What are the American Publick Works Association (APWA) Uniform Color Codes?

The American Public Works Association (APWA) has established a standardized system of color codes for the temporary marking of underground utilities throughout the United States. This system ensures consistent and clear communication to prevent damage during excavation activities. Here’s a detailed breakdown of these color codes:

• Red: Designated for marking electric power lines, cables, conduit, and lighting cables.
• Orange: Used to identify telecommunication lines, including alarm or signal lines, as well as cables or conduit.
• Yellow: Indicates the presence of natural gas, oil, steam, petroleum, or other gaseous and flammable materials.
• Green: Represents sewer and drain lines.
• Blue: Marks drinking water sources to alert operators of safe water supply lines.
• Purple: Signals reclaimed water lines, including irrigation and slurry systems.
• Pink: Used for temporary survey markings or to mark unknown or unidentified facilities.
• White: Outlines the proposed excavation limits or routes, guiding the planned work area.