American Public Works Association Uniform Color Code

RED

Electric power lines, cables or conduits, and lighting cables.

YELLOW

Gas, oil, steam, petroleum or other hazardous liquid or gaseous materials.

ORANGE

Communications, cable TV, alarm or signal lines, cables, or conduits.

BLUE

Water, irrigation, and slurry lines.

GREEN

Sewers, storm sewer facilities, or other drain lines.

WHITE

Proposed excavation

PINK

Temporary survey markings.

PURPLE

Reclaimed water, irrigation and slurry lines.