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608.8 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 608.8.1 through 608.8.2.3.
608.8.1 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 waterproof material or shall be indelibly printed on the fixture. The letters of the words shall be not less than 0.5 inch (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 608.8.1 shall appear on the required signage.
608.8.2 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 also 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.
608.8.2.1 Color.
The color of the pipe identification shall be discernable and consistent throughout the building. The color purple shall be used to identify nonpotable water distribution systems.
608.8.2.2 Lettering size.
Pipe Diameter (inches) | Length Background Color Field (inches) | Size of Letters (inches) |
3/4 to 1 1/4 | 8 | 0.5 |
1 1/2 to 2 | 8 | 0.75 |
2 1/2 to 6 | 12 | 1.25 |
8 to 10 | 24 | 2.5 |
over 10 | 32 | 3.5 |
For SI: 1 inch = 25.4 mm.
608.8.2.3 Identification tape.
Where used, identification tape shall be at least 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 water distribution pipes, fastened at least every 10 feet (3048 mm) to each pipe length and run continuously the entire length of the pipe.
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