California Health & Safety Code
Defininition of Graywater
17922.12. (a) For the purposes of this section, "graywater" means
untreated wastewater that has not been contaminated by any toilet
discharge, has not been affected by infectious, contaminated, or
unhealthy bodily wastes, and does not present a threat from
contamination by unhealthful processing, manufacturing, or operating
wastes. "Graywater" includes wastewater from bathtubs, showers,
bathroom washbasins, clothes washing machines, and laundry tubs,
but does not include wastewater from kitchen sinks or dishwashers.