1. (a) A cross-connection test is required prior to the initial delivery of onsite treated nonpotable water and at least once every four (4) years thereafter.
2. (b) A cross-connection test for the onsite nonpotable water treatment facility must be conducted in accordance with a cross-connection test procedure developed specifically for the treatment facility to determine whether a cross-connection has occurred. A site-specific cross-connection control test procedure for the onsite nonpotable water treatment facility must be prepared by a certified cross-connection control specialist and developed in accordance with the cross-connection hazard assessment required by section 60700 subsection (a).

3. (c) The cross-connection test procedure for the onsite treated nonpotable water distribution system must include the following steps:

   1. (1) The onsite potable water system shall be activated and pressurized. The onsite treated nonpotable water distribution system shall be shut down, depressurized, and drained;
   2. (2) The onsite potable water system must remain pressurized for a minimum period specified by the local jurisdiction while the onsite treated nonpotable water distribution system is depressurized and drained. The minimum period the onsite treated nonpotable water distribution system is to remain depressurized and drained shall be determined on a case-by-case basis, taking into account the size and complexity of the potable and the onsite treated nonpotable water distribution systems, but in no case shall that period be less than one (1) hour;
   3. (3) All fixtures for the onsite potable and onsite treated nonpotable water source, shall be tested and inspected for flow. Flow from an onsite treated nonpotable water outlet indicates a cross-connection. No flow from a potable water outlet may indicate that it is connected to the onsite treated nonpotable water distribution system and must be investigated to confirm that a cross-connection does not exist;
   4. (4) The drain on the onsite treated nonpotable water distribution system shall be checked for flow during the test and at the end of the test. Flow from an onsite treated nonpotable water distribution system outlet indicates a cross-connection with the onsite potable water system;
   5. (5) The onsite potable water system shall then be depressurized and drained;
   6. (6) The onsite treated nonpotable water distribution system must then be activated and pressurized. For the initial cross-connection test, a temporary connection to a potable water supply may be required to test the onsite nonpotable water system plumbing if approved by the public water system. The potable water supply shall be protected by a reduced pressure principle backflow prevention assembly or an air gap. At the conclusion of the initial test, the temporary connection to the potable water supply must be disconnected. Documentation of the disconnected temporary supply must be provided to the local jurisdiction;
   7. (7) The onsite treated nonpotable water distribution system must remain pressurized for a minimum period specified by the local jurisdiction while the onsite potable water system is depressurized and drained. The minimum period the potable water system is to remain depressurized and drained shall be determined on a case-by-case basis, but in no case shall that period be less than one (1) hour;
   8. (8) All fixtures for the onsite potable water system and the onsite treated nonpotable water distribution system must be tested and inspected for flow. Flow from a potable water system outlet indicates a cross-connection. No flow from an onsite treated nonpotable water outlet may indicate that it is connected to the onsite potable water system and must be investigated to confirm that a cross-connection does not exist;
   9. (9) The drain on the onsite potable water system must be checked for flow during the test and at the end of the test; and
   10. (10) Where there is no flow detected in the fixtures that indicates a cross-connection, the onsite potable water system may be repressurized.
4. (d) The responsible entity may propose an alternative cross-connection test procedure prepared by a certified cross-connection control specialist demonstrating that the procedure provides the same level protection of public health as subsection (c). The alternative cross-connection test procedure must be submitted in writing to the local jurisdiction and State Board. The alternative cross-connection test procedure must be approved by the local jurisdiction and State Board prior to conducting the cross-connection test.

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 section filed 4-22-2026; operative 4-22-2026 pursuant to Water Code section 13558(f) (Register 2026, No. 17).