This slide presentation outlines information on a project to design and construct a water treatment pilot plant on the middle St. Johns River to evaluate the optimum treatment technologies, design criteria, and costs to use seasonally brackish surface water as an alternative source. Information is also outlined on evaluating the necessary pretreatments and reverse osmosis membranes, and evaluating surface water discharge for the concentrate stream. Topics covered include: cost benefit analyses; processes tested; pilot testing statistics; pretreatment data and conclusions; and, membrane data analysis.