Which of the following is NOT one of the four types of water supply available in Arizona?

The designation of stormwater as not being one of the four primary types of water supply available in Arizona is accurate. Arizona's water supply categorization primarily includes effluent, groundwater, surface water (which can sometimes be understood as lake water), and renewable water supplies such as Colorado River water.

Effluent refers to treated wastewater that can be reused for various purposes, including irrigation. Groundwater is a critical resource in Arizona, extracted from aquifers throughout the state. Surface water includes natural bodies of water, such as rivers and lakes, which contribute to the state's water supply. While stormwater is often managed and may contribute to water resources in various contexts, it is not classified as a primary type of water supply in Arizona's water management framework. This distinction is important as it reflects the structured approach Arizona takes in addressing its unique water resource challenges and planning for sustainable use.