Did you know that you can water your plants without paying the city or water company legally! Yes in-deed, by designing your homes plumbing drain system for Grey Water usage. There are various degrees of Grey-Water plumbing designs, most of which can be real simple and cost less than $500.00. When plumbing your new house all you need to do is ask your builder to put in a separate drain line with a couple of valves that connects up to your clothes washer, bathroom sinks, showers, and tubs. Most builders and plumbers think that the installation of a Grey-Water system is illegal. Not anymore, in January of 2001 the DEQ (Arizona Department of Environmental Quality) put their blessings on a Grey-Water system for residential use.