Montana One Call Center

1-800-551-UDIG (8344) or 406-755-UDIG or 811 [email protected]

Understanding Color Markings

All utilities mark their buried facilities in accordance with the American Public Works Association (APWA)uniform color codes.

Red: Electric power lines, cables, conduit and lighting cables
Yellow: Gas, oil, steam, petroleum or gaseous materials
Orange: Communication, alarm or signal lines, cables or conduit
Blue: Potable water
Purple: Reclaimed water, irrigation and slurry lines
Green: Sewers and drain lines
Pink: Temporary survey markings
White: Proposed excavating