Interested in grey water? Check out this phenominal website by Oasis Design, an ecological design company in central California that specializes in grey water system design and other ecologically sound design practices.
The website is full of practical information about grey water and other water saving systems and you can also find a link to several books and dvd's that designer, Art Ludwig, has written on the subject:
For anyone interested in designing/installing a grey water system here in San Diego, you will first need to contact the Co. of SD Department of Environmental Health for information about local regulations:
For more detailed design guidelines from the California Plumbing Code (CPC) check out:
(note: for Grey Water Systems skip to Appendix G (pgs 38-48))