What Is a Utility Locate (811)?
A utility locate is the process of marking buried utility lines before digging. Learn how 811 locates protect crews during fiber construction projects.
A utility locate is the process of identifying and marking the location of underground utility lines, such as fiber, electric, gas, and water, before excavation begins. In the United States, contractors request locates by calling 811 or filing an online ticket, and utility owners mark their buried lines with paint or flags so crews can dig safely.
How an 811 Locate Request Works
Anyone planning to dig, whether a homeowner or a fiber construction crew, contacts 811 or the state one-call center at least a few business days before work starts. The request goes out to every utility company with lines in that area: power, gas, water, sewer, cable, and fiber. Each utility then sends a locate technician to mark the approximate path of its buried lines with paint, flags, or both. Once all affected utilities have responded, the ticket is considered clear and excavation can proceed. Locate tickets typically expire after a set number of days, so crews on longer fiber builds often need to renew them as work progresses.
Standard Locate Marking Colors
Utility locators use a uniform color code so crews can read markings the same way anywhere in the country. Red marks electric power lines and cables. Yellow marks gas, oil, and other flammable lines. Orange marks communication lines, including fiber and telecom conduit. Blue marks potable water. Green marks sewer and drain lines. Purple marks reclaimed water or irrigation lines. White marks the proposed excavation route itself, sometimes called pre-marking. Crews on Fiber Construction Company projects treat every marked color as a hard boundary, not a suggestion, since a single strike can cut service to an entire neighborhood or business district.
Why Locates Matter on Fiber Builds
Fiber networks go in mostly underground, through directional boring, trenching, or plowing, all of which put crews in direct contact with existing utilities. A confirmed locate protects the new fiber route and every utility already in the ground, including gas and electric lines where a strike can cause injury or a costly outage. Skipping or rushing the locate process is one of the most common causes of delays and change orders on underground builds. Fiber Construction Company treats a clear locate ticket as a hard requirement before any crew breaks ground, not just a compliance checkbox.
Utility Locate (811), answered
What Is a Utility Locate (811)?
A utility locate is the process of identifying and marking the location of underground utility lines, such as fiber, electric, gas, and water, before excavation begins. In the United States, contractors request locates by calling 811 or filing an online ticket, and utility owners mark their buried lines with paint or flags so crews can dig safely.
Is calling 811 free?
Yes. Requesting a locate through 811 or a state one-call center is free. The utility owners cover the cost of sending locate technicians as part of normal operations.
How long does a locate take to come back?
Most states require utilities to respond within a few business days of a valid request, though exact timelines vary by state law. Complex sites or slow-responding utilities can push that out, which is why experienced crews build locate lead time into the project schedule.
What happens if a crew hits a line anyway?
A locate only marks approximate location, not exact depth or path, so crews still dig with caution near marks. If a line is damaged, standard practice is to stop work immediately, secure the area, and notify the utility owner and one-call center right away.