What color should piping containing reclaimed water be?

Piping that contains reclaimed water is typically marked with the color purple. This color standard is established to help prevent cross-contamination with potable (drinking) water supplies and to ensure that the reclaimed water is easily identifiable. The use of purple piping serves an essential function in promoting public safety and awareness among operators and the general public.

This color coding is part of a broader initiative to standardize labeling across water supply systems. Recognizing purple piping helps workers and consumers alike understand that the water within it is not suitable for drinking, highlighting its intended use for irrigation, industrial applications, or other non-potable purposes. By following this color-coding system, it minimizes the risk of accidental misuse and enhances overall system management.

Piping marked in other colors typically corresponds to different types of water or uses—for example, green is often used for reclaimed water in some regions, and red is generally reserved for fire protection systems. Blue typically indicates potable water. Each of these colors has its standard association that helps maintain the integrity and safety of various types of water distribution.