Ontario’s New Occupational Exposure Registry: What You Need to Know

What Ontario’s new exposure registry for hazardous substances means for employers – records, prevention, and practical next steps.

Ontario’s new Occupational Exposure Registry (OER) is a big step toward something safety leaders have wanted for years: better continuity of exposure history across a worker’s career—especially for hazards where health effects can show up long after the job is done.

The registry includes a secure online self-tracker where workers can document exposures to 11 designated hazardous substances (the examples cited publicly include asbestos, silica, lead, and mercury). Workers can log how the exposure happened and what controls were in place—like ventilation, training, and PPE—then receive a confirmation email and a downloadable record for their own files. Participation is voluntary and worker-driven.

Why This Matters

From a CrossSafety perspective, the exposure to hazardous substances registry will change expectations—informally at first, then more formally—around what “good” looks like in occupational hygiene and prevention programs.

A worker-controlled record can be used in medical conversations years later and influence how organizations think about exposure documentation today. Ontario has also said the Chief Prevention Officer will use the information to support prevention efforts, with aggregated/de-identified data informing strategies (and that it’s not intended for enforcement).

What Employers Should Do Next

If you’re responsible for health and safety, treat the exposure to the hazardous substances registry as a signal to tighten up the basics:

• Confirm your hazard inventory is current (processes, materials, and non-routine tasks).
• Validate controls: ventilation performance, housekeeping, substitution decisions, and PPE suitability.
• Strengthen training so workers understand when an exposure is likely, what “good control” looks like, and how to report concerns early.
• Improve your documentation trail: sampling results (where applicable), maintenance records, respirator programs/fit testing, and supervisor verification.
• Make it easy for workers to speak up—because the registry is ultimately about awareness and prevention, not paperwork.

Our Bottom Line

A registry doesn’t prevent exposure by itself—but it can push the system toward better visibility and earlier action on chronic, “quiet” hazards. If you want help pressure-testing your exposure controls (and the training and documentation behind them), CrossSafety can support occupational hygiene assessments, program updates, and practical workforce training aligned to your real worksites

If you’re wondering how the hazardous substances registry could affect your business, reach out to CrossSafety to talk to an expert and get clear, practical next steps.