Its the energy cost of collecting/pumping/treating tap water that is the big issue. Still,.. it hurts the environment more to eat meat than almost anything else, and I'm not about to give up steak! 
My horses work flat out to power my pumps and filters does this count all i get is animal rights people having a pop, for trying to be envro freindly
Commercial at the mo do not give a flying fig about the enviroment if you think they are fair play to you, im not here to try and change your mind, i tend to say "as it is, not what i think" commercial are trying to keep afloat they are also looking for cheaper way to get windows cleaned, some people :
real world please!