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International Plumbing Code 2012 (IPC 2012)

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1301.1 Scope

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This section has been amended at the state or city level.
The provisions of Chapter 13 shall govern the materials, design, construction and installation of gray water systems for flushing of water closets and urinals. See Figure 1301.1(2).
FIGURE 1301.1(2)
GRAY WATER RECYCLING SYSTEM FOR FLUSHING WATER CLOSETS AND URINALS

1301.2 Installation

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In addition to the provisions of Section 1301, systems for flushing of water closets and urinals shall comply with Section 1302. Except as provided for in this chapter, all systems shall comply with the provisions of the other chapters of this code.
Above-ground drain, waste and vent piping for gray water systems shall conform to one of the standards listed in Table 702.1. Gray water underground building drainage and vent pipe shall conform to one of the standards listed in Table 702.2.
Drain, waste and vent piping for gray water systems shall be tested in accordance with Section 312.

1301.5 Inspections

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Gray water systems shall be inspected in accordance with Section 312 of the Plumbing Code and with Section 109 of the Building Code, 12 DCMR A.
Only connections in accordance with Section 1302.3 shall be made between a gray water recycling system and a potable water system.

1301.7 Waste Water Connections

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Gray water recycling systems shall receive only the waste discharge of bathtubs, showers, lavatories, drinking fountains, whirlpool bathtubs, clothes washers or laundry trays.

1301.7.1 Prohibited Sources

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Roof drainage and other stormwater drainage shall not be collected in gray water systems except for makeup purposes as provided in Section 1302.3.1. Gray water systems shall not receive waste discharge from any fixture installed in an I-2 occupancy.
Gray water shall be collected in an approved reservoir constructed of durable, nonabsorbent and corrosion-resistant materials. The reservoir shall be a closed and gas-tight vessel. Access openings shall be provided to allow inspection and cleaning of the reservoir interior.
Gray water entering the reservoir shall pass through an approved filter such as a media, sand or diatomaceous earth filter.
A full-open valve shall be installed downstream of the last fixture connection to the gray water discharge pipe before entering the required filter.
The collection reservoir shall be equipped with an overflow pipe having the same or larger diameter as the influent pipe for the gray water. The overflow pipe shall be trapped and shall be indirectly connected to the sanitary drainage system.
A drain shall be located at the lowest point of the collection reservoir and shall be indirectly connected to the sanitary drainage system. The drain shall be the same diameter as the overflow pipe required in Section 1301.10.
The reservoir shall be provided with a vent sized in accordance with Chapter 9 and based on the diameter of the reservoir influent pipe.
The holding capacity of the reservoir shall be a minimum of twice the volume of water required to meet the daily flushing requirements of the fixtures supplied with gray water, but not less than 50 gallons (189 L). The reservoir shall be sized to limit the retention time of gray water to a maximum of 72 hours.
Gray water shall be disinfected by an approved method that employs one or more disinfectants such as chlorine, iodine or ozone that are recommended for use with the pipes, fittings and equipment by the manufacturer of the pipes, fittings and equipment.

1302.3 Makeup Water

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This section has been amended at the state or city level.
Where an uninterrupted supply is required for the intended application, potable water shall be provided as a source of makeup water for the storage tank. The potable water supply shall be protected against backflow by an approved air gap fitting in accordance with Section 608.13.1.

1302.3.1 Makeup Water From Other Sources

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This section has been amended at the state or city level.
In addition to the makeup water required by Section 1302.3, makeup water supplied to a gray water system from a rainwater collection system complying with Section 1115 shall be allowed where approved. The design of the makeup water connection between the two systems shall be approved prior to installation. The overflow discharge of a rainwater collection system shall not pass through any portion of the gray water system.

1302.4 Coloring

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The gray water shall be dyed purple with a food grade vegetable dye before such water is supplied to the fixtures.
Distribution piping shall conform to one of the standards listed in Table 605.4.

1302.6 Identification

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Distribution piping and reservoirs shall be identified as containing nonpotable water. Gray water collection piping shall be identified so as to preclude drainage pipe connections from prohibited fixtures. Piping identification shall be in accordance with Section 608.8.

Section 1303 Subsurface Landscape Irrigation Systems

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1303.1 Collection Reservoir

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1303.1.1 Identification

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1303.2 Valves Required

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1303.3 Makeup Water

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1303.4 Disinfection

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1303.5 Coloring

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1303.6 Estimating Gray Water Discharge

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1303.7 Percolation Tests

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1303.7.1 Percolation Tests and Procedures

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1303.7.1.1 Percolation Test Hole

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1303.7.1.2 Test Procedure, Sandy Soils

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1303.7.1.3 Test Procedure, Other Soils

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1303.7.1.4 Mechanical Test Equipment

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1303.7.2 Permeability Evaluation

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1303.8 Subsurface Landscape Irrigation Site Location

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1303.9 Installation

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1303.9.1 Absorption Area

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1303.9.2 Seepage Trench Excavations

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1303.9.3 Seepage Bed Excavations

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1303.9.4 Excavation and Construction

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1303.9.5 Aggregate and Backfill

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1303.10 Distribution Piping

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1303.11 Joints

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