vodovod

1. water supply system; water mains
   Selo je tek prošle godine dobilo vodovod. — The village only got running water last year.
   Voda iz vodovoda je ovde sasvim pitka. — The tap water here is perfectly drinkable.
2. (of a company) waterworks; water utility
   Zvao sam vodovod zbog kvara u ulici. — I called the water utility about the breakdown on our street.

"Voda iz vodovoda" is the usual way to say tap water.