Best Practices Version 17.0

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Uniform Color Code

BEST PRACTICES CHAPTER 4 - LOCATING AND MARKING

Practice Statement 4-3:

Color Code: A uniform color code and set of marking symbols is adopted nation wide.

The following APWA uniform color code (ANSI Z535.1) shall be adopted as the uniform color code for marking excavation sites and underground facilities in conflict with an excavation. This recommendation is not intended to preempt any existing state requirement that specifies other colors.9

References:

  • APWA Uniform Color Code
  • Existing operating practices from various states’ one call centers
  • Existing one call laws from various states
  • ANSI Standard Z535.1 Safety Color Code

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