Know what you are digging on

Utility colour codes are used for identifying existing underground utilities in construction areas with the intent of protecting them from damage during excavation. Coloured lines, flags or stakes are used to mark the location and denote the type of underground utility. The following table identifies the Uniform Colour Codes for temporary marking of underground utilities. 

Red

electric power lines, cables, conduit, and lighting cables

Orange

telecommunication, alarm or signal lines, cables, or conduit

Yellow

natural gas, oil, steam, petroleum, or other gaseous or flammable material

Green

sewers and drain lines

Blue

potable drinking water

Violet

reclaimed water, irrigation, and slurry lines

Pink

temporary survey markings, unknown/unidentified facilities

White

proposed excavation limits or route

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