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Similarly to how the arguments against incandescent bulbs do not apply to me, arguments for water conservation also do not apply to me.

I let the water run while I shave. I run the water while I’m brushing my teeth. And I run the water while I’m loading the dishwasher.

Why don’t I care? Because my house has well and septic.

Not only is water essentially free, but it also follows the law of the conservation of mass: water can neither be created nor destroyed.

How do I “use up” water by letting it run? Answer: I don’t. All I do is move it around.

Here’s a well-and-septic system:

Water gets pumped out of the ground, up to my sink. Then it flows down the drain and back into the ground. What is the problem with that? It’s a zero-sum game – the water travelled a little bit, but its amount and location didn’t change.

“Turn off the water while you brush your teeth, and it could save you 5 gallons of water a day.”
“Benefits include a reduced water bill and conservation of fresh water.”

I pay to run the pump. I don’t care about that cost, and I just showed that no water is wasted (i.e. removed from possible future use) by letting water run. I have yet to be convinced there is a good reason why I can’t let the water run as much as I want.

I could see how someone could argue against lawn watering because then much of the water evaporates and doesn’t go back into the ground. While the argument shouldn’t be that water is wasted (since it just changed phase rather than disappearing), I will agree that the water does change its net location. Why it’s bad to provide rain for someone else is another discussion. I won’t put up much of a fuss either way on that argument, because I don’t water my lawn. Why help your lawn grow when that just means you’ll have to cut it more?