PW that is a good question. As for well costs, they vary according to the depth. As for drilling you also may very well have title restrictions or ccrs in newer subdivisions that prevent it.
Esmith – as to the restrictions about the greywater system, they are numerous but not impossible to overcome. There are alot of books about creating them. It may be worth the time to simply pick one of them up. Also the robustness of your system is up to you. Most people grab the easiest outflows such as the washing machine and maybe downstairs bathroom sinks. Kitchen outflow is discouraged but that is up to you. As for the restrictions about not exposing the greywater to air and such, again, many people think that the current reglations are way overkill and I tend to agree but am by no means a health expert.
I honestly do not believe that a greywater system jeopardizes your health within the confines of your lawn and such. Also regarding vegetables it is very arguable that the amount of pesticides and types of fertilizers used in commercial farms are a hell of alot more sketchy then a grey water system.
That is only an opinion and not based on anything official by any means. All I am saying is maybe read about them and learn up on them and then form an opinion.
