NID Regional Water Supply Project

The western Placer County region including the City of Lincoln have been among the fastest residential and commercial growth areas of California for the last several years, with no slowdown in the foreseeable future. The increased treated water demand associated with the growth is requiring domestic water purveyors in the area, including the Nevada Irrigation District (the District), and the City of Lincoln, to increase treated water production capacity to continue to provide treated water service. The District’s service area includes portions of Placer, Nevada and Yuba counties. A portion of the service area overlaps the City of Lincoln’s sphere of influence (SOI). The City of Lincoln’s 2005 General Plan Update estimates that approximately 20,000 homes will be constructed within the portion of the District’s service area that overlaps the City’s SOI over the next fifty years.

To address the projected demand, the District and the City of Lincoln have joined in a cooperative study to identify a site for a water treatment plant. The new treatment plant will serve the portion of the City of Lincoln within the District’s service area, as well as unincorporated areas outside the City of Lincoln. The addition of the new water supply to the City of Lincoln, in conjunction with the City’s groundwater well network, and the service from placer County Water Agency will provide the City treated water capacity through the planned build out included in the 2005 General Plan Update.

The goal of the project was to identify the most appropriate site for the water treatment plant. In addition to the water treatment plant itself, several related improvements and facilities were identified and included in the overall evaluation. Examples include primary and back up raw water supplies, conveyance pipelines/canals and storage facilities. Therefore the water treatment plant site evaluation becomes a comparison of various combinations of treatment plant sites and supporting facilities. During the study, it became apparent that phasing of improvements would be necessary to finance and implement the project.