Actually the solution to your problem is a grey water system. Unfortunately the regulatory structure in place STRONGLY discourages the implementation of them making it virtually impossible. I was over at a friends house last month and he had a system in his place that was pretty sweet. He has a bigger lot then 8k sf, I think his is more like 12k sf and his system is not permitted. I have seen 2 other people do it as well. I don’t promote doing this because as Rustico pointed out in a previous post when I spoke about this, if they are not done properly there are serious health risks. The water cannot be airborne and there are a litany of safety measures to put in. Also each person did not plumb the entire home for the system, only a select number of areas. Furthermore I did not ask what they intend to do if they ever sell the home with regards to removing the system or not, and/or disclosure. Each was very happy with the water bill though as they saw reductions of more then half as yard watering dominates most peoples water bill.