Utility Color Coding

Revised 10 2016

In response to a recent call to 811, you see that a locator has painted lines of different colors

and has inserted matching flags to represent underground utilities. But what do all of those

colors represent? Here is a summary:

 Red – electric power lines, cables, conduit, and lighting cables.

 Yellow – natural gas, oil, steam, petroleum, or gaseous materials.

 Orange - communications, alarm/signal lines, cables, or conduit.

 Blue – potable water lines.

 Purple – reclaimed water, irrigation, and slurry lines.

 Green – sewer lines.

 White – areas of proposed excavation.

Remember to dig with care. Utility lines cannot be exactly pinpointed and the depth cannot be

precisely determined. Please use extreme care when digging anywhere near the markings.

Also, if the lines and/or flags are disturbed, call 811 to have the utilities located again for free.