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Chapter 15 Rain Water Harvesting Systems

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This section has been amended at the state or city level.

Section 1501 General

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1501.1 Scope.

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The provisions of this Chapter shall govern the materials, design, construction and installation of rain water systems for automatic clothes washers, flushing of water closets, flushing of urinals, and cooling tower makeup water. Nothing in this Chapter shall be construed to restrict the use of rain water for outdoor irrigation.

1501.2 Health and Safety

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Nothing contained in this Chapter shall be construed to prevent the local government from mandating compliance with stricter requirements than those contained herein, where such requirements are essential in maintaining safe and sanitary conditions or from prohibiting rain water systems.

1501.3 Definition

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The following terms shall have the meaning shown herein.

CONDENSATE. Condensed water collected from the surfaces of an air conditioning unit's evaporator coils or a dehumidifier unit's evaporator coils.

RAIN WATER. Water collected from runoff of roofs or other structures after a rain event. Rain water may also include condensate

1501.4 Permits.

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Check with the local Authority Having Jurisdiction for permit requirements.

1501.5 Installation.

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In addition to the provisions of Section 1501, systems for flushing of water closets, flushing of urinals, and cooling tower make up water shall comply with Section 1502. Except as provided for in this Chapter, all systems shall comply with the provisions of the International Plumbing Code.

1501.6 Materials.

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Above-ground drain, waste and vent piping for rain water systems shall conform to one of the standards listed in Table 702.1. Rain water underground building drainage and vent pipe shall conform to one of the standards listed in Table 702.2.

1501.7 Tests.

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Drain, waste and vent piping for rain water systems shall be tested in accordance with Section 312.

1501.8 Inspections.

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Check with the local Authority Having Jurisdiction for inspection requirements.

1501.9 Potable Water Connections.

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Only connections in accordance with Section 1502.2 shall be made between a rain water harvesting system and a potable water system.

1501.10 Collection Reservoir

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Rain water shall be collected in an approved reservoir constructed of durable, nonabsorbent and corrosion-resistant materials. The reservoir shall be a closed vessel. Access openings shall be provided to allow inspection and cleaning of the reservoir interior.

1501.10.1 Collection Reservoir Bypass

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A full open valve shall be installed prior to the collection reservoir to allow rain water to discharge directly to the normal storm water drainage system during maintenance of the rain water system.

1501.11 Filtration.

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Rain water shall pass through an approved filter system prior to distribution.

1501.12 Overflow.

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The overflow pipe discharge shall indirectly flow to the normal storm water drainage system and shall be sized equal to or larger than the influent pipe.

1501.13 Drain.

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A method for draining the collection reservoir shall be provided and shall not be connected to the sanitary drainage.

1501.14 Venting Required.

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The reservoir shall be provided with venting to allow for the induction and release of air to allow for the proper operation of the reservoir.

Section 1502 Systems for Flushing Water Closets and Urinals

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1502.1 Disinfection.

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Rain water shall be disinfected by an approved method that employs one or more disinfectants, such as chlorine, iodine, ozone, UV, or other approved disinfectants.

1502.2 Makeup Water.

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Potable water shall be supplied as a source of makeup water for the rain water system. The potable water supply shall be protected against backflow by the installation of an air gap device or in accordance with Section 608. There shall be a full-open valve and a water level control valve located on the makeup water supply line to the collection reservoir.

1502.3 Materials.

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Distribution piping shall conform to one of the standards listed in Table 605.4.

1502.4 Identification.

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Distribution plumbing fixtures and reservoirs shall be identified as containing non-potable water. Piping shall be purple and identified in accordance with Section 608.8.

(Effective January 1, 2014)
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