The appellants appealed a trial judgment finding them liable for a fuel oil spill at the respondents' home.
The trial judge found that the appellants negligently failed to identify that the respondents' fuel oil tank, which was labelled for indoor use, was installed outdoors, and failed to tag it as non-compliant.
The appellants argued the trial judge erred by applying the 'material contribution' test for causation instead of the 'but for' test.
The Court of Appeal dismissed the appeal, holding that while the trial judge articulated the wrong test, she effectively applied the 'but for' test by finding the spill would not have occurred if the appellants had fulfilled their regulatory obligations.
The Court also upheld the trial judge's apportionment of liability, finding of contributory negligence, and damages assessment.