1605.3 Cross-Connection Inspection and Testing. An

initial visual inspection and an initial cross-connection test shall be performed on both the potable and rainwater catchment water systems before the initial operation of the rain- water catchment system. During an initial or subsequent cross-connection test, the potable and rainwater catchment water systems shall be isolated from each other and independently inspected and tested to ensure there is no crossconnection in accordance with Section 1602.5. Initial or subsequent inspections or tests shall be performed in accordance with Section 1605.3.1 through Section 1605.3.3 .

1605.3.1 Visual System Inspection. Prior to commencing the cross-connection testing, a dual system inspection shall be conducted by the Authority Having Jurisdiction and other authorities having jurisdiction as follows:

NONPOTABLE RAINWATER CATCHMENT SYSTEMS

(1) Pumps, equipment, equipment room signs, and

exposed piping in an equipment room shall be checked. 1605.3.2 Cross-Connection Test. A cross-connec- tion test shall be performed in the presence of the Authority Having Jurisdiction or other authorities having jurisdiction to determine whether a cross-connection has occurred as follows: (1) The potable water system shall be activated and

pressurized. The rainwater catchment water system shall be shut down and completely drained. (2) The potable water system shall remain pressurized

for a minimum period of time specified by the Authority Having Jurisdiction while the rainwater catchment water system is empty. The minimum period the rainwater catchment water system is to remain depressurized shall be determined on a caseby-case basis, taking into account the size and complexity of the potable and rainwater catchment water distribution systems, but in no case shall that period be less than 1 hour. (3) Fixtures, potable, and rainwater shall be tested and

inspected for flow. Flow from a rainwater catchment water system outlet shall indicate a cross-connection. No flow from a potable water outlet shall indicate that it is connected to the rainwater system. (4) The drain on the rainwater catchment water system

shall be checked for flow during the test and at the end of the period. (5) The potable water system shall then be completely

drained. (6) The rainwater catchment water system shall then be

activated and pressurized. When rainwater is not available for the initial cross-connection test, a tem- porary connection to a potable water supply shall be required. At the conclusion of the initial cross- connection test, the temporary connection to the potable water supply shall be disconnected. (7) The rainwater catchment water system shall remain

pressurized for a minimum period of time specified by the Authority Having Jurisdiction while the potable water system is empty. The minimum period the potable water system is to remain depressurized shall be determined on a case-by-case basis, but in no case shall that period be less than 1 hour. (8) Fixtures, potable and rainwater catchment, shall be

tested and inspected for flow. Flow from a potable water system outlet shall indicate a cross-connection. No flow from a rainwater catchment water outlet shall indicate that it is connected to the potable water system. (9) The drain on the potable water system shall be

checked for flow during the test and at the end of the period. (10)Where there is no flow detected in the fixtures which

would indicate a cross-connection, the potable water system shall be repressurized.

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NONPOTABLE RAINWATER CATCHMENT SYSTEMS

1605.3.3 Discovery of Cross-Connection. In the event that a cross-connection is discovered, the following procedure, in the presence of the Authority Having Jurisdiction, shall be activated immediately: (1) Rainwater catchment piping to the building shall be

shutdown at the supply source(s), and the rainwater riser shall be drained. (2) Potable water piping to the building shall be shut down at the meter. (3) The cross-connection shall be uncovered and dis connected. (4) The building shall be retested following procedures

listed in Section 1605.3.1 and Section 1605.3.2. (5) The potable water system shall be chlorinated with

50 ppm chlorine for 24 hours. (6) The potable water system shall be flushed after 24

hours, and a standard bacteriological test shall be performed. Where test results are acceptable, the potable water system shall be permitted to be recharged.

326 2022 CALIFORNIA PLUMBING CODE

CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE