Call 811 Before You Dig: How It Works and Why It Matters
Resource guide | 6 min read

Call 811 Before You Dig: How It Works and Why It Matters

What 811 is, who has to call, how long marking takes, what the paint colors mean and what to do if a line is hit.

What 811 does

811 connects you to the one-call center for your state. You tell them where you plan to dig, and they notify the utilities that have lines in the area. Each sends a locator to mark its buried lines with paint or flags.

Who must call

Anyone who digs should call, from a homeowner planting a tree to a contractor trenching a street. Even a small hole for a fence post can hit a shallow line. State rules require excavators to call, and common sense says the same to everyone.

Timing

Calling too late is the most common mistake. Marking takes several working days, and the marks have a limited life. Check the current waiting time and the ticket length when you call.

What the colors mean

Red marks electric, yellow gas, orange communications, blue water, green sewer and drain, pink survey marks and white proposed excavation. Colors help you know what a line is, not exactly how deep it runs.

What is not marked

Public utilities mark their lines up to the meter. Private lines, such as irrigation, lighting, gas to a grill and power to outbuildings, are the owner responsibility. A private locating service can find them.

If you hit a line

Stop work. For gas or electric, leave the area and call emergency services and the utility. For water, shut off the water if you can do so safely and call. Never try to fix a damaged line yourself.

Our advice in one sentence

Call 811, wait for the marks, hand dig near them and call us to pothole when you are unsure.

Questions

Quick answers.

Is calling 811 free?

Yes. The service and the public marking are free to the caller.

Do marks show depth?

No. They show the approximate path. Potholing shows depth.

What if a utility does not mark my site?

Contact the one-call center again and report it before digging.

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