American Public Works Association color code for locator marks

Underground utility lines are marked with flags and/or paint in accordance with the color code below.

Red	Electric power lines
Pink	Temporary survey markings
White	Proposed excavation
Yellow	Gas, oil or steam
Blue	Potable water
Green	Sewers and drain lines
Orange	Communications lines, cables or conduit
Purple	Reclaimed water, irrigation and slurry lines

Facility markings show you only the approximate location of buried utility lines. Before you can safely work near a gas or electric line, you must first hand dig to expose the line and visually verify its exact location and depth. If you cannot visually verify the location of a marked utility line, STOP digging and call 811 immediately.