Call 811 Before You Dig: What Tennessee Requires for Fence Posts

Nobody likes the 811 wait. You have a crew booked, a fence picked out, and the state wants you to sit three working days before a shovel touches the ground. I get it. But Tennessee 811 says fence holes go in areas likely to contain underground lines, and the call is free.

This is the full explainer. Who has to call, how the timing works, what the paint colors mean, and the part most homeowners never hear about: the lines on your own side of the meter that 811 will not mark at all.

Why a Fence Counts as Digging

People hear "call before you dig" and picture a backhoe. Tennessee 811 does not draw the line there. Its own list of excavation includes hand digging, augering, boring, and cultivating. A post hole dug with a clamshell digger is excavation. So is one drilled with an auger on the back of a skid steer.

On the "when to call" page, Tennessee 811 puts fence installation in plain words: it always requires a call. The reason it gives is location: a fence means digging multiple holes in areas likely to contain underground utility lines, and it names streets, rights-of-way, and property lines as examples. Tennessee 811 also says utility companies often bury lines along existing property lines.

The Sequence, Start to Finish

What the Paint Colors Mean

When the locators come, they spray paint or set flags in a standard color code. It helps to know it before you walk the yard:

• White: the proposed dig area, marked by whoever is excavating.
• Pink: temporary survey marks.
• Red: electric.
• Yellow: gas and oil.
• Orange: communications lines.
• Blue: potable (drinking) water.
• Purple: reclaimed water and irrigation.
• Green: sewer and drain lines.

If a fence line has a red or yellow mark running along it, that is a conversation to have before the holes are laid out, not after. Moving a post a foot or two is cheap. Hitting a line is not.

What the Marks Do and Do Not Tell You

The marks show roughly where a line runs. They do not show how deep it is, and the utilities are not required to tell you depth. Tennessee 811 calls locating "not an exact science" on its own homeowner page.

The state works with a safety zone around each mark: the width of the buried line plus two feet on each side. Inside that band, the careful way to find the real position of a line is to expose it, carefully, rather than punching a hole through it. Tennessee 811 says exposing the line is the best way to pinpoint it.

So a mark is not a guarantee that the hole two inches outside it is safe. It is a starting point. A post that lands inside the safety zone deserves slower digging and sometimes a shift in the layout.

The Lines 811 Will Not Mark

This is the one that catches people. Utilities mark the lines they installed and maintain. Tennessee 811 says facility operators may not locate or mark private underground facilities, meaning lines you own. Its FAQ lists these as private lines:

• Water services between the meter and the house or building.
• Sewer laterals that connect a house or building to a sewer main.
• Sprinkler system and irrigation lines.
• Propane lines from the tank to a house or building, or between buildings on a property.
• Alarm, security, or other communication lines buried between buildings on a property.
• Electric and gas lines that continue beyond a meter to grills, lights, or outbuildings.

Anything else you or a previous owner buried, such as a landscape lighting run or a pet containment wire, is not a utility's line either, so do not expect it in the paint. Tennessee 811 says a private locator may be able to help find and mark private lines. It also says 811 cannot contact one for you. Hiring one is separate from the free 811 call. If you have a plan of your own system, use it, and keep posts away from where you know the heads and pipes run.

If You Hit a Line Anyway

It happens. If a post hole turns up a pipe, a wire, or a cable, stop digging. Do not cover it back up, and do not try to fix it yourself. Tennessee law has you notify the utility operator immediately of the location and nature of the damage, and give the operator time to make repairs before work continues near the line.

If gas or another hazardous liquid escapes, the same statute adds that police and fire departments are to be notified right away. As general safety practice, get away from the hole first and make the calls from a safe distance. Then tell the fence contractor what happened before anybody sets another post.

Where This Fits in a Fence Job

The locate window is part of your schedule whether the estimate mentions it or not. Three working days at minimum, plus the weather. On a job with a permit step, the two can run side by side. The permits and rules guide covers the City of Jackson and Madison County side, and what to do before your fence crew arrives lists the rest of the prep. When you read a bid, how to read a fence estimate shows where the 811 responsibility should be written down. For the timeline as a whole, see how long fence installation takes.

It also changes the order of things around the property line. A locate does not tell you where your boundary is, and a utility mark does not mean the land is yours to dig. If the line itself is in question, sort that out with a survey before the holes go in, and read the property line disputes guide if a neighbor is involved.

If you want help with the timing on a new fence, see fence installation or the page for your town, such as fence installation in Jackson.

Common Questions About 811 and Fences

The Honest Bottom Line

Call, wait, compare the marks to the ticket, keep every post out of the safety zone or dig it slowly, and remember the private lines are on you. That is the whole job. It adds a few days to a fence schedule and takes a lot of risk off it.

If you want a fence and want the 811 call written down as somebody's job, get in touch for a free written estimate and ask who calls.

More plain-English answers on cost, permits, materials, and repairs are in all of our fence guides.