Every excavation, trench, or confined-space operation carries serious risks. Soil can shift, water can enter unexpectedly, and equipment movement can change site conditions within minutes. To manage these hazards, OSHA requires that a competent person be present whenever workers are exposed to excavation risks.
Municipal crews often hear the term during training but may not fully understand what the competent person is, what authority they have, or how they should be selected. This article explains what the competent person does, the training they need, and when they are required.
OSHA defines a competent person as someone who can identify existing or predictable hazards and has the authority to take prompt corrective action to eliminate those hazards.
This definition has two parts:
The individual must have the knowledge to recognize hazards.
The individual must have the authority to stop work and correct issues immediately.
A worker is not considered a competent person simply because they are experienced. They must have both the knowledge and the authority.
OSHA does not require a specific certificate, but the competent person must have training and experience that allow them to recognize hazards related to:
Soil types and soil behavior
Sloping, benching, shoring, and trench box requirements
Water accumulation and moisture issues
The effect of vibration from equipment or traffic
Safe access and egress in trenches
Structural hazards in excavations
Atmospheric hazards if the trench qualifies as a confined space
Proper placement of spoil piles
Safe distance for heavy equipment
Overall trench stability
Many organizations provide excavation safety training specifically designed for competent person certification. Most municipal departments send supervisors, foremen, or senior operators to these courses.
A competent person must also stay familiar with OSHA excavation standards, not just learn them once and forget them.
On public works or utility crews, the competent person is usually one of the following:
Highway or public works foreman
Senior equipment operator
Crew leader
Experienced laborer with excavation safety training
Supervisor or deputy superintendent
The key requirement is that they have both the knowledge and the authority to halt work. If a worker understands hazards but does not have the power to stop the operation, they are not a competent person under OSHA rules.
In many small departments, the same person serves as the competent person for most daily excavation work. Larger organizations may designate multiple workers so at least one trained person is always available.
A competent person is required at every excavation site where workers enter a trench or excavation that could pose a risk. This means:
Any trench 5 feet deep or deeper
Any excavation that could potentially collapse
Any trench with standing water or signs of water infiltration
Any excavation with adjacent equipment, vibration, or traffic
Any trench that requires sloping, benching, shoring, or a trench box
Any excavation deeper than 4 feet where atmospheric hazards may exist
Any excavation where soil type must be classified before entry
A competent person must inspect the excavation:
At the start of each shift
After every rain event
After freeze or thaw cycles
After any soil movement or sloughing
After heavy equipment has been operating nearby
After any event that could change stability
They must also inspect the trench at any time conditions change. There is no limit on how many inspections may be required in a single day.
A competent person must be able to:
Stop all work immediately
Remove workers from the trench
Correct unsafe conditions before work resumes
Reject unsafe equipment
Require the use of trench boxes, shoring, or sloping
Halt excavation if soil conditions deteriorate
Restrict access if atmospheric hazards appear
Refuse entry until protective systems are installed
If a worker has the knowledge but not the power to stop work, they do not meet the definition of a competent person.
A competent person is responsible for several key duties:
They must test and classify soil as Type A, B, or C.
They decide whether sloping, benching, shoring, or trench boxes are appropriate.
They verify that trench boxes, hydraulic shores, or other supports are installed correctly.
Ladders must be within 25 feet of workers and extend above the trench edge.
Groundwater, seepage, or standing water must be controlled before workers enter.
If needed, the competent person ensures testing for low oxygen or toxic gases.
Vibration, spoil piles, heavy equipment, and traffic must be assessed for collapse risk.
Excavation hazards are often invisible until the moment the collapse occurs. A trench can look safe right up until the second it fails. Having a competent person ensures that a trained, authorized individual is continuously looking for hazards, monitoring conditions, and stopping work when needed.
This role is a key part of preventing trench collapses, cave-ins, and injuries.
A competent person is not just a formality or a title. It is a critical safety role that protects workers from some of the most dangerous conditions found in public works operations. The competent person must understand soil behavior, excavation requirements, protective systems, and hazard recognition, and must also have the authority to stop the job immediately.
When a trained and empowered competent person is present, excavation work becomes significantly safer and far more compliant with OSHA regulations.