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ECCVWSD has purchased the non-tributary groundwater resources of the Willows Water District contingent on the findings of Water Court. The cost of these water rights was $] 8,500,000. Both water and funds are currently in escrow until the Water Court rules on the terms of the proposed purchase. Approximately 5,800 acre-feet per year of adjudicated non-tributary groundwater are associated with the north and south well fields in the Willows Water District. ECCVWDS is constructing a 20 MGD pipeline along a ]4 mile alignment that follows E-470 at an estimated cost of over $30,000,000. The District recently completed a detailed assessment of wastewater reuse opportunities ( Wastewater Reuse Assessment, CH2M HILL, 2000). At this time, the District operates a wastewater collection system but has no treatment system - all sewage is collected and is pumped or flows through the City of Aurora's sewere system for treatment at the Metro Wastewater Treatment Plant before discharge to the South Platte River north of the metropolitan area. No return flow credits are available to ECCVWSD under this agreement. The District considered a series of alternatives for capturing sewage effluent from one or more of the drainage basins and treating that sewage for either indirect potable reuse or non-potable reuse on outdoor areas. The indirect potable reuse options included advanced wastewater treatment to produce drinking water quality and then injection into the Cherry Creek alluvium or the deep aquifer system. Recovery wells would pump co-mingled groundwater for delivery to the potable water distribution system. Costs of these alternatives ranged from $20,000 per acre-foot up to $38,000 per acre- foot if seasonal storage at Reuter-Hess Reservoir was included. The nopotable reuse alternatives considered operating an irrigation season reuse program with treated effluent being used for irrigation of parks and open space areas. A dual distribution system for delivery of treated effluent to individual residences was not considered. At build-out, this program could develop up to 1,300 acre-feet of reuse water. Use of ACWW A's membrane plant as well as a new District-owned plant were considered. A new seasonal storage reservoir of3,000 acre~feet would be required to meet system demands. Present value costs of non potable reuse programs ranged from $20,000 per acre-foot to $43,000 per acre-foot depending on configurations, operating approaches and the yield to be developed. At this time, the District is considering an alluvial recovery system on lower Piney Creek as a means of reclaiming lawn irrigation return flows. Up to 990 acre-feet of alluvial groundwater could be recaptured (at build-out conditions) for reuse on open space areas along the Piney Creek greenway. It is estimated that the District will have capital expenditures of $120 -130 million through the year 20] 0 in well development costs if non-tributary groundwater resources alone are developed to meet demands. Figure E-2 illustrates the scheduled additions of water supply sources along with the projected municipal water demand that is to be met by the District.