The American Public Works Association (APWA) Uniform Color Codes for survey marker temporary marking of underground utilities:
Red | Electric Power Lines, Cables, Conduit, and Lighting Cables |
Orange | Communication, Alarm or Signal Lines, Cables, or Conduit |
Yellow | Gas, Oil, Steam, Petroleum, or Gaseous Material |
Green | Sewers and Drain Lines |
Blue | Potable Water |
White | Proposed Excavation Limits or Route |
Pink | Temporary Survey Markings, Unknown / Unidentified Facilities |
Purple | Reclaimed Water, Irrigation, and Slurry Lines |