In September 2011, Pima Association of Governments released the "Central Arizona Groundwater Replenishment District Membership in the Tucson Active Management Area" report. The report contains data current to 2009. The purpose of the report is to provide regional managers and the public with updated information on Central Arizona Groundwater Replenishment District (CAGRD) membership in the context of its impact on Assured Water Supply (AWS).
Analysis includes calculations of obligated replenishment for members, membership growth trends and location of recharge facilities. The Central Arizona Project (CAP) also has used this report to address boundary reconciliation issues. Several concerns arise when considering the widespread dependence on the GRD to meet AWS requirements.
These concerns include the dependence of CAGRD on excess CAP supplies, which are decreasingly available, and that the recharge will not benefit areas where groundwater is actually pumped, which has impacts on subsidence and localized water availability. PAG's analysis is available in the report and maps linked below in addition to accompanying datasets in raw format from PAG and on the Pima County Map Guide website for interactive viewing.