Who primarily controls the regulations related to water usage in Arizona?

The primary control of regulations related to water usage in Arizona lies with the State of Arizona. This is due to the state's authority to manage and allocate water resources, which is essential in a region where water is a limited and precious commodity. Arizona has specific laws and policies in place, such as the Arizona Groundwater Management Act, which governs groundwater usage to promote sustainability and balance the state's water demands.

While local municipalities can have regulations concerning water use within their jurisdictions, they operate under the broader framework established by state law. The federal government does have laws impacting water resources, primarily through environmental protection and interstate water agreements, but it is not the primary regulator of water usage within the state. Private entities may play roles in water management and distribution, especially in specific sectors or local contexts, but they do not control the overarching regulations governing water usage in Arizona. Thus, the state's authority is key in managing both surface and groundwater resources effectively.