What Pennsylvania 811 Requires Before You Dig

There is a widespread belief that calling before you dig is a contractor formality. It is not. It is a legal duty under the Pennsylvania Underground Utility Line Protection Law, Act 287 of 1974 as amended by Act 50 of 2017, and it reaches homeowners as well as the trade.

It applies to you too

If you plan to disturb the earth with powered equipment, the obligation to notify is yours. Renting a mini excavator for a weekend project does not put you outside the law, and neither does the work being on your own property.

That is the part people are surprised by. The line running under your yard is not necessarily yours, and even where it is, hitting a gas line or a fiber run has consequences that do not care whose grass it was under.

Three business days

Notice has to be given at least three business days ahead. Business days exclude weekends and legal holidays, so a request made Friday afternoon does not clear until the following Wednesday. Plan accordingly, particularly around holidays, when the wait stretches without warning.

You can call 811 or submit the request online. There is no charge to you for a locate request.

What gets marked

Once the request goes in, the utilities with buried plant in the area send locators to mark their own lines on the surface. The marks are color-coded by utility type, and they tell you where something is buried, not how deep.

That last part catches people out. A mark is a horizontal position. Depth varies with grade changes, previous work and settlement, so the marks are a warning to dig carefully rather than a license to dig confidently.

What does not get marked

This is the important gap. Locators mark the utility’s own lines up to the point where ownership transfers, which is usually at or near the property line or the meter. Everything beyond that on your side is a private line and nobody is coming to mark it.

So on a typical property the water service from the curb stop to the house, the sewer lateral, the line to a detached garage, the gas run to a pool heater, sprinkler piping and low-voltage lighting cable are all invisible to an 811 request. If you want those located, that is private locating and you arrange it.

The plumbing jobs this catches

Several of the jobs people take on themselves land squarely inside this:

• Digging to expose a leaking water service line
• Putting in a French drain or a downspout run near where the sewer lateral leaves the house
• Setting fence posts along a boundary, which is where service lines frequently run
• Landscaping or regrading over a septic or lateral run
• Anything involving a stump grinder near the street

For our own work, notice goes in before excavation and we wait out the clock. On a sewer line replacement the marks also shape the dig, because they determine whether the run can be pulled trenchlessly or has to be opened up, and that changes the price. It is not a box-ticking step and it is not one worth skipping to save three days.