APWA Color Code

APWA Uniform Color Code for Marking Underground Facilities

Underground facilities shall be marked in accordance with the following designated color code:

White

White: Pre-marking of the outer limits of the proposed excavation or marking the centerline and width of proposed lineal installations of buried facilities.

Pink

Pink: Temporary survey markings.

Red

Red: Electric power lines, cables or conduit, and lighting cables.

Yellow

Yellow: Gas, oil, steam, petroleum, or gaseous materials.

Orange

Orange: Communication, alarm or signal lines, cables or conduits, and fiber.

Blue

Blue: Potable water.

Purple

Purple: Slurry, irrigation and reclaimed water.

Green

Green: Sewers, drainage facilities or other drain lines.

Permanently Marking Underground Facilities

The following recommendations shall be followed when permanently marking underground facilities:

  1. Markers must be clearly visible.
  2. Marker material shall be durable in nature. (treated wood, metal, UV-resistant plastics, etc.)
  3. Mark culverts if not readily visible. Mark both ends of all non-visible underground facilities.
  4. Identify type of underground facility if not recognizable from the surface.
  5. It is also recommended that your state’s call center number appear on the marker if the marker is of sufficient size.