Clean water down the toilet:

Clean water down the toilet: more than a drop in the bucket

The main way Americans use water at home is flushing the toilet — 18.5 gallons per day per person, writes Kathleen Parker. And the water is as pure as the drinking water that runs from our taps. Translation: 5.7 billion gallons of clean drinking water down the toilet each day.

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Well... the dog needs clean water to drink.

Essentially, we recycle the majority of the water that is flushed, so I'm not sure how much to worry about it. The cost of providing clean drinking water and treating drain water are an issue, but very little water is lost overall.

I think I would take more of an issue with the trillions of gallons people use to keep their grass green, but again, that water is not really lost either.

Remember, in many cases, the water you flush down the toilet, and use elsewhere, becomes the drinking water for the next town down the stream.