Oshlack v Rous Water

The appellant, Mr. Oshlack, sought judicial review of a decision by Rous Water to construct and operate fluoride dosing plants. The primary judge dismissed Mr. Oshlack's application, and he appealed this decision to the Court of Appeal of New South Wales.

The central legal issues before the Court of Appeal were whether the primary judge erred in dismissing Mr. Oshlack's application for judicial review, and whether Rous Water had constructively failed to exercise its jurisdiction by labouring under a misconception about the duty imposed on it as a decision-maker. The appeal also concerned the costs discretion exercised by the primary judge.

The Court of Appeal found that the primary judge had not erred in dismissing the application. It was held that Rous Water had not constructively failed to exercise its jurisdiction, as there was no evidence that it had misunderstood its legal duties. The court affirmed the principles of administrative law concerning the grounds for judicial review and the circumstances in which a decision-maker might be found to have constructively failed to exercise their jurisdiction.

Consequently, the Court of Appeal dismissed the appeal and ordered Mr. Oshlack to pay the respondents' costs. Leave was granted to the appellant to amend Ground 1 of his notice of appeal.