Ground Disturbance in Canada — Rules & Damage Prevention

Every dig is a legal event in Canada. Before an excavator breaks the ground, every jurisdiction requires the buried utilities beneath it to be located. Ontario makes the locate request itself a statutory duty, federal rules protect a 30-metre strip around regulated pipelines, and four provinces and territories fix a hand-dig zone of roughly 600 mm around buried lines. This guide covers what ground disturbance means in law, the hazards, the federal and provincial rules, the click-before-you-dig system, and the training behind safe digging.

What is ground disturbance and damage prevention?

Ground disturbance is any work that penetrates or displaces the ground — digging, excavation, trenching, drilling, augering, blasting. Damage prevention is the discipline wrapped around it: locating and protecting the pipes, cables and conduits already buried where you plan to dig. In practice it covers the locate request before the work, the marks on the ground, hand or vacuum exposure near the marked lines, and stop-work and notification of the facility owner if a line is contacted.

The term also has precise legal definitions. Alberta's OHS Code treats ground as disturbed if a "work operation or activity on or under the existing surface results in a disturbance or displacement of the soil" (s. 441); the exception for shallow work applies only where it "does not permanently remove cover". Those carve-outs are cultivation to less than 450 mm over a pipeline and hand-digging no deeper than 300 mm 10.

Federal pipeline law draws a similar line: cultivation under 45 cm near a pipeline is not a "ground disturbance," and neither is other work shallower than 30 cm that leaves the cover over the pipe intact 4. Almost everything deeper or heavier is. Among the provincial and territorial rules in the table below, only Alberta's OHS Code defines the term; elsewhere the excavation rules attach to the work itself — excavating, trenching, drilling — and the table shows what triggers the duty in each jurisdiction. If your work is near buried infrastructure, assume the law considers it a ground disturbance until the definitions say otherwise.

What are the best practices for ground disturbance safety?

The best practices for ground disturbance safety follow the legal sequence: plan, locate and mark, dig by the right method, coordinate, then inspect and report.

• Pre-planning and site assessment: before any excavation or ground disturbance work takes place, plan the work and assess the site to identify potential hazards or risks. This includes obtaining and reviewing relevant documentation, such as utility maps and permits, as well as conducting a physical inspection of the site.
• Locating and marking utilities: before excavation begins, submit a locate request through your one-call service or directly to the facility owner. One-call services include Ontario Dig Authority (formerly Ontario One Call), Utility Safety Partners in Alberta, Info-Excavation in Quebec, BC 1 Call, and their counterparts 25,23,26,27. Then have the buried gas, electrical, water and telecom lines marked on the ground. Locators use tools like electromagnetic induction and ground-penetrating radar.
• Excavation and digging techniques: to minimize the risk of damage to underground infrastructure, excavation work should be done using appropriate techniques and equipment, such as hand digging or vacuum excavation. Workers should also be trained in safe excavation practices, such as avoiding over-digging and backfilling properly.
• Communication and coordination: effective communication and coordination among all stakeholders involved in the project, including contractors, utility companies and regulators, is essential for ensuring that everyone is aware of potential hazards and is working together to prevent damage.
• Post-excavation inspection and reporting: after excavation work is completed, a final inspection should confirm that all underground infrastructure has been properly protected. Any damage or incidents should be reported to the appropriate authorities and documented for future reference.

What are the hazards of ground disturbance?

The hazards of ground disturbance are utility strikes, soil collapse, heavy-equipment accidents, falls and slips, chemical exposure and wildlife encounters:

• Striking underground utilities: digging or excavating can accidentally hit buried gas, water, electrical or telecommunications lines, leading to gas leaks, electrical shocks, water damage and communication disruptions.
• Soil collapse: excavation destabilizes the soil and can cause it to collapse, leading to cave-ins, suffocation or buried workers.
• Heavy equipment accidents: backhoes, bulldozers and excavators cause rollovers, collisions and other accidents when operators are not properly trained or the equipment is not properly maintained.
• Falls and slips: unstable ground, debris, equipment and poor lighting put workers at risk of falls and slips in and around excavations and trenches.
• Chemical exposure: excavating contaminated soil or working close to chemicals stored underground can cause respiratory problems, burns and other health issues.
• Wildlife encounters: snakes, insects and rodents in rural work areas can cause bites, stings and other injuries.

What is the federal legislation for ground disturbance?

Federal law touches ground disturbance twice. For federally regulated employers, the Canada Labour Code sets the general duties 1. The Canada Occupational Health and Safety Regulations make the digging rule specific: "Before the commencement of work on a tunnel, excavation or trench, the employer shall mark the location of all underground pipes, cables and conduits in the area where the work is to be done" (COHSR s. 3.12(1)) 2.

The second layer protects federally regulated pipelines, no matter who is digging. Under section 335 of the Canadian Energy Regulator Act, it is prohibited to "engage in an activity that causes a ground disturbance within the prescribed area" of a pipeline without authorization 3. The regulations define that prescribed area as a strip of land 30 metres on each side of the pipe's centreline 5.

Anyone planning work inside it must make a locate request at least three working days before starting — to the local one-call centre where one exists, or directly to the pipeline company 5. This regime was strengthened by the Pipeline Safety Act of 2015 6 and is administered by the Canada Energy Regulator, the federal agency the CER Act establishes.

Do you have to call or click before you dig?

Yes — locating buried utilities before you dig is a legal requirement everywhere in Canada. The sequence is the same everywhere: submit a locate request through your one-call service or directly to the facility owner, wait out the locate's lead time, and start digging only once the lines are marked. What varies by jurisdiction is the mechanics: who must be contacted, how long a locate takes, and whether the duty starts with any dig or with powered excavation. The table below carries each jurisdiction's own provision, with the lead time where the law fixes one. The practical rule is one sentence: no locates, no digging.

What are the provincial and territorial rules for ground disturbance?

Each jurisdiction sets its own excavation provisions. Find your row below for the instrument that governs your work site and the requirement it imposes before the ground is disturbed.

How close can you dig to buried utilities?

Within roughly 600 mm — about two feet — of a buried line, expose the service by hand or by vacuum, not by machine. Once locates are marked, machines don't get to finish the job, and the working buffer is the same size almost everywhere it's written down. Six provinces and territories fix that buffer in their regulations (their exact provisions are in the table above). Four treat it as a hand-digging zone, two as a zone where the line's operator is notified and the line de-energized.

Alberta builds the same idea into a defined "hand expose zone" around buried facilities, one metre on each side of the locate marks 11. It lets a machine within 600 mm of a buried pipeline only under the direct supervision of the owner's representative 10. Where no regulation gives a number, the Canadian Common Ground Alliance's best practices describe a tolerance zone that is usually one metre on each side of a located line 24.

The reason is the one your locate marks can't fix: the machine is the strike risk. That is why safety risk drops when ground disturbance near marked lines is done with hand tools or vacuum excavation instead of mechanical equipment.

Does the law require workers to be trained before they dig?

Ground disturbance training teaches anyone who digs, or supervises digging, to work the legal sequence: identify what's buried, submit locate requests, read locate marks, respect hand-expose zones, choose the right excavation method, and respond if a line is contacted. It exists because the duties above sit on employers and workers in every jurisdiction, from the federal mark-before-work rule to Ontario's locate-request law. Is a ground disturbance certificate required by law? Not by name: none of the excavation provisions in the table names a course or certificate. What the law requires is that the employer trains workers for the digging they do; which program proves it is decided by employers and clients.

What is the difference between Ground Disturbance 101 and 201?

Ground disturbance training runs on two levels. Worker-level training — often called Ground Disturbance 101, Level 1 or awareness — gives workers on a dig site the knowledge to work safely around buried facilities. Supervisor-level training — Ground Disturbance 201 or Level 2 — is for the people who plan and supervise ground disturbance. In Western Canada it runs on a formal standard: Utility Safety Partners maintains Ground Disturbance 101 and 201 Standards and endorses the training providers that meet them 22. The organization was formed in 2021, when Alberta One-Call, the Alberta Common Ground Alliance and the Joint Utility Safety Team united 23.

Our Ground Disturbance for Workers course is a worker-level awareness program — the equivalent of Level 1. It is not on Utility Safety Partners' lists of endorsed programs, for either the 101 or the 201 Standard 22. If your employer or client requires a certificate from an endorsed provider, at either level, you need a program from those lists. If you work on dig sites and need to understand locates, hand-expose zones and safe digging, a worker-level program is the fit.

Who is responsible for ground disturbance safety?

Employers. Every Canadian OHS regime places the duty to train on the employer. Federally, it runs through the Canada Labour Code's duty to provide "information, instruction, training and supervision necessary to ensure their health and safety at work" 1 and the COHSR's digging rules 2. Provincially, it runs through the OHS acts and the excavation provisions in the table above. Workers carry their side too: follow the trained procedures, respect locate marks and hand-expose zones, and stop work and report if something unexpected is in the ground. In Manitoba, for example, inadvertent contact with an underground facility legally requires immediate evacuation of the excavation site 13.

Who do ground disturbance rules apply to?

Ground disturbance training is for anyone whose work breaks the ground, or who plans and supervises that work, whatever the industry. This is not an exhaustive list:

• Construction: construction workers are frequently involved in excavation and ground disturbance activities, and need the proper techniques for locating and avoiding underground utilities alongside safe excavation practices.
• Oil and gas: drilling, pipeline construction and related work make this industry ground disturbance by definition, so workers must be trained in the safe use of heavy machinery and equipment as well as proper excavation techniques.
• Telecommunications: installing and maintaining underground cables and other infrastructure means working in the same ground as other utilities, which calls for locating, avoidance and safe excavation practices.
• Municipal and government services: water and sewer departments, parks and recreation departments and public works excavate across networks they do not all own, and need the same locating and safe excavation practices.
• Transportation: construction and maintenance of roads, bridges and other infrastructure disturbs ground with heavy equipment, requiring training in both machinery and excavation technique.
• Agriculture: trenching for irrigation systems or other farm infrastructure counts, and deep or pipeline-adjacent farm work falls inside the statutory definitions rather than the shallow-cultivation carve-outs.

Can the awareness level be done online?

Yes — ground disturbance awareness training can be completed fully online. It is theory: definitions, the locate process, marks, hand-expose zones, safe practices.

What must a ground disturbance program cover under the law?

A ground disturbance program should cover what the statutes themselves require:

• What legally counts as a ground disturbance — including the defined carve-outs (shallow cultivation, minor hand-digging) and why they're narrow.
• The locate process — one-call services, locate requests and their lead times, and who must be contacted where no one-call centre operates.
• Reading and respecting locate marks — and the duty to keep facilities identified before work begins.
• Hand-expose zones — the ~600 mm hand-digging buffers and prohibited practices like probing for gas or electrical lines with pointed tools.
• Safe excavation methods — hand digging, vacuum excavation, mechanical limits near marked lines.
• Emergency response to a line strike — evacuation, notification of the facility owner, and stop-work duties.
• The legal framework — your jurisdiction's excavation provisions and the federal pipeline damage-prevention regime.

Does the law set an expiry date for the training?

No Canadian law fixes a validity term for ground disturbance training. What the law fixes is the work itself: locates before every dig, marks kept current, hand-expose zones respected on every job. The eSafetyFirst certificate carries a printed expiry of three years from completion; that is the program's practice, not a legal requirement. Retraining before that date is common practice, set by employers' training policies and their clients' requirements.

Key takeaways

Digging safely in Canada is a sequence, not a guess: know what counts as a ground disturbance, get locates before the work, respect the marks and the hand-expose zones, and train everyone who touches the job. The buried line you can't see is the one the law is written for.