It ain't easy being green

I took the picture below at the new environmentally ultra-friendly Science and Engineering Building at UNLV. In order to conserve our precious water, it is reclaimed from other sources to fill the toilets and urinals. I guess the price you pay for being green is that we can no longer drink from said toilets and urinals. Bummer!

Here is an enlargement of the sign.

Is this sign really necessary?!? Keep in mind that this is at an institution of higher education... and in the science building. This isn't from some third world nation where people bathe in puddles!