Understand Locator Marks Dig Safely Home< BackNext >


Utility locator marks protect you.
Make sure you and your crews understand how to read utility locator marks and know the American Public Works Association (APWA) uniform color code for marking underground utilities. Color code charts are usually available from your local 811 center.

Locator flags are placed within paint marks.
If you find flags outside the borders of locator marks, someone may have tampered with them. Contact 811.

Maintain the marks.
You are responsible for maintaining locator marks until your excavation is complete. Document marks with photos or video before you dig. If marks fade or are destroyed, stop work and notify 811 so the area can be located and marked again.


APWA Color Codes:
Electric power lines
Gas, oil, or steam
Communication lines, cables, or conduit
Potable water
Reclaimed water, irrigation, and slurry lines
Sewer and drain lines
Temporary survey markings
Proposed excavation


Utility locator marks protect you from injury and prevent damage to underground utilities. Make sure you and your crews understand them.