Sort of, but not really. The water on the input side of your tap is much more valuable than the sewer side. It's not usable for drinking water, it is usable fo

Sort of, but not really. The water on the input side of your tap is much more valuable than the sewer side. It's not usable for drinking water, it is usable for greywater purposes. If you've got a septic system, it'll go through that into the local ground water, if not, it'll go into the septic sewer and eventually to a treatment plant, and from there a river. If it was originally aquifer water, you've taken (likely) high quality water from a diminishing resource and put it in the environment.