Scout's Toolbox Talks

Underground Utility Detection

Toolbox Talk:

Know the Utility Color Codes

June 22, 2025

Utility markings follow a national color code system. Every worker should recognize and understand what each color means.

Why It Matters:

Misreading a color marking could mean cutting into a live electric line, hitting a gas main, or flooding the site. Recognizing the color code helps prevent accidents before they happen.

Key Points:

  • Red = Electric power lines, cables, conduit
  • Yellow = Gas, oil, steam, petroleum
  • Blue = Potable water
  • Orange = Communications, alarm or signal lines
  • Green = Sewer and drain lines
  • Purple = Reclaimed water, irrigation, slurry
  • Pink = Temporary survey markings
  • White = Proposed excavation

✅ Color knowledge = hazard awareness. Don’t guess — know what you’re digging near.

Ask the Crew:

  • Can everyone identify the color codes on site?
  • Are any markings unclear or missing?
  • Should we post a color-code chart near the work zone?