# Utility Marking Colors: Read the APWA Code Before a Fiber Build

**Author:** Julio Martinez Sr.

**Published:** October 9, 2026

**Last updated:** October 9, 2026

**Category:** Permitting & Utility Coordination

**URL:** https://draftech.com/blog/utility-marking-colors

**Title tag:** Utility Marking Colors: APWA and 811 Guide 2026

**Meta description:** Utility marking colors explained: APWA paint and flag meanings, offset marks, 811 positive response, tolerance zones and re-marks for fiber construction.

**Visible word count:** 2796

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An orange line across a proposed fiber route tells the construction team that communications infrastructure is already there. It does not tell the team how deep that infrastructure sits or whether the excavation can proceed. We treat the paint as information that needs to agree with the locate ticket and the work actually planned.

This guide explains the color code. It shows how a fiber project uses the markings before ground disturbance. We focus on the handoff between route engineering and excavation, where a changed pit location can make an otherwise orderly package incomplete. State one-call requirements control the excavation process; a color chart cannot replace them.

## What utility marking colors tell a fiber project

Utility marking colors are the 8 colors in the APWA Uniform Color Code used to distinguish buried facility types, proposed excavation and temporary survey work. Paint and flags communicate the approximate horizontal location or purpose of a mark. They do not establish depth, prove that every facility is marked or authorize digging.

The American Public Works Association's *Uniform Color Code*, published in 1999 and still listed in APWA's resource library, supplies the shared legend. Its companion *Guidelines for Uniform Temporary Marking of Underground Facilities* carries revision 4/99. We use that legend to interpret the category of a mark, while current state one-call instructions govern the job's timing and excavation precautions.

### Read a line as part of a marked system

Start with the color. Then read the accompanying owner identifier and any facility notation. An orange stripe might represent a communications cable or a conduit system; it cannot tell you the carrier or cable count by color alone. We want the route reviewer to preserve the notation beside the stripe when recording a potential conflict, because a cropped photograph can remove the information needed to ask the right utility owner a question.

A sequence of marks indicates an alignment through the requested area. Flags make that alignment easier to see in grass, while paint can remain visible on pavement. Neither material makes the location exact. Where several alignments converge, we ask the responsible locator to explain which marks belong together rather than connecting the nearest matching colors into an assumed route.

### Offsets point away from the painted reference

An **offset mark** is intentionally displaced from the facility it describes. Read its direction and stated distance together, using the identified reference point. Gopher State One Call's *What Do the Marks Mean?* reference describes offsets as identifying the facility owner, direction and distance to the utility. The paint itself is therefore not necessarily over the line. Is the reference unclear? Request clarification before treating it as a position.

Numbers near paint do not establish depth. It may describe facility size, the width of a duct arrangement or an offset. We carry the meaning supplied by the locator into the coordination record; we do not assign a meaning from the number's position in a photograph. Width or corridor markings also need to survive the handoff, since reducing a broad facility to a thin CAD line can hide the conflict.

### Keep proposed work separate from existing facilities

White excavation markings describe what the excavator intends to disturb. They do not certify that the area is clear. Pink survey marks serve another purpose again: they can identify temporary survey references without representing a buried utility. We keep both distinct from existing-utility information on a route drawing so that a proposed bore does not acquire the appearance of a confirmed existing line.

Label each utility feature's source. Keep uncertainty visible during the desk review. A photographed paint mark and a surveyed exposure are different evidence. Our discussion of [subsurface utility GIS and design handoffs](https://draftech.com/blog/subsurface-utility-gis) explains why those distinctions matter when field information reaches a designer. Our design has a limitation: we engineer around the information available, so a qualified investigation must resolve any uncertain utility position before we can rely on it to advance the design.

## The APWA utility marking colors reference

| Color | Meaning | Reading on a fiber project |
| --- | --- | --- |
| Red | Electric power lines and associated cables or conduit | Existing electric facility |
| Yellow | Gas, oil, steam, petroleum or gaseous materials | Existing pipeline or related facility |
| Orange | Communications, alarm or signal lines and conduit, including fiber | Existing communications facility |
| Blue | Potable water | Drinking-water infrastructure |
| Purple | Reclaimed water, irrigation and slurry lines | Nonpotable-water or related system |
| Green | Sewers and drain lines | Wastewater or drainage infrastructure |
| Pink | Temporary survey markings | Survey reference, not utility clearance |
| White | Proposed excavation | Planned disturbance, not an existing utility |

### Red: electric

Red flags or paint identify electric facilities, including power cables and conduit. A fiber alignment running beside red marks needs the electric owner's requirements considered in the design. **Color does not indicate voltage**, and proximity to an ordinary service connection does not make excavation harmless. We keep the proposed fiber position separate from any assumption about electric depth, because a red surface mark identifies a facility category without establishing the vertical clearance available for the design.

### Yellow: gas, oil and steam

Yellow covers gas and oil facilities and can also indicate steam or other petroleum and gaseous materials. The marking does not identify operating pressure or establish a crossing agreement. We separate the locate process from the owner's crossing review; the [pipeline encroachment permit workflow](https://draftech.com/blog/natural-gas-pipeline-encroachment-permit-telecom) addresses that additional coordination.

### Orange: communications, including fiber

Orange includes fiber, other communications lines and associated conduit. It can also denote alarm or signal facilities. An orange marking near the proposed route may belong to an existing network that needs protection throughout construction. We do not infer spare conduit capacity from the paint, even when the design would benefit from a shared crossing.

### Blue: potable water

Blue identifies potable water. For route design, a blue alignment is a utility conflict to evaluate, not a dependable depth reference. We need the relevant owner's separation requirements and suitable location information before choosing how the proposed fiber will pass it. A valve cannot establish crossing geometry.

### Purple: reclaimed water

Purple identifies reclaimed-water systems and includes irrigation and slurry lines in the APWA legend. Keep it distinct from blue. The fluid category does not determine whether a fiber route can occupy the same corridor, and a reclaimed-water owner may still need to review the design. Our coordination record should name the owner rather than stop at the color, so the route reviewer knows whose separation requirements and crossing conditions still need to be resolved before selecting the alignment.

### Green: sewer and drain

Green identifies sewers and drain lines. It does not tell the designer whether the marked system is a gravity line or a pressurized facility. Where the proposed excavation approaches a structure connected to that line, we include the structure in the conflict discussion. Moving the fiber beside the paint may still leave a vault excavation in conflict.

### Pink: temporary survey

Pink marks identify temporary survey work. They can help a survey team retain references, but they are not an all-clear response from a utility owner. We preserve the distinction on field notes and photographs. If a pink mark's purpose is unknown, the surveyor responsible for it should explain it before anyone uses it to set a construction position.

### White: proposed excavation

White marks outline the planned excavation or route so locators can understand the requested work area. For fiber, that means considering the actual ground disturbance around the alignment, including pits where applicable. Match white-lining to the current drawing. A clearly marked but superseded route sends the locate effort to the wrong place.

## Move from white-lining to the 811 response

The excavator's locate request must describe the work that will actually happen. Common Ground Alliance's *Tips for Excavators* calls for a specific dig-site location and dimensions, a usable contact and a detailed work description. During construction planning, agree on who will submit the request; otherwise, the design team and the excavator may each assume the other has done it.

White-line the proposed work area using the state center's instructions before the locate visit where required or appropriate. Include the excavation footprint, not just the cable centerline. A pit beside a roadway can extend beyond the line shown on a route overview; if the ticket describes only the roadway crossing, the work area and the requested locate may disagree.

Submit the 811 ticket through the appropriate state one-call center. Retain its confirmation. **Wait times vary by state.** Use the center's current instructions for notice periods and ticket validity, including how its clock treats nonworking days. We would not build a national construction schedule around a waiting period copied from another state's handbook.

Before excavation, check the positive response for every notified operator and reconcile that response with the site. CGA's *Before You Dig* guidance requires waiting the required period and confirming that all utilities have responded. A no-conflict response applies to the responding operator and the described work area; it is not a declaration that the ground contains nothing.

An unresolved response stays unresolved. Follow the state center's procedure for missing responses or discrepancies, and do not start the affected excavation merely because a scheduled date has arrived. The crew should receive the response record alongside the drawing revision. That makes a route change visible before someone mistakes yesterday's ticket coverage for today's scope.

We also keep excavation notification separate from permission to build. An approved roadway permit does not replace the locate request, and a completed ticket does not grant an easement. The [utility coordination process for fiber construction](https://draftech.com/blog/utility-coordination-fiber-construction-process) places those owner interfaces within the broader project sequence. Our engineering handoff should state which decision each record actually supports.

## Respect tolerance zones and verify crossings

A tolerance zone surrounds a marked facility and triggers the applicable protective excavation requirements. Its dimensions and measurement rules vary by state. Consult your state one-call center's current excavator guidance before laying out work beside a mark; do not measure from a displaced offset flag as though that flag were directly above the facility. Resolve the reference first.

Hand digging is part of careful exposure where required, and approved non-invasive excavation methods may also be allowed. Neither method is automatically harmless. The excavator must follow the governing requirements and the facility owner's precautions until the utility is exposed and identified. A shovel can damage a shallow line, so switching away from a machine does not remove the need for a controlled procedure.

**At an unclear crossing:** stop the affected excavation and ask the utility owner or its locator to resolve the marking. A drawing revision cannot turn an unreadable field mark into a verified utility position.

For a fiber bore, surface paint does not prove vertical separation at a crossing. We need the required exposure information and the owner's crossing conditions reflected in the design decision before the installation method is accepted. The construction team must follow its approved procedure for verifying and monitoring the crossing, including the relevant requirements for the bore and any reaming operation.

Our [utility-owner coordination for route design](https://draftech.com/services/utility-coordination) connects those field questions to the proposed alignment. Draftech engineers routes and coordinates with utility owners; we do not perform utility locating or subsurface utility engineering. When an unresolved position needs specialist investigation, we identify the design question that the qualified provider must answer, rather than describing a painted line as verified subsurface geometry.

## Request re-marks when the evidence changes

Paint can disappear before the job is finished. Traffic and weather can obscure the alignment, and earthwork can remove its reference surface. When markings are missing or no longer readable, stop affected work and request re-marks through the state one-call process. Do not reconstruct utility marks from memory or move flags to make room for equipment.

A route revision needs its own coverage check. If a handhole moves beyond the area described on the ticket, ask the center whether an update or new request is needed and follow the resulting response and waiting requirements. We want the revised drawing to identify that unresolved work area so the crew does not treat the design change itself as permission to excavate.

Photographs help document what was visible at a particular time, but they do not renew a ticket or restore valid field markings. Include enough of the surroundings in each photograph to show where it was taken. A close-up of orange paint with no reference may establish its color while leaving the project manager unable to tell which crossing needs a return visit.

Private facilities also need attention. The state center can explain what its notification system covers and how to address facilities outside that coverage. Ask the property owner about privately owned lines and arrange appropriate locating through a qualified provider where needed. Our route coordination should expose that gap early; a completed response from participating operators must not become an assumption about every buried line.

## Give each project role a clear next step

**For the fiber owner:** require the project team to distinguish design readiness from excavation readiness. A route can be engineered while a specific crossing remains dependent on utility verification. Keep that dependency attached to the affected segment, where the construction team can see it even after procurement or permit approval.

**For the excavator:** match the current work limits to the ticket before mobilizing excavation. Use your state one-call center to confirm the applicable waiting period and tolerance-zone requirements. If the marks and the response disagree, stop affected work and resolve the mismatch. The schedule should reflect that decision instead of pressuring the crew to interpret uncertainty as clearance.

**For the route designer:** preserve the difference between an indicated alignment and a verified crossing. When issuing a change, show how it affects the work limits so the excavator can check whether the locate scope needs revision. That is how we keep an engineering solution from creating a new field problem when the excavation footprint moves.

**[Discuss utility conflicts on your proposed fiber route.](https://draftech.com/#dt-contact)** Bring the current alignment and identify the crossing that needs an owner decision.

Draftech's engineering is 100% in-house, so we can carry an unresolved owner requirement into the route revision without handing design responsibility away. We also deliver full turnkey construction through Draftech-managed subcontract crews. For help connecting a utility conflict to the next design decision, contact [info@draftech.com](mailto:info@draftech.com). Active in 24 states. Available across all 50 U.S. states.

If utility conflicts are still shaping your route, the [free route engineering offer](https://draftech.com/free-design) provides a way to bring those questions into design: Draftech engineers the first 20,000 linear feet of a qualifying route at no cost, from feasibility and field survey through permit approval. The owner reviews each request before Draftech commits the package.

## Frequently Asked Questions

### What do orange utility flags mean?

Orange identifies communications facilities, including fiber and associated conduit, under the APWA code. It also covers alarm and signal lines, so the color alone does not identify a particular network owner. Read the accompanying identifier and reconcile the markings with the 811 ticket response before excavation; an orange flag does not establish depth or available clearance.

### Do white markings mean an area is safe to dig?

White marks describe proposed excavation, not a utility owner's clearance of the area. They help communicate where the work will take place so the requested locate matches the planned disturbance. The 811 process still requires the applicable wait and responses, and the excavator must follow the state's protective excavation requirements before working near any marked facility.

### How far from a utility mark can machinery operate?

There is no single distance this national guide can supply: tolerance-zone dimensions and excavation requirements vary by state. Ask the state one-call center for the current rule and confirm how the marked facility's width affects measurement. An 811 response does not waive those precautions, and an offset flag must first be interpreted against its actual facility reference.

### Does an 811 ticket confirm the depth of buried utilities?

An 811 ticket and the resulting surface marks identify the requested area and indicate approximate horizontal utility locations; they do not certify burial depth. A number beside a stripe may refer to an offset or facility size instead. The excavator must obtain the required location verification and follow the applicable exposure procedure before relying on separation at a crossing.

### When should a fiber contractor request re-marks?

Request re-marks through the state one-call process when existing marks are missing, damaged or too unclear to guide safe work. A changed excavation area or an expiring ticket also needs attention under that center's rules. Keep the 811 record aligned with the current scope, and stop affected excavation until the required marking and response issues are resolved.