What distinguishes an assured water supply from an adequate water supply?

The distinction between assured water supply and adequate water supply lies primarily in the specific regulatory requirements attached to them, particularly within Arizona's Active Management Areas (AMAs). An assured water supply represents a legally defined and sustainable water supply that is guaranteed to be available for new development. To obtain this designation, a developer must provide evidence of a reliable water source for 100 years into the future and demonstrate the capacity to meet the projected demands of the development.

Before construction begins in AMAs, developers are required to prove that they have an assured water supply. This is a crucial step in the planning and development process, ensuring that new projects contribute to sustainable water management within regions that face stringent water resource challenges.

In contrast, an adequate water supply may meet immediate needs but does not provide the long-term assurance required in these areas. It might not have the same regulations or long-term sustainability criteria, making it less stringent compared to the assured water supply standards. This understanding is essential for developers working within Arizona's complex water management framework.