There is often confusion about the difference between graywater and blackwater. The EPA defines graywater as "domestic wastewater composed of wash water from kitchen, bathroom, and laundry sinks, tubs, and washers," and blackwater as "water that contains animal, human, or food waste."
"All aspects of grey water systems. Why to use them, how to choose, build and use them, regulations, studies, and examples. Includes grey water irrigation, grey water treatment, grey water filters, and indoor grey water reuse."
This site offers information on a variety of greywater technologies, as well as other useful links.
The WRRC was established in 1957 with the mission to provide statewide outreach and education focused on critical water issues affecting Arizona and to provide expertise on state and regional water management and policy. The link outlines information on how residential consumers can reduce their potable water consumption by reusing greywater for landscaping and harvesting rainwater. In addition, the site contains information on more sophisticated commercial greywater reuse systems.