Frequently Asked Questions

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What do the different utility flag colors mean?

APWA Uniform Color Code for Marking Underground Utility Lines
White	Proposed excavation
Pink	Temporary survey markings
Red	Electrical power lines, cables, conduit and lighting cables
Yellow	Gas, oil, steam, petroleum or gaseous materials
Orange	Communications, alarm or signal lines, cables or conduit
Blue	Potable water
Purple	Reclaimed water, irrigation and slurry lines
Green	Sewers and drain lines