Underground Utility Markers

Using utility marker posts to identify underground utility lines helps prevent excavation accidents that lead to deaths, injuries, service interruptions, environmental damage and liability.

Our sturdy utility line markers and reflective number kits make it easy to identify buried utilities. These posts can also be used for 9-1-1 emergency markers, to mark trails or campsites, or anywhere else a strong, flexible marking post is needed.

Need something else? Browse: All Utility Signs, Buried Cable, Gas Pipeline, Water Pipeline, Waste / Sewer / Sludge, Utility Marker Posts.

Browse Colorful Utility Marking Posts.

6 Utility Marking Posts in Varied Colors

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Colored Utility Marking Posts are Required


The American Public Works Association (APWA)/Utility Location and Coordination Council (ULCC) color code is a universal marking guide for underground facilities used in construction and engineering projects. The code helps prevent damage, accidents, and service interruptions for contractors, excavators, and others working near underground facilities.

What Do Utility Marker Colors Mean?


Locators use the APWA Uniform color code to mark underground facilities. Each color used represents a different type of utility:

Blue: Potable water

Green: Sewers, drainage facilities or other drain lines

Orange: Communication, alarm or signal lines, cables or conduits, and fiber

Pink: Temporary Survey Markings

Purple: Slurry, irrigation and reclaimed water

Red: Electric power lines, cables or conduit, and lighting cables

White: Pre-marking of the outer limits of the proposed excavation or marking the centerline and width of proposed lineal installations of buried facilities

Yellow: Gas, oil, steam, petroleum, or gaseous materials

Permanently Marking Underground Facilities:

The following recommendations shall be followed when permanently marking underground facilities:
- Markers must be clearly visible
- Marker material shall be durable in nature. (Treated Wood, Metallic, UV Resistant Plastics, etc.)
- Mark culverts if not readily visible. Mark both ends of all non-visible underground facilities
- Identify type of underground facility if not recognizable from the surface

Utility Marking Resources:


Learn about your state specific utility marking processes and laws

Annual DIRT Report analysis of damages to buried infrastructure

Best Practives Guide for damage prevention and safety

Locator White Paper with insights into improving utility locating

APWA Resource Center