Which statement best describes the regulation of groundwater in Arizona?

The regulation of groundwater in Arizona is best described as heavily regulated due to the state's ongoing efforts to manage its limited water resources efficiently and sustainably. Arizona has adopted a comprehensive framework of laws and regulations to govern groundwater use, primarily under the Groundwater Management Act of 1980. This act was implemented to control the depletion of groundwater supplies, particularly in areas experiencing significant over-extraction.

In designated active management areas (AMAs), the regulations include strict limitations on groundwater extraction, mandatory reporting for large-scale users, and requirements for conservation and replenishment efforts. The objective of these regulations is to achieve a sustainable water supply while balancing competing demands from various users, including municipalities, industries, and agriculture.

In contrast, the other statements suggest a lack of regulation or limited regulation, which does not accurately reflect the comprehensive legal framework established to protect and manage groundwater resources in Arizona.