Carollo was retained by the District of Cuyama to evaluate feasible arsenic treatment processes and prepare documents necessary for the United States Department of Agriculture (USDA) funding review process. The District draws groundwater from one location containing arsenic at relatively high levels, often approaching the current arsenic Maximum Contaminant Level of 50 ppb. The groundwater also has moderate amounts of iron and a total dissolved solids (TDS) level exceeding the secondary MCL of 500 mg/L. By a desktop analysis, it was determined that a coagulation/filtration process would remove arsenic at less than $1.00 per gallon when complete.