Lahontan GeoScience updated the USGS groundwater flow model for Honey Lake Valley, Washoe County, Nevada to assess the impact of extracting groundwater to supply the Reno area. The MODFLOW computer model of Honey Lake Valley was enlarged to cover more of the basin and the MT3D computer model added to evaluate solute transport of groundwater quality. Groundwater withdrawals were simulated and the impact to groundwater flow and quality predicted using the modified models as part of the Environmental Impact Analysis of the proposed project.