Drinkable
Tap water is drinkable everywhere in Belgium. It is very strictly controlled. Sometimes you see a white substance when you boil the water. That is chalk. Chalk is not harmful to health. Chalk is also in milk, for example.
Tap water is drinkable
Tap water is drinkable in Belgium. Only if there is a sign saying it is prohibited, then you cannot drink the water.
Drinkable water
Not drinkable water
Prohibited sign
If there is a prohibited sign on a tap, then that water is not drinkable. It might be rainwater from a well.