Arizona Groundwater Management Act (1980)
Arizona passed the Groundwater Management Act after decades of unregulated pumping drained aquifers beneath Phoenix and Tucson. It created Active Management Areas where new farms were capped, new subdivisions had to show a 100-year assured water supply, and existing users were grandfathered with rights that could be bought and sold.
New irrigated agriculture in the management areas largely stopped; developers had to document future water.
Created a market in transferable groundwater rights, including Type II industrial rights from closed factories and mines.
The 1980 act is why the Legacy Park lake cannot use municipal tap water and why Vestar can instead buy Type II industrial rights on the open market.
