LOL! that's a whole nether topic... Personally, I don't buy into the "wasteful" argument. We pay for it, we dispose of drinkable water which dilutes the polluted stuff in our public waters. Makes it easier to clean up. Since we pay for our water, we are paying for the manpower and materials to clean it up.
If we are really that concerned, I should see everyone emptying their bathtubs into their lawn and gardens. That is the best way to save water. Also, you can run your waste water line to the garden, pond or nuclear reactor to feel better about the waste.