D.C. Mun. Regs. tit. 12, r. 12-F1304
General. The provisions of this section shall govern the construction, installation, alteration and repair of systems supplying reclaimed water.
Water pressure-reducing valve or regulator. Where the reclaimed water pressure supplied to the building exceeds 80 psi (552 kPa) static, an approved water pressure-reducing valve shall be installed to reduce the pressure in the reclaimed water distribution system piping to 80 psi (552 kPa) static or less. Pressure-reducing valves shall be specified and installed in accordance with Section 604.8.
Reclaimed water systems. The design of the reclaimed water systems shall conform to ASTM E 2635 and accepted engineering practice.
Distribution pipe. Distribution piping shall comply with Sections 1304.3.1.1 through 1304.3.1.3.
Exception: Irrigation piping located outside of the building and downstream of a backflow preventer.
Materials, joints and connections. Distribution piping conveying reclaimed water shall conform to standards and requirements specified in Section 605 for nonpotable water.
Design. Distribution piping systems shall be designed and sized in accordance with Section 604 for the intended application.
Labeling and marking. Nonpotable reclaimed water distribution piping labeling and marking shall comply with Section 608.8.
Tests and inspections. Tests and inspections shall be performed in accordance with Sections 1304.4.1 and 1304.4.2.
Water supply system test. The testing of makeup water supply piping and reclaimed water distribution piping shall be conducted in accordance with Section 312.5.
Inspection and testing of backflow prevention assemblies. The testing of backflow preventers shall be conducted in accordance with Section 312.10.
Strike Chapter 14 of the International Plumbing Code in its entirety without substitution.
D.C. Mun. Regs. tit. 12, r. 12-F1304