Call 811 Before Digging (Utility Locating)
Before any digging, submit a locate request through your state’s 811 center and wait for the required responses. The service is free, but deadlines and ticket rules vary by location. Confirm which public utilities have responded, arrange private locating where needed, and use careful, non-destructive methods inside the locally defined tolerance zone.
A post hole, fence, drain, or tree planting can reach a buried line sooner than you expect. A utility strike can cause injury, service loss, costly repairs, or an emergency. Taking time to plan the locate request helps you avoid turning a small property job into a dangerous one.
I treat utility locating as part of the job plan, not a last-minute phone call. The work area, notice period, private lines, and digging method all matter. Here is a practical process for rural lots and small-acreage projects.
Utility Locate Setup and Pre-Dig Safety
A locate request tells underground utility operators where and when you plan to dig, so they can mark covered public facilities or report no conflict. In the United States, 811 connects you with the applicable state service. Requests are free, but local laws set notice periods and ticket rules.
Plan the request
Start by drawing the full excavation area, including access routes or separate spots where digging will occur. Mark the proposed limits in white paint or flags when required or advised by your state center. White is the APWA temporary-marking color for proposed excavation.
Submit the request online or by phone through your state 811 center. Give clear directions, a site contact, the planned start date, and the type of work. Note gates, livestock, locked areas, or other access limits. A locator who cannot reach the work area may not be able to complete the job.
Many jurisdictions require at least two business days’ notice, but that is not a universal deadline. State law and ticket rules control. Confirm the local notice period, when the ticket becomes valid, how long it remains active, and how to request a refresh or remark.
| Marking color | Common APWA meaning | What to do |
|---|---|---|
| Red | Electric | Keep the marks visible; use the local tolerance-zone method near the line. |
| Yellow | Gas, oil, steam, or petroleum | Treat as a serious hazard; stop if you find an unexpected line or suspect damage. |
| Orange | Communications | Protect the marks and expose carefully where required. |
| Blue | Potable water | Confirm the marked route before excavation. |
| Purple | Reclaimed water, irrigation, or slurry | Do not assume this includes private irrigation lines. |
| Green | Sewer or drain | Check for private septic or drain piping separately. |
| Pink | Temporary survey markings | Do not confuse survey marks with utility marks. |
| White | Proposed excavation limits | Use to show the area you want located. |
These are standard color meanings, but marks can be affected by site conditions and local practice. Read the state center’s instructions and ask about any unclear marking.
Check for private facilities
Public utility marks do not necessarily show customer-owned lines. Private facilities may include electric service beyond the utility’s coverage, gas piping, water lines, irrigation, septic systems, and landscape lighting. On rural land, lines added by past owners or contractors may not appear on utility records.
Review property plans and ask the current or former owner about known routes. If private lines may be present, arrange a qualified private locate before digging. Do not treat the absence of public marks as proof that the ground is clear.
Next step: Submit early, define the whole work area, and identify private lines before you set a shovel or machine in motion.
Field Excavation and Marked-Line Protection
A tolerance zone is the legally defined area around a buried facility where extra care is required. Its width and rules vary by state or locality and may differ by utility. A distance of 18 to 24 inches from a facility’s outside edge is common, but it is not a universal standard.
Verify before breaking ground
Wait through the required response period and check the status of every affected operator. Each should mark its facilities or report no conflict, as required by local rules. If a response is missing, a mark is unclear, or a line appears to cross the work area, do not begin there. Contact the 811 center or operator and request the required response or a remark.
Walk the marked area before excavation. Compare the marks with your planned route and site records. Take photos if useful, especially where marks may be disturbed by traffic, weather, or site work. Keep paint and flags visible during the job.
Match the method to the zone
Outside the tolerance zone, follow the ticket instructions and applicable local rules for excavation. Inside it, use careful, non-destructive exposure, such as hand digging or an approved vacuum-excavation method. Do not use powered equipment within the zone unless local rules expressly allow it and the method is approved.
The zone is measured from the facility’s outside edge, not necessarily from the center of a painted line. Confirm the local definition before work begins. Maintain any required clearance and avoid pulling, striking, or placing weight on an exposed line.
If you uncover a facility that is not marked, or its route differs from what you expected, stop work near it. Keep people and equipment clear, contact the operator or 811 center, and get direction before continuing. Do not assume an old map or a prior locate is accurate for today’s work.
Next step: Keep marks visible, work slowly near them, and stop whenever the actual site does not match the locate information.
Locate Verification, Re-Marking, and Damage Response
Locate verification means checking that responses are complete, marks are clear, and the ticket still covers the planned work. Marks can fade, wash away, or be disturbed. A locate is useful only while you can identify the marked route and meet the ticket’s conditions.
When to request a remark
Ask for a remark if marks are missing, unclear, damaged, or no longer visible enough to guide the work. Also check whether the ticket has expired or whether a change in the work area requires a new request. Follow your state center’s process; do not dig based on incomplete marks or an expired ticket.
Keep a simple job record: ticket number, request date, planned work area, operator responses, photos, and any calls about changes. This helps you confirm what was checked and when. It also makes it easier to brief a family member or contractor who will be working on the property.
Two common field situations
For a new fence on a rural boundary, first show the full post line as the proposed excavation area. Public electric or communications facilities may be marked, while a private gate circuit or water line may not be. Arrange private locating if those lines could be near the fence, then use the locally required method around marked facilities.
For a drainage trench near a house, the public sewer response may not identify private septic piping, downspouts, or other owner-installed lines. Check records and arrange a private locate where needed. If a mark is missing or the trench route changes, pause and obtain an updated response rather than extending the excavation blindly.
These are common planning scenarios, not a substitute for a site-specific locate. The exact lines and rules depend on the property and jurisdiction.
If a line is damaged
Stop work and keep people away from the damaged facility. Contact the utility operator and follow its instructions. For a gas-line strike or suspected leak, stop equipment, avoid creating sparks or operating switches, move people away, and call emergency services and the gas utility from a safe location. Do not try to repair, cover, or backfill the line.
Next step: Treat a mismatch, missing mark, or suspected strike as a stop-work issue until the operator gives direction.
Ticket Closeout and Site Documentation
Closeout means leaving the site and records in a condition that meets the operator’s and local rules. It includes protecting exposed facilities, reporting damage, and documenting work or changes. Ticket closure does not make an unsafe excavation safe; follow all site and operator instructions first.
Protect any exposed facility from damage while work continues. Notify the operator promptly about damage or a suspected strike, even if the line still appears to work. Follow the operator’s directions and do not conceal the area before the situation is addressed.
Restore or document marks as required by local rules, and close the ticket through the state center’s process if needed. Keep the ticket number, dates, photos, operator responses, private locate notes, and any incident records with the property’s maintenance files. This record can help with future repairs or projects, but it does not replace a new locate request for later digging.
Next step: Finish by confirming any required reports or ticket actions, then save the records where the next person planning work can find them.
Frequently Asked Questions
These answers cover common questions about submitting a request, reading marks, and deciding when to pause work. Requirements vary by state, so use your state 811 center’s instructions for deadlines, ticket life, tolerance zones, and excavation methods.
Is an 811 request free?
Yes. The request is free through the applicable state 811 center. Private locating, if needed, may involve a separate service and cost.
How long before digging should I submit a request?
Follow your state’s deadline. Many jurisdictions require at least two business days, but that timing is not universal. Confirm the notice period and ticket validity locally.
Can I dig if no utility marks appear?
Not until required responses are complete and you have confirmed the status of affected operators. If a response or mark is missing, contact the center or operator for direction.
Does 811 locate every buried line on my property?
No. Public utility locating may not cover privately owned facilities such as irrigation, septic, landscape lighting, or customer-owned service lines. Arrange a qualified private locate when needed.
What does a white marking mean?
White indicates proposed excavation limits under APWA temporary marking colors. It shows the area to be located; it does not identify a buried utility.
What is the tolerance zone?
It is the legally defined area around a buried facility where special care is required. Width and rules vary by location. Although 18 to 24 inches from the facility’s outside edge is common, verify your local rule.
Can I use a mini excavator near a marked line?
Use the method allowed by local rules and ticket instructions. Within the tolerance zone, careful hand digging or an approved vacuum method is generally required; powered excavation is not permitted unless local rules expressly allow it.
How long do utility marks last?
There is no single period that applies everywhere. Ticket validity and mark-refresh rules vary. Request a remark if marks are unclear, disturbed, or no longer valid under local rules.
What should I do if I find an unmarked line?
Stop work near it, keep equipment clear, and contact the 811 center or relevant operator. Do not assume the line is abandoned or safe to move.
What if I hit a gas line?
Stop work, do not operate equipment or create sparks, move people away, and call emergency services and the gas utility from a safe location. Do not attempt repairs or cover the line.
(This article was written by one of our staff writers, Victor Dempsey. Visit our Meet the Team page.)
