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To locate underground gas lines before digging in the United States, call 811 or submit a request through your local one-call center, wait for the required response period, and make sure affected utilities have marked their facilities before work begins. The marks are a guide to utility locations—not a measurement of pipe depth—and local rules determine how close you may excavate and which methods you may use.
Do not probe the ground, rely on an old site plan, or try to find a gas pipe with a shovel. Arrange the locate first. If marks are missing or confusing, pause work and ask the one-call center or utility for clarification.
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What should I do before digging near a gas line?
Start with a locate request, not with a tool in the ground. In the U.S., calling 811 connects you to the local one-call center. That center notifies facility operators that may have buried infrastructure in the proposed work area, including natural gas pipeline operators. The operators determine whether their facilities may be affected and arrange for locating and marking. The service is free, but the excavator remains responsible for making the request, waiting, respecting the marks, and digging carefully, as PHMSA explains.
A request is not permission to dig immediately. Wait until the locally required response period has passed and all required facility responses and marks are accounted for. State and local rules differ, so use the timeline and instructions from your one-call center rather than assuming a national deadline. Do not start because you filed the request, because a date you expected has arrived, or because one operator has already responded.
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This process is for planning excavation safely; it is not a way to search for a pipe yourself. Surface pipeline markers, property records, and lines uncovered during earlier work cannot establish a buried pipe’s exact position or depth. A previous project may have exposed a utility at one location, but that does not tell you where it runs elsewhere or whether its depth has changed.
The safest sequence is straightforward: describe the full work area, submit the request, wait for the required responses, review the marks and ticket, check whether private facilities are covered, and excavate according to local rules. If one part of that sequence is incomplete or unclear, resolve it before breaking ground.
How do I request a gas-line locate?
- Define the full work area. Before contacting the one-call center, identify where excavation is planned and what kind of work you intend to do. Mark the proposed area as the local center requires, and describe the location and work accurately. The center uses that information to contact operators that may have facilities in the area. A vague or incomplete description can make it harder to determine which facilities may be affected, so be clear about the limits of the work rather than describing only a nearby landmark.
- Contact 811 or the local one-call center. Submit the request through the channel available in your area. Calling 811 routes you to the local center; follow its instructions if you are using an online or other request option. The center is a notification system: it forwards the information to potentially affected facility operators. It does not itself guarantee that every line on private property will be located or that every buried service is covered.
- Keep the ticket information. Record the request or ticket details and follow the instructions provided for the work area, response period, and next steps. The ticket helps you confirm what location and work were reported and gives you a reference if you need to ask about an unmarked facility or a response that has not arrived. If the work location or scope changes, contact the center to ask whether the existing request still covers it before proceeding.
- Wait for the required responses. Do not begin simply because the request was submitted, because the expected date has arrived, or because one utility has responded. Confirm that the applicable waiting period has elapsed and that the required operators have responded or marked their facilities. A missing response is a reason to contact the center and resolve the ticket, not a signal that no facility is present.
- Review the marks before work. Check which facilities are indicated and whether the marks cover the planned excavation area. Follow the instructions supplied by the one-call center and operators. If marks are absent, unclear, damaged, or inconsistent with your plan, stop and contact the center or operator for clarification or a remark. Do not interpret an unmarked area as proof that it is safe to dig until you have confirmed the request and responses are complete.
- Check for private facilities. Ask whether the public one-call request covers all lines in the work area. Customer-owned or privately installed lines may fall outside the request. If such lines could be present beyond the public locate coverage, arrange private locating as applicable. NIOSH’s buried-utilities safety guide advises arranging private locating when needed.
- Excavate under local rules. Follow the applicable tolerance-zone requirements and the methods permitted or directed by local authorities and facility operators. Use extra caution near marked facilities, and do not assume one state’s distance or excavation method applies elsewhere. A hand tool can be appropriate for careful exposure only where local requirements permit it; it is not a way to locate a pipe before the locate request.
These steps apply whether the job is a small yard project or a larger excavation. The size of the project does not make a surface guess more reliable, and the presence of a visible utility marker does not remove the need for a current request. Plan for the locate before scheduling the work so that the required response period and any needed private locating can be completed first.
How long do I have to wait after calling 811?
There is no single waiting period in the cited guidance that applies throughout the United States. PHMSA says state law specifies the operator response period, so the one-call center’s instructions for your jurisdiction control. The time to file the request and the time when excavation may begin are matters to verify for the specific location and ticket.
The examples below show why it is important to check locally. Southern California Gas advises requesting a locate at least two business days before digging. Columbia Gas of Pennsylvania cites three business days in its Pennsylvania guidance. Those are local examples, not interchangeable national deadlines. The relevant deadline is the one that applies to your location and request.
Do not convert a utility’s local advice into a nationwide rule. A homeowner in one state should not assume that the two-business-day advice from Southern California Gas applies to their job; someone working in Pennsylvania should not assume that the Pennsylvania example controls a project elsewhere. Check with the one-call center and follow the timeline it provides for that jurisdiction.
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Even after the expected time has passed, do not treat silence or an incomplete set of marks as a clear-to-dig signal. Confirm that required responses have arrived. If a utility has not responded, an area appears to have been missed, or you cannot tell whether the ticket is complete, ask the center how to resolve it before excavation. Waiting the right number of days does not replace checking that the required locating work has been done.
What do gas-line marks tell me—and what don’t they tell me?
Marks show the indicated location of utility facilities at the surface; they do not tell you how deep a gas pipe is or guarantee its precise position underground. PHMSA instructs excavators to respect utility marks, while utility guidance warns that actual location and depth can change because of erosion, later work, or uneven surfaces. A mark is important information for planning the work, but it is not a depth reading or a guarantee that a pipe lies at a uniform distance below the ground.
Do not use a marker post, an old property drawing, or a line exposed by a previous project as a substitute for a current locate. A marker may indicate a pipeline’s general presence without establishing its exact route at your excavation site. Records may be old, and prior exposure only tells you what was found at that particular point. Nor should you push a rod, stake, shovel, or other tool into the ground to test where a pipe might be. Guessing by probing can put a tool into a buried facility rather than identify it safely.
If a mark is difficult to interpret, has been disturbed, or does not appear to match the planned work, pause and ask the one-call center or utility to explain it or arrange a remark. Do not shift the excavation to an apparently clear spot unless the work area and locate information have been checked. If the scope changes, check whether the request still describes the work you intend to do.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsA locate request and its marks are part of a safe excavation process, not a guarantee that every buried service has been identified. Confirm the scope of the request, especially on private property, and follow the instructions supplied for the ticket and the facilities shown. Treat any uncertainty about what is marked as something to resolve before excavation, not as a reason to improvise.
What is a tolerance zone, and how should I dig near marked lines?
A tolerance zone is a locally defined area around a marked utility where special caution applies. Its dimensions and the acceptable excavation methods vary by jurisdiction. Check the rule that applies where you are working and the instructions for your ticket; do not take a measurement from guidance for another state and apply it automatically.
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For example, Texas811 describes a Texas tolerance zone using the pipeline diameter and a minimum of 18 inches on either side of the pipe’s outside edge. In other words, its description combines the pipe’s nominal diameter with a minimum distance measured outward from the pipe’s outside edge. Texas811 recommends hand tools or other acceptable methods in that zone to expose the precise location before more extensive excavation. In contrast, Southern California Gas advises using hand tools within 24 inches of marked utility lines. The two instructions reflect different local guidance; neither should be presented as a nationwide rule.
These examples are not a shortcut for deciding what to do at a site. A tolerance-zone definition may use a different reference point or measurement in another jurisdiction, and the acceptable method may also differ. Texas811 discusses hand digging, soft digging, vacuum excavation, and other methods, while noting that conditions matter. Check the ticket, local requirements, and operator instructions for what is permitted at your site. If instructions are unclear or appear to conflict, ask the center or operator before continuing.
When local rules require careful exposure near a marked line, the purpose is to establish the facility’s precise location before more extensive work proceeds. Do not assume that a particular hand tool is automatically acceptable everywhere or that using one makes the work safe by itself. A round-point shovel may be a task aid for careful exposure where local rules permit it, but it does not locate a gas pipe, show its depth, replace an 811 request, or guarantee safety. Never use a shovel to search for an unlocated line.
Before choosing an excavation method, confirm three things: where the local tolerance zone begins and ends, what methods are accepted there, and what the operator or ticket requires for the specific facility. Those details matter more than a general rule of thumb. The same method can be treated differently under different local requirements, so a technique allowed in one area should not be assumed acceptable at a different job.
Does 811 locate gas lines on private property?
Do not assume that one-call coverage includes every buried line serving a property. A public request notifies potentially affected facility operators, but customer-owned or privately installed services may fall outside the facilities covered by the request. Ask the local center what its ticket covers, then arrange private locating when needed.
This distinction matters on construction sites and other properties where lines may run from a utility-owned facility to a building or between privately installed equipment. The public request and a private locate are not interchangeable: first confirm what the one-call center has requested operators to mark, then identify any lines that may be outside that scope. If the planned excavation could reach a line that the public request does not cover, resolve that coverage gap before digging.
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NIOSH advises arranging a private utility locating service for private-property lines when applicable. A private locator is a service option, not a consumer gadget. The guidance here does not establish that a general-purpose electronic locator can detect every buried gas service, so do not use a consumer device as a substitute for 811, operator marking, or a needed private locate. Likewise, do not infer that a line is absent simply because the public marks do not show it.
Make the coverage question part of planning, particularly when the work is on a property with customer-owned facilities or privately installed services. If you are unsure whether a line is public or private, ask the one-call center, the utility, or a qualified private locator how to address it. Do not start until you know what the request covers and have dealt with any likely coverage gap.
What should I do if excavation damages a gas line?
Stop work, move away from the area, keep other people clear, and call 911 and the gas utility from a safe location. Do not remain near the damage to inspect it or try to repair it. If gas is suspected, prioritize getting people away and contacting emergency responders and the utility safely. Keep others from approaching the affected area while you make those calls.
Report damage to the pipeline operator promptly even if no leak is apparent or gas cannot be smelled. Federal excavator rules require prompt reporting of excavation damage whether or not a leak occurs. PHMSA’s excavator rule language says the excavator must report damage at the earliest practicable moment after discovering it. That duty is not limited to a visible leak; a strike or other damage still needs to be reported. Texas811 and NIOSH also direct people to move away and contact emergency services and the utility when a gas line is struck or a leak is suspected.
Do not delay reporting while trying to decide whether the damage is serious enough or whether gas is escaping. The safe response is to get clear, contact emergency responders and the gas utility from a safe place, and promptly notify the pipeline operator. Use the local emergency and utility contacts for the location; the precise reporting route can vary, but the need to report damage does not depend on whether anyone can smell gas.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why do local requirements matter?
The national starting point is consistent: request a locate, wait for the applicable responses and marks, and excavate carefully. The operational details are local. Lead time, the size and definition of the tolerance zone, accepted excavation methods, private-line coverage, and damage-reporting contacts can differ. PHMSA’s national guidance explains the one-call process, while state and local requirements determine important details of how the process works for a specific job.
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Compare local instructions on the points that affect your work. First, confirm when to submit the request and when excavation may begin; the cited examples include at least two business days in Southern California Gas guidance and three business days in Columbia Gas of Pennsylvania guidance. Second, find the tolerance-zone definition and its measurement. Third, confirm which excavation methods are permitted or recommended near a marked line. Fourth, ask whether the one-call request covers private facilities at the property. Finally, know whom to contact if damage occurs or a mark is unclear.
A deadline published by a utility in Southern California cannot establish the deadline in Pennsylvania or Texas. Likewise, a Texas tolerance-zone measurement cannot be used as the rule for a job elsewhere. These local examples illustrate why the exact ticket and jurisdiction matter; they are not national statistics or universal instructions. When guidance conflicts or the ticket is unclear, contact the local one-call center or affected operator rather than choosing the less restrictive instruction.
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The 811 process is useful only when each step is completed: the work area is described accurately, the waiting period is observed, responses are confirmed, marks are understood, private-line coverage is checked, and local excavation precautions are followed. If any of those conditions is uncertain, resolve it before breaking ground. Free notification does not remove the excavator’s responsibility to wait, respect marks, and work carefully.
Before-you-dig checklist
- Describe the full excavation area and the type of work accurately when you submit the request.
- Call 811 or use the local one-call center’s request channel, and keep the ticket information.
- Use the response period specified for your jurisdiction; do not assume another state’s deadline applies.
- Confirm that required operators have responded and that the marks cover the planned work area.
- Ask for clarification or a remark if a mark is missing, unclear, damaged, or inconsistent with the plan.
- Check whether customer-owned or privately installed lines need a separate private locate.
- Follow local tolerance-zone dimensions and excavation-method requirements; never use a tool to search for a pipe.
- If a line is damaged, move away and call 911 and the gas utility from a safe place, then promptly report the damage to the operator even if there is no apparent leak.
Frequently Asked Questions
Is calling 811 free?
PHMSA describes the U.S. one-call service as free. Check the local center’s request options and coverage for your specific property; a separate private locating service may be needed for lines outside the public request.
Do I call 811 before digging?
Yes. Call 811 or submit a request through the local one-call center before excavation. Wait for the locally required response period and confirm that required operators have responded and marked their facilities before starting.
How long should I wait after calling 811?
There is no single deadline for every U.S. location. PHMSA says state law sets the operator response period. Southern California Gas gives an example of at least two business days, while Columbia Gas of Pennsylvania cites three business days for its local guidance. Follow your one-call center’s instructions.
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No. A surface marker is not a measurement of the pipe’s precise underground position or depth. Arrange a current locate through the one-call process and ask the operator about unclear markings.
Do utility marks show how deep a gas line is?
No. Marks indicate a facility’s location at the surface; they do not establish pipe depth or guarantee its precise underground position. Follow local instructions and ask the utility to clarify marks you cannot interpret.
The Bottom Line
Before any U.S. excavation, call 811 or contact the local one-call center, wait for the jurisdiction’s required responses, and confirm that marks cover the work area. Marks do not show depth, private lines may need a separate locate, and local rules control how to dig near facilities. If a line is damaged, move away and call 911 and the gas utility from a safe place; report the damage promptly even if no leak is apparent.
