Call 811 before You Dig
Know the Utility Marker Colors Before You Dig
Planning a landscaping project, fence installation, deck, mailbox, or even planting a tree? Before you dig, it is important to know what may be buried underground.
Professional utility locators use a universal, color-coded system of flags and spray paint to mark underground utilities and help prevent damage to vital services. These colors follow standards established by the American Public Works Association (APWA) and identify the type of utility located underground.
Utility Marker Color Guide
White — Proposed Excavation
Marks the exact area where digging or excavation is planned.
Red — Electric Power Lines, Cables, and Lighting Cables
Yellow — Gas, Oil, Petroleum, or Steam
Orange — Communication, Cable TV, Internet, and Signal Lines
Blue — Potable Water
Green — Sewers and Drain Lines
Purple — Reclaimed Water, Irrigation, and Slurry Lines
Pink — Temporary Survey Markings
Why Calling 811 Matters
Underground utility lines are often much closer to the surface than many people realize. Accidentally striking a buried electric, gas, water, or communication line can cause serious injury, costly repairs, and service interruptions for you and your neighbors.
That is why Minnesota law requires contacting 811 before starting any digging project.
By calling 811 or submitting a request online, professional locators will come to your property and mark underground utilities at no cost to you. This simple step helps protect your family, your property, utility workers, and the community.
Leave the Flags in Place
Once utilities have been marked, it is important to leave all flags and paint markings in place until your project is fully complete. Removing or disturbing the markings can create safety hazards and increase the risk of hitting underground lines.
Contact Gopher State One Call
In Minnesota, property locates are coordinated through Gopher State One Call.
Before any digging project, contact 811 or visit:
You can also learn more about utility markings and what the flags and paint in your yard mean here:
Why Are There Flags and Paint in My Yard?
Safe digging starts with a simple call to 811.