Those Little Flags in Your Yard?
They’re Protecting Your Neighborhood

What utility markings mean, why they matter, and what happens when you call 811

A Yard Full of Flags — and No Explanation

If you’ve had an “Alex moment,” you’re not alone. Brightly colored flags and painted markings appear in yards and along streets all the time, often with no obvious explanation for residents. But those markings aren’t random, and they aren’t a mistake. They’re part of a carefully coordinated system designed to keep workers, homeowners, and entire communities safe.

Underground, Out of Sight — Until Something Goes Wrong

Beneath every lawn, sidewalk, and road lies a hidden web of infrastructure: electric lines, gas mains, water pipes, sewer lines, and communication cables. Most of us never think about them until a contractor’s shovel hits one and the lights go out, a gas line ruptures, or a neighborhood loses water service for a day.

That’s where the color-coded marking system comes in. Each color corresponds to a specific type of utility, creating a visual map of what’s buried and where. Together, they give anyone planning to dig a fighting chance to avoid the lines that power, heat, and connect the community.

Quick Color Reference

Want a handy printable version? Download the Color Reference Card to keep on the job site or tuck in a project folder.

So, Who Put Those Flags There?

In Connecticut, the process starts with a single call or a click. CBYD, also known nationally as 811, is the state’s notification center for planned excavation. When anyone submits a request before digging, whether it’s a homeowner planting a tree or a contractor starting a new build, CBYD notifies every utility company that may have underground lines in the area.

Those utility companies then dispatch trained locators, who physically visit the site and mark the approximate location of their underground lines using the standardized color system. That’s the crew Alex saw in the yard. They weren’t trespassing. They were doing their jobs, quietly protecting the neighborhood.

What CBYD Is — and What It Isn’t

It’s worth being clear: CBYD is not an emergency service, and it does not physically mark lines itself. It is a coordination hub for planned digging and a prevention program to keep you and what’s underground safe.

If you see a downed power line, smell gas, or have a utility emergency, don’t call 811. Call your utility provider directly or dial 911 if there is immediate danger. CBYD cannot help with those situations.

For everything planned, such as a fence post, a garden bed, or a pool installation, CBYD is exactly who you want in your corner before the shovel goes in the ground.

Why It All Matters

Back to Alex: the flags in the yard appeared because a contractor down the street had filed a CBYD ticket before starting a drainage project. The utility locators marked the entire affected zone, including Alex’s lawn, to ensure no one accidentally cut into the neighborhood’s gas or water service during the work.

What felt like an intrusion was actually a sign that the system was working exactly as it should. The markings disappeared within days, the project was completed without incident, and the neighborhood never lost power or water. Nobody made the evening news.

Those simple colored lines, easy to overlook and easy to misread, are the difference between a routine project and a very bad day. Whether you’re a homeowner picking up a shovel or a contractor running a crew, a moment spent understanding the markings can prevent outages, costly repairs, and real injuries.

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For informational purposes only. Always contact CBYD / 811 before any excavation project in Connecticut.