Canada vs. Federal OSHA Hearing Conservation: Employer Guide to COHSR, Provincial OH&S, and CSA Standards

There is no single “Canadian OSHA.” Hearing conservation in Canada is regulated by two parallel systems: the federal Canada Occupational Health and Safety Regulations (COHSR) for the roughly 6% of the workforce in federally regulated industries (interprovincial transport, banking, telecommunications, federal Crown corporations, and similar), and the occupational health and safety regulator of each province or territory for everyone else — 13 separate jurisdictions, each with its own noise rule. This guide maps how Canadian federal and provincial requirements compare to US Federal OSHA 29 CFR 1910.95, with a province/territory matrix and a practical guide for US employers operating north of the border (and Canadian employers operating south of it).

Why There Is No Single “Canadian OSHA”

The Canada Labour Code Part II and its implementing regulation, the Canada Occupational Health and Safety Regulations (SOR/86-304), only apply to federally regulated workplaces. The federal head of power covers interprovincial and international transport (rail, air, marine, trucking that crosses a provincial boundary), banking, telecommunications and broadcasting, postal services, federal Crown corporations, grain elevators, uranium mining and processing, and on-reserve First Nations employers. This is approximately 6% of the Canadian labour force, depending on how the count is drawn.

Every other workplace — the other ~94% — is regulated by the occupational health and safety statute of the province or territory in which the work is performed. There are 10 provinces and 3 territories, each with its own OH&S act and its own noise regulation. A hearing conservation program that is compliant in Ontario is not automatically compliant in Quebec, Alberta, or British Columbia. This is structurally similar to the US state-plan system, but more complete: there is no federal Canadian floor that applies to provincially regulated workplaces the way US Federal OSHA backstops state-plan states.

Federal COHSR Part VII vs US OSHA 1910.95

The closest direct comparison is between US Federal OSHA 29 CFR 1910.95 and the federal Canadian rule: COHSR Part VII (Levels of Sound), sections 7.1–7.8. Both regulate occupational noise exposure with parallel structural elements — a daily noise exposure limit, hearing protection, hazard communication, and an obligation to control noise at source where reasonably practicable — but the numeric criteria differ in ways that matter for dose calculation.

The numeric differences that matter most

Two differences drive most of the practical disparity:

• 3 dB exchange rate. COHSR Part VII, like most Canadian jurisdictions and like NIOSH, uses the equal-energy principle. A worker exposed to 90 dBA for 8 hours has a federal Canadian Lex,8 of 90 dBA — well above the 87 dBA ceiling. Under US OSHA the same exposure equals exactly the 90 dBA PEL (100% dose). The Canadian dose calculation is more protective and will frequently flag exposures that pass under OSHA.
• 87 dBA ceiling, not 90. COHSR section 7.4 sets the exposure ceiling at 87 dBA Lex,8 — 3 dB lower than the US PEL. Combined with the 3 dB exchange rate, federally regulated Canadian workplaces operate on a tighter noise budget than US OSHA workplaces.

Province / Territory Matrix

The following table summarizes the noise exposure criteria for all 13 provincial and territorial jurisdictions, plus the federal COHSR rule for comparison. Action levels and exposure limits are given in dBA Lex,8 (the 8-hour equivalent sound level) unless otherwise noted. Audiometric testing posture indicates whether the regulation explicitly requires audiometric testing as part of the hearing conservation program (M = mandatory; R = recommended or required where practicable; SBP = standard of best practice via CSA Z1007).

A few notes on the matrix:

• “Action level” vs “exposure limit.” In most Canadian jurisdictions the action level and the exposure limit are the same number (85 dBA Lex,8), which is different from US OSHA where there is a 5 dB gap between the 85 dBA action level and the 90 dBA PEL. In Canada, reaching 85 dBA both triggers the program and requires the employer to reduce exposure below that level where reasonably practicable.
• BC and Manitoba assess at lower thresholds. BC requires noise assessments starting at 82 dBA, Manitoba at 80 dBA. The 85 dBA program trigger still applies, but the assessment obligation begins earlier — meaning monitoring must catch exposures before they reach the action level.
• “Where reasonably practicable” is a load-bearing phrase in several provincial regulations. It does not mean “optional.” It means the employer must demonstrate, in writing, that audiometric testing or a specific control measure was not feasible — and inspectors will probe the justification.

CSA Z94.2, CSA Z107.56, and CSA Z1007 — The Three Standards That Run Through Every Canadian Jurisdiction

Unlike the US system, where OSHA writes its own technical appendices for HPD attenuation (Appendix B) and measurement (Appendix D), Canadian regulators almost universally incorporate Canadian Standards Association (CSA) standards by reference. Three CSA standards do most of the work:

• CSA Z94.2 — Hearing Protection Devices: Performance, Selection, Care, and Use. The Canadian equivalent of the US ANSI S3.19 / S12.6 NRR framework. Z94.2 uses an A-B-C classification system (Class A for the highest-attenuation HPDs, Class C for the lowest) and provides selection guidance based on measured exposure. Every Canadian noise regulation we have found cites Z94.2 (current edition) for HPD selection and use.
• CSA Z107.56 — Measurement of Noise Exposure. The Canadian equivalent of OSHA 1910.95 Appendix D. Z107.56 specifies how to conduct noise surveys, dosimetry, and SLM measurements, including instrument calibration, measurement strategy, and reporting. COHSR Part VII and every provincial regulation we reviewed cite Z107.56 (current edition) for noise measurement.
• CSA Z1007 — Hearing Loss Prevention Program (HLPP) Management. Z1007 is the program-management standard — the Canadian counterpart to a comprehensive 1910.95 program design. Z1007 covers responsibilities, noise hazard identification, controls hierarchy, HPD program, audiometric testing program (including baseline, annual, STS criteria, and follow-up), training, recordkeeping, and program evaluation. Most provincial regulators reference Z1007 as the recognized standard of care for hearing conservation, even where the regulation itself is sparser.

Cross-Border Employer Guidance

US employers with Canadian operations

• Identify the regulator first. Determine for each Canadian site whether the operation is federally regulated (COHSR) or provincially regulated. Most US-headquartered employers in Canada are provincially regulated — manufacturing, retail, healthcare, construction.
• Re-run noise dose calculations under a 3 dB exchange rate. Dosimeter software can output OSHA (5 dB, 90 dBA criterion) and ISO/NIOSH/Canadian (3 dB, 85 dBA criterion) doses from the same measurement session. Do this before relying on US monitoring data for a Canadian compliance file.
• Re-classify HPDs under CSA Z94.2. A US NRR rating is not the same as a CSA Z94.2 Class. Most major manufacturers publish both. Your HPD selection documentation for a Canadian site should reference the Z94.2 Class, not the US NRR.
• Audiometric testing. Even where the provincial regulation does not strictly mandate annual audiograms, the practical standard of care (CSA Z1007, regulator guidance) is baseline + annual. Run the same audiometric program you would in the US and you will exceed almost every provincial minimum.
• Watch Quebec. The 2023 RSST update is the single biggest cross-border risk for US employers with operations in Quebec.

Canadian employers with US operations

• OSHA 1910.95 is, in most numeric respects, less stringent than your Canadian program. A Z1007-compliant program is generally a 1910.95-compliant program.
• State-plan states may add requirements. California (Cal/OSHA), Oregon, and Washington have hearing conservation elements that exceed federal OSHA — including construction audiometric testing and CAOHC technician certification in OR and WA. See our Federal OSHA vs. State Plan OSHA guide.
• NRR derating. US OSHA Appendix B requires NRR derating for HPD adequacy calculation. Document this for US sites even if your Canadian program uses CSA Z94.2 Class selection.
• Recordkeeping window is different. US OSHA requires audiometric records for the duration of employment; CSA Z1007 recommends retention for the working life of the worker (effectively the same, but the recordkeeping documentation should reference the US standard for US sites).

Frequently Asked Questions