Exactly how well "treated" is water from a water/waste treatment plant?

[Bandit]

I heard on the news yesterday that vineyards from California are going to start using water from waste treatment plants because of such a water shortage they are experiencing. How will this effect the grapes or the wine? If this is OK why have they not done this before now?

[HereSince1628]

1. They probably have not done it before because it's a more expensive alternative

[struggle4progress]

2. It depends on the waste-water source and the treatment facility

All kinds of stuff gets flushed into some sewer systems

[JaneQPublic]

3. It's used to make Miller Lite beer.

Or so I assume.

[X_Digger]

4. Depends on the plant.

I have no qualms about drinking, bathing in, or cooking with water that's been properly treated.