Performing Underground Utility Locating AHA (Activity Hazard Analysis / Job Hazard Analysis)
Updated 2026-06-23
A Performing Underground Utility Locating AHA (Activity Hazard Analysis / Job Hazard Analysis) is the plan that keeps the locating technician safe on the active site and near traffic, sound in the locate accuracy others dig against, and safe in the terrain and scanning work. Performing underground utility locating detects and marks buried utilities before ground disturbance — combining the active-site and traffic-access hazard, the locate-accuracy and false-clear hazard, and the terrain and ergonomic hazard. This guide walks through building a Performing Underground Utility Locating AHA that names the active-site/traffic-access, locate-accuracy/ false-clear, and terrain/ergonomic hazards and assigns the access, locate-accuracy, and terrain controls that hold up in the field.
Why performing underground utility locating needs its own AHA
Performing underground utility locating is the activity of detecting, tracing, and marking the buried utilities (electric, gas, water, sewer, telecom) on a site — using electromagnetic locators, GPR, and utility records — before any ground disturbance, so that excavation and drilling avoid striking them. The defining feature is that the locate is a critical safety function: crews dig against the marks, so an inaccurate locate can cause a utility strike. The hazards combine the active-site and traffic-access (locating is done on the active site, often in roadways and traffic areas — the traffic/struck-by and active-site hazards), the locate-accuracy and false-clear (the locate marks tell crews where utilities are so they can dig safely — a missed utility, an inaccurate mark, or a false clear leads to a utility strike during excavation (electrocution, gas explosion/release, flooding, serious injury), so locate accuracy is a critical safety function), the terrain and ergonomic (walking and working the locate across the site terrain, handling the locating equipment — the terrain and ergonomic hazards), and the environmental. The active-site/traffic-access and the locate-accuracy/false-clear justify a dedicated AHA.
Breaking performing underground utility locating into steps
The steps for a Performing Underground Utility Locating AHA follow the locate:
- Review utility records and plan the locate
- Set up traffic control where locating in traffic areas
- Locate and trace the utilities (electromagnetic/GPR)
- Verify and cross-check the locate (records, methods)
- Mark the located utilities clearly
- Manage the access, accuracy, and terrain hazards
- Communicate the locate and its limitations
- Complete
Each step carries a hazard, and the active-site/traffic-access, the locate-accuracy/false-clear, and the terrain/ergonomic are where the most significant risks concentrate.
The hazards step by step
Active-site and traffic-access
Locating is done on the active site, often in roadways and traffic areas — the traffic/struck-by and active-site hazards. The controls are traffic control where locating in roadways/traffic areas (work-zone setup, high-visibility PPE), awareness of site traffic and equipment, coordination with the active site, and the access controls. The active-site/traffic-access is a defining hazard. (These follow the traffic-control fundamentals.)
Locate-accuracy and false-clear
The locate marks tell crews where utilities are so they can dig safely — a missed utility, an inaccurate mark, or a false clear leads to a utility strike during excavation (electrocution, gas explosion/release, flooding, serious injury), so locate accuracy is a critical safety function. The controls are thorough locating (complete coverage, correct equipment/technique), reviewing and cross-checking against utility records and multiple methods, qualified/experienced locators, clearly and accurately marking the utilities, communicating the locate's limitations (locating is not infallible — treat unlocatable/uncertain utilities conservatively), and the accuracy controls. The locate-accuracy/false-clear is the primary defining safety function — a false clear causes a utility strike. (These follow the utility-locating fundamentals.)
Terrain and ergonomic
Walking and working the locate across the site terrain, handling the locating equipment — the terrain and ergonomic hazards. The controls are careful movement over the terrain (slip/trip), managing the ergonomics of the locating work, and the terrain/ergonomic controls. (These follow the ergonomic fundamentals.)
Environmental
The environmental (the outdoor locating environment — weather, conditions) carries the environmental hazard. The controls are weather/environmental protection, and the environmental controls. (These follow the environmental fundamentals.)
A simple Performing Underground Utility Locating AHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Review/plan | Records | Review utility records, plan the locate | project |
| Traffic control | Struck-by | Traffic control in roadways, high-visibility PPE | OSHA 1926.201 |
| Locate/trace | Accuracy | Thorough locating, correct equipment/technique | project |
| Verify | False clear | Cross-check records and methods, qualified locator | project |
| Mark | Utility strike | Clearly and accurately mark located utilities | project |
| Communicate | Limitations | Communicate the locate and its limitations | project |
Locate accuracy and traffic/site-access safety
A Performing Underground Utility Locating AHA centers on locate accuracy and traffic/site-access safety. The locate accuracy addresses the critical safety function of the locate — controlled by thorough locating (complete coverage, correct equipment/technique), reviewing and cross-checking against records and multiple methods, qualified locators, clearly and accurately marking the utilities, and communicating the locate's limitations, since a false clear causes a utility strike. The traffic/site-access safety addresses locating in roadways and active areas — controlled by traffic control (work-zone setup, high-visibility PPE), awareness of site traffic, and coordination with the active site. And the locating work gets terrain/ergonomic controls. An AHA built on locate accuracy and traffic/site-access safety, with terrain controls, addresses the hazards that define performing underground utility locating.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, performing underground utility locating is the activity whose entire purpose is preventing one of the most serious hazards in construction — the utility strike — so the locate accuracy is a critical safety function. The locate-accuracy and false-clear hazard is the defining concern: the whole point of locating is that crews will dig, drill, or excavate against the locate marks, trusting them to show where the buried utilities are. If the locate is inaccurate — a missed utility, a mark in the wrong place, or a false clear (an area marked clear when a utility is actually present) — the crew that subsequently excavates can strike a live utility, which is among the most serious hazards in construction: electrocution from a power line, an explosion or release from a gas line, flooding from a water line, or serious injury. So thorough locating with complete coverage and correct technique, reviewing and cross-checking against utility records and multiple locating methods, qualified and experienced locators, clearly and accurately marking the utilities, and communicating the locate's limitations (locating is not infallible, and uncertain or unlocatable utilities must be treated conservatively) are the controls. The locator's marks are a safety promise that others rely on with their lives.
The active-site/traffic-access and the terrain/ergonomic are the other defining hazards. On the projects I have run, locating is done on the active site, often in roadways and traffic areas (that is where the utilities and the planned excavation are), so the technician faces traffic and struck-by hazards — controlled by traffic control where locating in roadways or traffic areas (work-zone setup, high-visibility PPE), awareness of site traffic and equipment, and coordination with the active site. Like the GPR technician, a locator focused on the instrument is not watching for traffic, so the traffic control must be set up around them. The terrain and ergonomics of walking and working the locate, and the environmental conditions, round it out. The AHA built on locate accuracy and traffic/site-access safety is the one that protects the locator and every crew that digs against the marks.
The bottom line
A Performing Underground Utility Locating AHA names the active-site/traffic-access, the locate-accuracy/ false-clear, and the terrain/ergonomic hazards with specific controls — thorough cross-checked locating by qualified locators with clear marking and communicated limitations (a false clear causes a utility strike), traffic control and high-visibility PPE for locating in traffic areas, and terrain/ergonomic management. The locate accuracy and the traffic/site access are the defining concerns. The AHA that manages both is the one that protects the locator and everyone downstream.
Frequently asked questions
Why is locate accuracy a critical safety function?
Crews dig, drill, or excavate against the locate marks, trusting them to show where the buried utilities are — so if the locate is inaccurate (a missed utility, a wrong mark, or a false clear), the crew that subsequently excavates can strike a live utility, among the most serious hazards in construction (electrocution, gas explosion/release, flooding, serious injury). Controls are thorough locating (complete coverage, correct equipment/technique), cross-checking against utility records and multiple methods, qualified/experienced locators, clearly and accurately marking the utilities, communicating the locate's limitations, and the accuracy controls.
Why must the locate's limitations be communicated?
Utility locating is not infallible — some utilities are unlocatable or uncertain (non-conductive pipes, poor records, deep or congested utilities), so treating a locate as absolute can lead to a strike on something that was not detected. Controls are communicating the locate's limitations, treating unlocatable/uncertain utilities conservatively, cross-checking with records and multiple methods, recommending safe-digging practices (hydro-excavation, hand-digging) near marks, and the communication controls.
What traffic hazards apply?
Locating is done on the active site, often in roadways and traffic areas (where the utilities and planned excavation are), so the technician faces traffic and struck-by hazards while focused on the locating instrument. Controls are traffic control where locating in roadways/traffic areas (work-zone setup, high-visibility PPE), awareness of site traffic and equipment, coordination with the active site, and the access controls.
What is performing underground utility locating?
Performing underground utility locating is the activity of detecting, tracing, and marking the buried utilities (electric, gas, water, sewer, telecom) on a site — using electromagnetic locators, GPR, and utility records — before any ground disturbance, so excavation and drilling avoid striking them. Because crews dig against the marks (making locate accuracy a critical safety function) and locating is done in active/traffic areas, the locate-accuracy and traffic-access hazards apply.
Related AHAs and JHAs
- Performing Ground Penetrating Radar AHA — a locating method used in utility locating
- Utility Locating and Ground Disturbance JHA — the ground-disturbance protocols
- Underground Utility Installation JHA — the utility installation the locate protects
- Excavation and Trenching JHA — the excavation that digs against the marks
Written by Mustafa Tok, CSP, ASP, CHST — OSHA Authorized Outreach Trainer with 14+ years of international construction safety experience across federal, heavy civil, and industrial projects.