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Uniform Color Code

The uniform color code is used for marking excavation sites and underground facilities in conflict with an excavation. 

Underground facilities may be marked on the ground in either paint, stakes, or flags.

White

Proposed Excavation

Pink

Temporary Survey Markings

Red

Electric 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

Tolerance or Safety Zone

Tennessee state law requires excavators to exercise reasonable care when working inside the tolerance or safety zone. The tolerance zone is the width of the buried facility plus two (2) feet (or 24 inches) on each side.