It depends on where you are, I'd say. If you live in a water-rich area, water itself should be fine to use. The question is how much energy goes into heating an

It depends on where you are, I'd say. If you live in a water-rich area, water itself should be fine to use. The question is how much energy goes into heating and cleaning it afterwards though. If you live in a water-poor area, it's a different story. edit: And the cycle is impacted as well, depending on the water flow. Here, water comes out from the aquifier, and is then entered into a river, so it is a shortcut (no spring, no small trickles that join together, and no staying within the aquifier, so the level might be lowered). If this is a problem or not depends on the specific situation.