[Rotundo]

Tap water, unfiltered, in the Netherlands. It regularly tests better than bottled water.

In fact, the quality controls for tap water are more strict than for bottled water:

https://www.drinkwaterplatform.nl/fleswater-vs-kraanwater-wa... (in Dutch)

https://www-drinkwaterplatform-nl.translate.goog/fleswater-v... (Machine translated to English)

[JohnFen]

> the quality controls for tap water are more strict than for bottled water

This is true in the US as well.