The economy is broadly divided into Primary (extraction), Secondary (manufacturing), and Tertiary (services) sectors. Water supply involves the collection, purification, and distribution of water to consumers, which is a service. While the infrastructure might involve construction (secondary) and the source might be natural (primary), the provision of water to end-users is considered a utility service, falling under the Tertiary sector. The Public Sector option refers to the ownership model (government) rather than the type of economic activity.