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Hydrologic Unit Area (HUA) Projects exist through a joint effort of the University of Arizona Cooperative Extension, United States Department of Agriculture (USDA) - Natural Resources Conservation Service (NRCS), Farm Service Agency (FSA), and local producers. The USDA funds the HUA Projects as part of the 1990 Water Quality Initiative, a nationwide project created to provide education helping to minimize potential impacts of agricultural practice on groundwater quality.

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This document located at:
http://cals.arizona.edu/cropsHUAreport.htm