A number of regulatory agencies have adopted requirements that must be followed when producing, distributing, and using recycled water. The California Department of Public Health (CDPH) has adopted strict public health and safety requirements and guidelines, which help protect the public from any potential risk associated with use of recycled water. These requirements are described in Titles 17 and 22 of the California Code of Regulations:
http://www.cdph.ca.gov/certlic/drinkingwater/Documents/Lawbook/dwregulations-2011-07-14.pdf
Permits to oversee the production, conveyance, and use of recycled water are granted by the State Water Resources Control Board (SWRCB) and the corresponding Regional Water Quality Control Board(s) (RWQCB). Los Angeles County Department of Public Health and the Sanitation Districts of Los Angeles County also have guidelines and inspection requirements for the use of recycled water.