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  • CHAPTER29
    WATER SUPPLY AND DISTRIBUTION  

    User note: Code change proposals to this chapter will be considered by the IRC – Plumbing and Mechanical Code
    Development Committee during the 2015 (Group A) Code Development Cycle. See explanation on page iv.

    SECTIONP2901
    GENERAL  

    P2901.1 Potable water required.

    Potable water shall be supplied to plumbing fixtures and plumbing appliances except where treated rainwater, treated gray water or municipal reclaimed water is supplied to water closets, urinals and trap primers. The requirements of this section shall not be construed to require signage for water closets and urinals.

    P2901.2 Identification of nonpotable water systems.

    Where nonpotable water systems are installed, the piping conveying the nonpotable water shall be identified either by color marking, metal tags or tape in accordance with Sections P2901.2.1 through P2901.2.2.3.

    P2901.2.1 Signage required.

    Nonpotable water outlets such as hose connections, open-ended pipes and faucets shall be identified with signage that reads as follows: “Nonpotable water is utilized for [application name]. CAUTION: NONPOTABLE WATER. DO NOT DRINK.” The words shall be legibly and indelibly printed on a tag or sign constructed of corrosion-resistant water-proof material or shall be indelibly printed on the fixture. The letters of the words shall be not less than 0.5 inches (12.7 mm) in height and in colors in contrast to the background on which they are applied. In addition to the required wordage, the pictograph shown in Figure P2901.2.1 shall appear on the required signage.

    FIGURE P2901.2.1 PICTOGRAPH—DO NOT DRINK

    FIGURE P2901.2.1

    PICTOGRAPH—DO NOT DRINK

    P2901.2.2 Distribution pipe labeling and marking.

    Nonpotable distribution piping shall be purple in color and shall be embossed or integrally stamped or marked with the words: “CAUTION: NONPOTABLE WATER— DO NOT DRINK” or the piping shall be installed with a purple identification tape or wrap. Pipe identification shall include the contents of the piping system and an arrow indicating the direction of flow. Hazardous piping systems shall contain information addressing the nature of the hazard. Pipe identification shall be repeated at intervals not exceeding 25 feet (7620 mm) and at each point where the piping passes through a wall, floor or roof. Lettering shall be readily observable within the room or space where the piping is located.

    P2901.2.2.1Color.

    The color of the pipe identification shall be discernable and consistent throughout the building. The color purple shall be used to identify reclaimed, rain and gray water distribution systems.

    P2901.2.2.2Lettering size.

    The size of the background color field and lettering shall comply with Table P2901.2.2.2.

    TABLE P2901.2.2.2

    SIZE OF PIPE IDENTIFICATION

    PIPE DIAMETER (inches)LENGTH OF BACKGROUND COLOR FIELD (inches)SIZE OF LETTERS (inches)
    3/4 to 11/480.5
    11/2 to 280.75
    21/2 to 6121.25
    8 to 1022.5
    over 10323.5

    For SI: 1 inch = 25.4 mm.

    P2901.2.2.3Identification Tape.

    Where used, identification tape shall be not less than 3 inches (76 mm) wide and have white or black lettering on a purple field stating “CAUTION: NONPOTABLE WATER—DO NOT DRINK.” Identification tape shall be installed on top of nonpotable rainwater distribution pipes and fastened not greater than every 10 feet (3048 mm) to each pipe length, and run continuously the entire length of the pipe.