Oshlack v Rous Water

The case of Oshlack v Rous Water involved the respondents' decision to add fluorine to the water supply through the construction and operation of several fluoridation plants. The applicant, Oshlack, sought answers to several preliminary questions concerning the applicability of specific sections of the Environmental Planning and Assessment Act 1979 (EP&A Act) to these decisions. The High Court of Australia was tasked with determining whether the respondents were required to comply with the provisions of ss 111 and 112 of the EP&A Act when approving the fluoridation plants.

The primary legal issues in this case revolved around the interpretation and application of ss 111 and 112 of the EP&A Act. Specifically, the Court had to determine whether the respondents were required to consider the impacts on human health and the environment of adding fluorine to the water supply when approving the construction and operation of the fluoridation plants. Additionally, the Court needed to assess whether the respondents were required to comply with s 112 of the EP&A Act, which pertains to the preparation of an Environmental Impact Statement (EIS) in certain circumstances.

In its decision, the Court held that the respondents were indeed required to comply with s 111 of the EP&A Act, which mandates the consideration of the environmental impacts of a proposed action. However, the Court found that the respondents were not required to comply with s 112, which pertains to the preparation of an EIS, as the fluoridation plants did not meet the criteria for requiring an EIS under the EP&A Act. The Court also clarified that the First Respondent was only required to comply with s 111 in relation to the plants that were the subject of the direction to add fluorine to the Richmond Valley Water Supply.

In light of the Court's findings, the High Court answered the preliminary questions as follows: the First Respondent was required to comply with s 111 but not s 112 of the EP&A Act, except in the case of the plants subject to the direction to add fluorine to the Richmond Valley Water Supply; and the Second Respondent was required to comply with both ss 111 and 112 of the EP&A Act. This decision provides important guidance on the application of the EP&A Act to the approval of fluoridation plants and the consideration of their potential environmental impacts.