I have written about my work place's effort to be green before. While there are some water savings, I would suggest it has generally been a miserable failure. This is because it is not controlled by anyone. Things are put in place by contractors at the whim of someone.
Waterless urinals stink, and so no one is using them and instead using individual toilets, although some must use them or they wouldn't stink. The individual toilets use far more water than the old urinal would. They have half and full flush buttons, but they are not maintained. They all full flush.
The hot water unit had to moved to put in a safe working stair case for roof access. Flow restrictors and aerators were added to the hand basins. Result, no hot water at basins unless you wait more than three minutes of running water. Even then, it is only tepid.
Recycling bins. There is a metal/glass recycling bin and an office paper bin. These are together in a often walked past area, but there is no general rubbish bin nearby. You can guess what happens. For people to use recycling bins, there must always be a general rubbish bin too, or the recycling bin will be so badly contaminated, it is pointless. Idiots.
Of course where most of the rubbish is generated, the staff eating room, there is only a general rubbish bin. Bottles, cans, newspapers, food scraps all go in the general bins.
Tanks. We have them with pumps. So poorly planned. Less than half the roof catchment is utilised. One 20,000 litre tank empties from full in two weeks and reverts to mains water while others never drop below 3/4 full.
I am not qualified to criticise plumbers, but if tanks need an overflow, isn't it possible that as much water needs to flow out of a tank as can flow in. Why have a huge inlet pipe and an overflow pipe half the size? The result of course is water just floods out of the tank in a heavy downpour once the tank is full.
Quite exasperating really. I wish I could care more.