Understanding the Arizona’s 100-Year Water Rule

Arizona operates one of the strictest water planning systems in the United States through the Assured Water Supply Program.

100-Year Assured Water Supply

Cities in Active Management Areas (AMA) must demonstrate a 100-year water supply before new subdivisions can be approved.

·       Physically available water

·       Legally permitted water rights

·       Adequate water quality

·       Continuous supply for at least 100 years

Source: https://www.azwater.gov/aaws

Prescott Active Management Area (AMA)

Prescott is part of the Prescott AMA, created under the 1980 Groundwater Management Act, to regulate groundwater use.

Source: https://www.azwater.gov/ama

AMA Map: https://prescott-az.gov/wp-content/uploads/2023/12/12.14.23-Prescott-Active-Management-Area.pdf