APWA Uniform Color Code
Marking Underground Utility Lines
The APWA, American Public Works Association, developed a color code for temporality marking underground facilities prior to an excavation. The color code encourages all excavators, surveyors and engineers to use the colors to promote and eliminate damages to workers, general public and prevent service interruptions to vital underground utilities.
Marking underground utilities with paint, flags, surface markers and underground marking tapes allows all excavators to understand the types and the approximate locations and routes of buried lines.
