From the 2022 NYC Building Code:

1705.38 Special inspection for nonpotable water systems.

Testing and inspection of nonpotable water systems shall be in accordance with Chapter 13 of the New York City Plumbing Code. The special inspector shall witness all required tests in accordance with Chapter 13 of the New York City Plumbing Code.

1705.38.1 Tests for nonpotable water systems. Tests of nonpotable water systems shall be performed in accordance with Sections 1705.38.1.1 through 1705.38.1.2 of this code.

1705.38.1.1 Water storage tanks. Water storage tanks shall be tested in accordance with Sections 1302.12.2 and 1303.15.4 of the New York City Plumbing Code.

1705.38.1.2 Roofwashers. Roofwashers shall be tested in accordance with Section 1303.15.2 of the New York City Plumbing Code.

1705.38.2 Special inspection of nonpotable water systems. Inspections of nonpotable water systems shall include the following as applicable to the system:

1705.38.2.1 Visual inspection that components of such systems are complete in accordance with the manufacturers’ instructions and the approved construction documents;

1705.38.2.2 Required labeling, operational instructions and safety signage properly posted.

1705.38.2.3 Inspection of vermin and insect protection. Inlets and vents to the system shall be inspected in accordance with Sections 1302.12.5 and 1303.15.7 of the New York City Plumbing Code