it is true not all recycled water plants are created equal, and some areas do post signs like the ones you speak of. it really just boils down to how much water is available in your area, and how much money is in that city's budget as to whether or not they will recycle the water as a nonpotable or a safe to drink resource. As you'll find in other posts around here, there are several well known places that drink recycled water such as Singapore and orange county CA. :)