1. (a) A site-specific cross-connection hazard assessment of the onsite nonpotable water treatment facility, storage facility, and distribution system must be conducted prior to the initial delivery of onsite treated nonpotable water and at least once every four years thereafter to confirm that the onsite potable water system is protected from contamination or pollution resulting from unintended cross-connection with the OTNWS.

2. (b) The site-specific cross-connection hazard assessment must consider and identify the following elements:

   1. (1) Actual and potential cross-connections between the onsite potable water system, nonpotable water system, and if applicable, any recycled water system;
   2. (2) Distribution system conditions that increase the likelihood of a backflow event;
   3. (3) Proper backflow protection(s) or action(s) required to eliminate and prevent any cross-connection(s) identified in subsections (b)(1) and (b)(2);
   4. (4) Connection(s) to supplemental water supply(ies); and
   5. (5) Any method to ensure containment at the point of potable water service connection, and if available, recycled water service connection.

Note: Authority cited: Sections 13558 and 13558.1, Water Code; and Sections 116271 and 116350, Health and Safety Code. Reference: Sections 13558 and 13558.1, Water Code.

History

1. New article 9 (sections 60700-60710) and section filed 4-22-2026; operative 4-22-2026 pursuant to Water Code section 13558(f) (Register 2026, No. 17).