As shown in Figure 1 the Valley Sanitary District Wastewater Treatment Plant (VSD) is located in the Colorado River Basin Region of Southern California. Effluent from this 8.5 mgd wastewater treatment plant discharges to the Coachella Valley Storm Channel (CVSC), which ultimately drains to the Salton Sea, the largest lake in California.
In the past, a balance between inflow and evaporation has sustained the Sea. However recently (October of 2003), in an attempt to reduce California’s allotment of Colorado River Water the Imperial Irrigation District agreed to transfer some of its water to San Diego. Unfortunately for the Salton Sea, that transfer would have significantly reduced inflows into the Sea.