on providing you with scientific reports about the water quality in Ulaanbaatar, if you know a reliable source for that feel free to shoot us a message in the chat below or in the comments!
1 adult could save about 394$ per year in Ulaanbaatar by drinking tap water instead of buying bottled water.
๐ณ Drinking tap water would also help with reducing your plastic footprint and improve environmental pollution.