Occupational Health and Safety Act, R.S.O. 1990, c. O.1 (Ontario)
Act, published by Legislative Assembly of Ontario, Consolidated from 27 November 2025 to the e-Laws currency date (last amendment 2025, c. 13, Sched. 4), read with O. Reg. 420/21 as consolidated from 1 January 2024. CA-ON.
7 obligations, clause by clause.
7 obligations transcribed from the Act, each held with its clause, the window it sets and what missing it costs.
| Where it is written | The obligation | Window | If missed | Disease |
|---|---|---|---|---|
| s 51(1), 66; O. Reg. 420/21 s 1(1) | Notify an inspector, and the joint health and safety committee, health and safety representative and trade union, immediately when a person is killed or critically injured at a workplaceheld in the safety incident register | none set | an offence | Lapsed compliance |
| s 51(1), 66; O. Reg. 420/21 s 3, 7 | Send a Director, and the committee, representative and trade union, a written report within 48 hours after a person is killed or critically injured at a workplaceheld in the safety incident register | 48 hours | an offence | Lapsed compliance |
| s 51(2), 66 | Leave the wreckage and scene of a fatality or critical injury undisturbed until an inspector permitsheld in the safety incident register | none set | an offence | Lapsed compliance |
| s 52(1)-(3), 66; O. Reg. 420/21 s 1(1), 3 | Give written notice within 4 days when a worker is disabled from usual work or needs medical attention because of an accident, explosion, fire or workplace violenceheld in the safety incident register | 4 days | an offence | Lapsed compliance |
| s 53(1), (2)(a), 66; O. Reg. 420/21 s 4 | Give a Director, and the committee, representative and trade union, written notice within 2 days of a prescribed dangerous occurrence at a project siteheld in the safety incident register | 2 days | an offence | Lapsed compliance |
| OHSA s 53.1; O. Reg. 420/21 s 5 | Supplement the report or notice with an engineer's written opinion on the cause within 14 days after a failure of works, a structure, an engineered excavation wall or a craneheld in the safety incident register | 14 days | an offence | Lapsed compliance |
| O. Reg. 420/21 s 6 | Keep a copy of every written report or notice under sections 51 to 53.1 for at least 3 yearsheld in the safety incident register | 36 months | an offence | Lapsed compliance |
How it works in Ontario: Construction law in Ontario, Construction safety, Notice of project, Incident notices, Other site notices.
What this page is, and is not.
It is the clause text this library holds for this document, with the window and the consequence. It is not legal advice, and it is not a substitute for reading the document you signed.
No library of law is complete, and Demiton never says this one is. An obligation the library does not hold, and you did not add, is not protected. You can add your own to any job.
Common questions
What does Occupational Health and Safety Act, R.S.O. 1990, c. O.1 (Ontario) s 51(1), 66; O. Reg. 420/21 s 1(1) require?
Notify an inspector, and the joint health and safety committee, health and safety representative and trade union, immediately when a person is killed or critically injured at a workplace. Missing it: an offence. The clause sets no day count. Demiton watches it against the safety incident register.
What does Occupational Health and Safety Act, R.S.O. 1990, c. O.1 (Ontario) s 51(1), 66; O. Reg. 420/21 s 3, 7 require?
Send a Director, and the committee, representative and trade union, a written report within 48 hours after a person is killed or critically injured at a workplace. Missing it: an offence. The window is 48 hours. Demiton watches it against the safety incident register.
What does Occupational Health and Safety Act, R.S.O. 1990, c. O.1 (Ontario) s 51(2), 66 require?
Leave the wreckage and scene of a fatality or critical injury undisturbed until an inspector permits. Missing it: an offence. The clause sets no day count. Demiton watches it against the safety incident register.
What does Occupational Health and Safety Act, R.S.O. 1990, c. O.1 (Ontario) s 52(1)-(3), 66; O. Reg. 420/21 s 1(1), 3 require?
Give written notice within 4 days when a worker is disabled from usual work or needs medical attention because of an accident, explosion, fire or workplace violence. Missing it: an offence. The window is 4 days. Demiton watches it against the safety incident register.
What does Occupational Health and Safety Act, R.S.O. 1990, c. O.1 (Ontario) s 53(1), (2)(a), 66; O. Reg. 420/21 s 4 require?
Give a Director, and the committee, representative and trade union, written notice within 2 days of a prescribed dangerous occurrence at a project site. Missing it: an offence. The window is 2 days. Demiton watches it against the safety incident register.
Does Demiton hold every obligation in Occupational Health and Safety Act, R.S.O. 1990, c. O.1 (Ontario)?
No library of law is complete, and Demiton never says this one is. An obligation the library does not hold, and you did not add, is not protected. You can add your own to any job.