Tepko & Ors v Water Board

The High Court of Australia considered an appeal by Tepko and others against a decision of the Supreme Court of New South Wales. The dispute concerned the validity of certain charges imposed by the Water Board under the *Water Board (Charges) Act 1979* (NSW). The appellants, who were owners of land within a drainage district, challenged the imposition of drainage rates, arguing that the Water Board had failed to comply with statutory requirements in levying these charges.

The central legal issues before the High Court were whether the Water Board had validly exercised its power to levy drainage rates and, if not, what the consequences of such invalidity would be. Specifically, the court had to determine if the Water Board had followed the correct procedures for the assessment and imposition of the rates, and whether any alleged non-compliance rendered the rates void or merely voidable. The interpretation of various provisions within the *Water Board (Charges) Act 1979* and related legislation was crucial to resolving these questions.

The High Court, in a joint judgment, found that the Water Board had indeed failed to comply with certain mandatory procedural requirements stipulated in the Act when levying the drainage rates. The court held that these failures were not mere irregularities but amounted to a fundamental breach of the statutory scheme, rendering the rates invalid from their inception. The reasoning emphasised the importance of strict adherence to statutory procedures when public authorities exercise powers that affect the rights and property of individuals. The court applied principles of administrative law concerning the validity of statutory discretions and the consequences of procedural impropriety.

Consequently, the High Court allowed the appeal, setting aside the decision of the Supreme Court and declaring the drainage rates imposed by the Water Board to be invalid. The appellants were successful in their challenge.