Like the water in Flint? I’d prefer a private commercial service for that. At least you wouldn’t have to live with contaminated tap water for 5 years because of incompetent government run monopolies.
Third world countries like the US might handle drinking water quality somewhat different, I acknowledge that.
So maybe roads are somewhat easier to grasp. They are paid for by taxes and while you could outsource that to private parties, having to pay a bribe each kilometer seems rather complicated to me.