Why do I have colored markings and flags in my yard?
Utility Marking Colors and Their Meanings
Overview
Utility companies and contractors use a standardized color-coding system to mark underground utilities before any digging or construction work begins. These markings help prevent dangerous accidents, costly repairs, and service interruptions by clearly showing what is buried underground.
Before starting any digging project, always call 811. This free service sends utility professionals to mark underground lines so you can dig safely.
Why Calling 811 Is Important
-
Calling 811 is free and required by law in many areas
-
Utility lines are marked before you dig
-
It helps prevent injuries, property damage, and service outages
-
It protects workers, homeowners, and the community
Understanding the Color-Coded Utility Markings
Utility flags or paint markings help keep digging areas safe. Each color shows a different type of underground utility. Knowing what the colors mean helps homeowners, builders, and contractors avoid hazards and plan their work safely.
Color meanings include:
- White – Proposed excavation
- Pink – Temporary survey markings
- Blue – Potable (drinking) water
- Green – Sewer and drain lines
- Purple – Reclaimed water or irrigation slurry
- Red – Electrical power lines
- Yellow – Gas, oil, steam, or other flammable materials
- Orange – Communications, alarm, or signal lines
Dig Safely
Understanding utility markings and calling 811 before you dig helps make every project safer and prevents accidents before they happen.
See the image below for utility marking colors:
For additional information view the Texas 811 website.