R v Sault Ste Marie

R. v. Sault Ste. Marie

[1978] 2 SCR 1299 | 1978 CanLII 11 (SCC)
Supreme Court of Canada — Dickson J. (for the Court)

Background

The City of Sault Ste. Marie contracted Cherokee Disposal to manage and dispose of municipal waste at a site bordering Cannon Creek, feeding into the Root River. The disposal site had natural freshwater springs that were submerged during operations. Over time, waste seeped into the groundwater and contaminated Cannon Creek and the Root River system, a waterway connected downstream to major drinking water sources.

Both the City and Cherokee were charged under s. 32(1) of the Ontario Water Resources Commission Act, which prohibited discharging or depositing (or causing/permitting the discharge or deposit of) material into water in a way that may impair its quality.

The City was initially cleared on the theory that Cherokee was an independent contractor. On a trial de novo appeal, the City was convicted on the basis the offence was strict liability. The Supreme Court used the case to rebuild Canadian regulatory offence doctrine into a coherent framework.

Issues

1. How should regulatory/public welfare offences be classified under Canadian law?
2. Does s. 32(1) require mens rea, or is it strict/absolute liability?
3. What defences are available where mens rea is not required?

The Three Categories of Offences

Dickson J. rejected the old “mens rea vs. absolute liability” binary and held Canadian law recognizes three categories:

Category 1 — True Criminal Offences (Mens Rea)
The Crown must prove subjective intent/knowledge beyond a reasonable doubt. No “no-fault” defence exists because guilt turns on what was in the accused’s mind.

Category 2 — Strict Liability Offences (Regulatory/Public Welfare)
The Crown proves the prohibited act (actus reus). The accused is not automatically convicted: they may avoid liability by establishing a no-fault defence. If no defence is made out, conviction follows.

Category 3 — Absolute Liability Offences
Proof of the act is conclusive. No defence exists. Dickson J. emphasized this is harsh and should not be presumed without clear legislative intent.

The No-Fault Defence

The cornerstone of Sault Ste. Marie is that strict liability offences permit a no-fault defence, typically by:

1) Due Diligence
On a balance of probabilities, the accused shows they took all reasonable steps to avoid the offence. Not perfection — reasonable precautions proportionate to the risk.

2) Reasonable Mistake of Fact
The accused reasonably believed a mistaken set of facts which, if true, would make the act innocent. The belief must be honest and objectively reasonable.

Note: Officially induced error was recognized later (e.g., Lévis (City) v. Tétreault, [2006] 1 SCR 420).

Determining the Category

Where legislation is silent on fault, courts examine:

• the overall regulatory pattern
• the subject matter
• penalty severity
• precision of language

Absent express language imposing absolute liability, there is a presumption in favour of strict liability. Absolute liability should not be inferred casually.

Applying that approach, the Court held s. 32(1) created a strict liability offence. The City was entitled to attempt a no-fault defence on remand.

Decision

The appeal was allowed in part. The conviction was set aside and a new trial ordered to allow the City to advance a no-fault defence. The offence was confirmed as strict liability.

Key Takeaways

• Sault Ste. Marie is the foundational authority for classifying offences into mens rea, strict liability, and absolute liability.
• Strict liability offences allow a no-fault defence (due diligence or reasonable mistake of fact), proven by the accused on a balance of probabilities.
• Where fault is silent, courts presume strict liability rather than absolute liability.
• This framework underpins POA, OHSA, environmental, licensing, and by-law prosecutions across Canada.

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