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Before breaking ground, contact your local 811 center, mark the proposed excavation area, wait through the locally required response period, verify that every notified utility has responded, and then expose marked facilities with the method your jurisdiction allows. A painted line is an approximate indication—not a guarantee of exact location or depth. Keep digging outside the applicable tolerance zone until the facility is safely exposed, and stop immediately if you damage or even suspect contact with a line.
The details that control a safe dig—notice lead time, tolerance-zone width, ticket life, positive-response checks, and treatment of private lines—vary by state and sometimes by utility. Use the sequence below as a practical framework, then follow the current instructions from your state 811 center.
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Why a small excavation can become a serious utility emergency
Buried electric, natural-gas, water, sewer, telecommunications and other facilities may cross a property even when there is no visible sign at the surface. A fence-post hole, tree planting, mailbox, drainage trench or deck footing can reach a service line. The Missouri Public Service Commission consumer page says a buried utility line is damaged by digging activity about every three minutes in the United States and attributes about one-third of incidents to a call not being made to 811. That page does not identify a publication year or the underlying dataset, so treat those figures as an undated warning rather than a current national rate.
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Use this safe-dig sequence every time
- Plan the excavation. Define the full work area, including access paths, spoils piles, grading and any later enlargement. Gather the property address, nearest cross street, start date, estimated duration and a description of the work.
- White-line the proposed dig area. Mark the planned route or footprint on the ground with white paint, flags or another method accepted by your 811 center. Clear white-lining lets operators send locators to the correct area and reduces ambiguity on large or irregular sites.
- Submit a locate request to the local 811 center. Follow that center’s online or telephone procedure. Colorado 811 advises contacting 811 before any digging project; New Mexico 811 explains that the center notifies participating facility owners, who arrange to mark their facilities.
- Allow the local response period. New Mexico 811 describes a minimum of two working days, but that is not a nationwide deadline. Weekends, holidays, weather, ticket type and state law can change the schedule. The ticket confirmation should tell you when excavation may begin and how long the ticket remains valid.
- Check positive response before mobilizing equipment. Indiana 811 advises checking the positive-response system and contacting non-member utilities when needed. Virginia811 likewise instructs excavators to check its positive-response system. A facility may be marked, cleared because it is not present, or reported as unable to complete a locate; do not treat an unanswered utility as approval.
- Preserve and interpret the marks. Photograph the marks and ticket information, keep paint and flags visible, and protect them from grading, weather and traffic. If they are unclear, disturbed or no longer legible, ask the center whether a re-mark or ticket update is required.
- Excavate using the local tolerance-zone practice. Outside the zone, normal excavation may be permitted under local rules. Within it, use careful hand digging or another accepted non-invasive method to expose the facility before using powered equipment. New Mexico 811 identifies vacuum excavation as an option.
- Stop and report any contact or damage. Shut down excavation, keep people away, and notify 811 and the utility as the local instructions direct. If gas or another dangerous substance is escaping, or anyone faces immediate danger, move to a safe location and call 911.
Step 1: Define the work and mark it in white
Include the whole area, not just the first hole
Locate requests are based on the area you describe. Include the trench alignment, side connections, bore pits, grading limits, temporary access and any alternate position you might use if the design changes. A ticket for one post hole does not automatically cover a later patio, retaining wall or utility trench elsewhere on the lot.
Why white-lining matters
Several state programs recommend white-lining before a request. The white outline tells locators exactly where excavation is planned, especially on wooded, undeveloped or densely marked property. Use the marking method and color conventions your center specifies; do not rely on a verbal description when a visible outline is practical.
Step 2: Contact 811 and wait for the local deadline
Submit the request before scheduling excavation
Call or use the online service of the 811 center serving the project location. Provide a precise address, nearest intersection, contact details, project type and the start window. Ask what information is required for private roads, rural parcels, multi-lot developments and emergency work.
There is no single national waiting period
New Mexico 811 states that requests should be made at least two working days before digging. Other states use different working-day counts, notification windows, ticket durations and exceptions. A federal-sounding “wait 48 hours” rule can be wrong for your location. Read the confirmation and calendar the earliest legal start time shown by your center; do not count weekends or holidays unless the center expressly does so.
When a ticket expires or the project is delayed
Ask the center how long the ticket remains active and when a refresh or re-mark is required. If rain, permitting or a contractor change pushes work beyond the ticket’s validity, request an update rather than assuming old marks remain reliable. A re-mark is also prudent when construction activity, landscaping or traffic has erased the paint.
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Step 3: Verify every utility’s response
Read the positive-response status
Positive response is the system record showing what each notified utility did. A status may indicate marked facilities, no facilities in the area, or a problem that prevented completion. Indiana 811 and Virginia811 both direct excavators to check this status before work. Save a screenshot or printout with the ticket number and date for the project file.
Resolve “no response” and “unable to locate” entries
Do not begin because most colors are present. Contact the 811 center or the utility shown in the status and follow its escalation process. If an owner has not responded, the center may require a new notice, a second contact or a documented waiting period.
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811 centers notify participating facility owners, not every line on every parcel. Indiana 811 advises contacting non-member utilities. Virginia811 says private utility lines should be marked by the owner. Examples can include a line from a house to a detached garage, a private septic or well system, irrigation, lighting, propane equipment and facilities installed after the public utility’s meter. Ask the property owner, facility manager or utility where ownership changes and arrange a private locate when required. The local 811 center can explain its boundaries, but it cannot mark a line it does not control.
How to read utility marks without over-trusting them
Color identifies a facility category, not exact depth
Paint, flags and stakes are surface indicators of an underground facility’s approximate horizontal path. They do not certify exact depth, alignment, condition or ownership. A line can curve, change depth, be offset by an obstruction or be inaccurately mapped. Never assume that a mark’s center is the precise edge of a pipe or cable.
Keep marks visible and current
Photograph the site after marking, protect flags from vehicles and replace only markings the center or utility authorizes you to replace. If another contractor excavates nearby, recheck the ticket and marks before continuing. When a mark fades or conflicts with exposed evidence, stop and request clarification; do not “eyeball” the route from an old paint fragment.
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Depth is not a safe-distance calculation
Ground movement, erosion, landscaping, road work and installation tolerances can change cover. A line shown at one depth on a plan may be shallower in another section. Locate marks tell you where to use extra care, not how deep you may safely drive a blade.
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A tolerance zone is the area around a marked facility where excavation requires heightened care. Its width and the permitted exposure method are set by local rules, so never carry a dimension from one state to another.
| Jurisdictional example | Guidance described by the state program | What it means for a crew |
|---|---|---|
| Indiana | Indiana 811 describes a two-foot tolerance zone. | Use the Indiana-required careful-excavation practice within that zone and confirm the current rule with Indiana 811. |
| Alabama | Alabama 811 describes an 18-inch tolerance zone. | Follow Alabama’s specified hand-excavation and exposure requirements; do not substitute Indiana’s measurement. |
| Colorado | Colorado 811 describes an 18-inch tolerance zone. | Apply Colorado’s current method and clearance instructions, including any conditions for powered equipment. |
| New Mexico | New Mexico 811 identifies a tolerance-zone practice and lists vacuum excavation as an exposure option. | Confirm the current zone width and accepted methods with New Mexico 811 before starting. |
These examples illustrate why a nationwide answer to “How close can I dig to the marked underground utilities?” would be misleading. The responsible distance may also depend on the facility type, the excavation tool, local statute and the utility’s instructions.
Excavate safely inside and around the zone
Expose the facility before using powered equipment
Where local guidance requires it, use a hand digging shovel, non-conductive hand tools where appropriate, or vacuum excavation to daylight the facility. Remove soil in small lifts, keep the tool controlled, and work from the side toward the marked path rather than driving straight down onto it. Once the line is exposed, support it as required by the utility or project engineer and maintain the clearance your local rule specifies.
Do not treat a shovel as a substitute for locating
Hand digging reduces the force applied near a facility, but it does not identify an unmarked private line, eliminate electrical contact risk or satisfy the 811 process. A shovel can puncture a gas pipe or strike a cable if the line was not located or the mark was misread. Locate first, then hand-excavate where the tolerance-zone rule calls for it.
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Control the work area
- Brief every worker and subcontractor on the ticket, marks, tolerance-zone boundary and stop-work signal.
- Keep machinery, trench boxes, augers and spoil piles from obscuring marks or loading an exposed facility.
- Use a spotter when equipment operates near marks and keep the operator within a clear line of communication.
- Reassess after rain, grading, a design change or any discovery that conflicts with the locate.
- Follow electrical, confined-space, trenching and gas-safety requirements in addition to 811 procedures.
Can you start digging as soon as the utilities are marked?
Not automatically. Start only after the local response period has ended, the positive-response record is complete, unresolved utilities have been addressed, and the marks are clear enough to follow. Then apply the tolerance-zone method. “Marked” is not the same as “safe to excavate with a machine.” If any facility owner reports an incomplete locate, if a mark disappears, or if your planned work moves outside the described area, pause and obtain updated instructions.
When to request a re-mark or new ticket
- The ticket’s validity period has ended or the start date changed substantially.
- Paint or flags are washed away, covered, moved or confused with construction layout marks.
- The excavation expands, shifts or adds a branch not included in the original white-lined area.
- A utility response changes, a new facility is installed, or another contractor disturbs the ground.
- An exposed line does not align with the mark or appears at an unexpected depth.
Ask the 811 center whether the correct action is a refresh, re-mark, update or entirely new request. Keep the new confirmation with the crew’s daily plan.
What to do if you hit, nick or expose a utility
Stop first
Stop excavation immediately, shut down equipment if it can be done without creating additional danger, and keep workers and bystanders away. Do not touch an energized cable, enter a flooded or contaminated excavation, or operate equipment around escaping gas.
Report the incident
Notify 811 and the affected utility as directed by the local center. Give the address, ticket number, facility type if known, visible damage and whether anyone is injured or exposed. Do not resume until the utility or emergency authority releases the area.
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Call 911 for immediate danger
Alabama 811 states: “If there is a release of gas or immediate danger to people or property, step away from the area and call 911.” Move crosswind or to another safe location as conditions require, warn others without approaching the release, and stay away until emergency responders say it is safe.
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Never conceal or repair the damage yourself
Do not backfill, tape, clamp, reconnect or hide a damaged line. Even a small nick can fail later, and moving soil can trap gas or leave an energized conductor exposed. Preserve the scene for the utility’s assessment and document what happened after people are safe.
A practical pre-dig checklist for homeowners and crews
- Project scope and white-line marks match the work that will actually occur.
- Local 811 request submitted with the correct address and start window.
- Required working days and holidays accounted for.
- Ticket number, expiration or re-mark rule recorded.
- Positive-response statuses checked for every notified facility owner.
- Non-member and private lines identified and separately located where needed.
- Paint and flags are visible, photographed and protected.
- State-specific tolerance-zone width and exposure method reviewed with the crew.
- Hand digging or vacuum excavation equipment and a competent spotter are available where required.
- Stop-work, utility-contact and 911 instructions are posted at the excavation.
Questions that depend on your location
Does 811 locate every underground line?
No. The center coordinates participating facility owners. Non-member and privately owned lines may require a separate request arranged by the owner or excavator. Confirm the boundary for your property and project.
Is the tolerance zone always 18 inches or two feet?
No. State guidance differs: Indiana describes two feet, while Alabama and Colorado describe 18 inches. New Mexico’s guidance requires confirming the local zone and allows vacuum excavation as an exposure option. Use the rule for the project location, not a remembered number.
Are utility marks exact?
No. They are approximate surface indications of horizontal position. They do not guarantee exact depth, edge or condition, which is why careful exposure is required near a mark.
Can a contractor rely on a locate from a previous project?
Only if the 811 center confirms that the ticket is still valid, the marks remain legible and the current work is within the described area. Otherwise request an update or new locate.
What if the utility response says it is clear?
Keep the positive-response record. “Clear” generally means that utility reports no facility in the described area; it does not clear private lines or facilities owned by another operator. Continue checking every response and excavate cautiously.
Bottom line for a safe excavation
Make the 811 request before every excavation, white-line the full work area, wait for the local deadline, verify positive response, locate private facilities separately, and treat marks as approximate. Within your jurisdiction’s tolerance zone, expose the facility with the accepted careful method before powered digging. If anything is damaged or a release creates danger, stop, move away, notify the utility and 811, and call 911 when necessary. State 811 centers—not a generic national rule—control the current details for your site.
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