Section 890.1120  Color Code

Identification of piping.  All piping conveying non-potable water shall be permanently identified by a distinctive yellow-colored paint so that such piping is readily distinguishable from piping carrying potable water.  (See USAZ 253.1-1953 Safety Color Code for Marking Physical Hazards and USA AB.1-1956 Scheme for the Identification of Piping Systems.)