Minister of Water and Sanitation v Sembcorp Siza Water (Pty) Ltd and Another

Sembcorp Siza Water (Pty) Limited (Siza) was a private company that entered into a Water and Sanitation Concession agreement with Ilembe Municipality in 1999 to supply potable water and sanitation services to a portion of the Ilembe region for 30 years. A tripartite bulk water service agreement was then concluded in 2000 between Umgeni Water (a water board), Siza, and Ilembe Municipality. Until 2014, Siza enjoyed annual tariff increases equivalent to those imposed on Umgeni's other municipal customers. In 2014, Umgeni applied a costing model that resulted in a 41.4% tariff increase for Siza and 8.3% for municipalities, citing drought mitigation costs and the need to eliminate cross-subsidization. The Minister of Water and Sanitation reduced the tariff increase to 37.9% and purported to approve it. Umgeni sought to justify the differential on the basis that Siza was a private entity making profits that would not be ploughed back into service delivery. Siza challenged both Umgeni's decision and the Minister's approval on grounds of irrationality, unfair discrimination, and illegality.

• Whether Umgeni Water's decision to impose a differential tariff increase on Siza (37.9% compared to 7.8% for municipalities) was rational
• Whether the Minister of Water and Sanitation had the legal power to approve tariff increases set by water boards
• Whether the differential treatment of Siza constituted unfair discrimination
• Whether the decisions constituted administrative action reviewable under PAJA
• The proper application of the rationality standard in judicial review

The application for leave to appeal was granted. The Minister's appeal was dismissed with costs including two counsel. Umgeni's appeal was upheld. The orders of the High Court and Supreme Court of Appeal were set aside to the extent they referred to Umgeni and replaced with an order dismissing the application to review the tariff set by Umgeni with costs. Sembcorp Siza Water was ordered to pay Umgeni's costs in the Constitutional Court and Supreme Court of Appeal, including costs of two counsel.

The binding legal principles established are: (1) Water boards have statutory power under section 31 of the Water Services Act to set and enforce tariffs for the provision of water services without requiring ministerial approval. (2) The Minister of Water and Sanitation has no power under either the Water Services Act or section 42 of the Local Government Finance Management Act to approve tariff increases set by water boards. Any such approval violates the principle of legality. (3) The rationality standard in judicial review requires courts to determine whether there is a rational connection between a decision and the legitimate purpose sought to be achieved, not to evaluate the cogency or merit of the reasons given for the decision. (4) Differentiation in tariffs does not per se constitute irrationality; as long as there is a rational connection between the differentiation and a legitimate governmental purpose, the differentiation is permissible. Whether less onerous means could have been used is irrelevant to the rationality enquiry. (5) In applying the rationality standard, courts must respect the decisions of administrative agencies and not substitute their own judgment, thereby maintaining the distinction between appeals and reviews.

The Court made several non-binding observations: (1) The distinction between decisional rationality and procedural rationality was clarified - procedural rationality concerns whether the procedure followed could reasonably lead to the attainment of the purpose for which power was conferred, and should not be conflated with procedural fairness. (2) It was noted that in a two-stage or multiple-stage decision-making process, each decision is subject to separate scrutiny and irregularities in a later stage do not necessarily vitiate properly taken earlier decisions. (3) The Court observed that the protection in Biowatch (exempting private litigants from adverse costs orders against the state) does not extend to entities performing public functions on behalf of organs of state - such entities should be treated as organs of state for costs purposes. (4) The Court noted without definitively deciding that it is unclear whether a juristic person can be a bearer of rights under section 9(3) of the Constitution (the equality clause prohibiting unfair discrimination on listed grounds), as the listed grounds suggest the right is enjoyed by natural persons. (5) The majority emphasized that saving R10 million through tariff adjustments need not make a 'material difference' to constitute a rational basis for differentiation.

This case is significant for clarifying the separation of powers between water boards and the Minister of Water and Sanitation in setting water tariffs. It established that water boards have statutory power under section 31 of the Water Services Act to set and enforce tariffs without ministerial approval. The judgment also provides important guidance on the proper application of the rationality standard in administrative law review, emphasizing that courts must assess whether there is a rational connection between a decision and its legitimate purpose, rather than evaluating the cogency or merit of reasons given. The case illustrates the distinction between decisional rationality and procedural rationality, and warns against courts blurring the line between appeals and reviews by substituting their own judgment for that of administrative bodies. It also reinforces the principle of legality - that executive action must be authorized by law and cannot be based on implied or assumed powers. The case has implications for public-private partnerships in water service delivery and the application of differential tariffs to private entities performing municipal functions.