This report has been prepared to meet the requirements of Section 319 of the federal Clean Water Act and Section 49-203 of the Arizona Environmental Quality Act. The final nonpoint source management plan for Arizona will be treated as an amendment to the State Water Quality Management Plan.

"This Assessment Report describes the geographic location and focus of nearly 100 studies of environmental water needs in Arizona, using all relevant sources. It identifies environmental water needs for some rivers and denotes the Arizona rivers where we know little. Defining environmental water needs is the first critical step in the broader process of securing and addressing environmental flows. Through this Assessment Report and the companion Arizona Environmental Water Needs Methodology Guidebook, we aim to clearly describe the science of environmental water demands"--Page 1.