This paper discusses a test program at the Toho Water Authority's Harmony Water Treatment Facility (WTF) located in southeast Florida's Osceola County, that was designed to assess feasibility and operational constraints and pretreatment requirements. More specifically, the tests were used to: characterize water quality in the raw, pretreated, permeate, and concentrate streams; assess fouling and scaling potential of existing wells using conventional membrane pretreatment; characterize chemical cleaning frequency using demonstrated performance trends; and, identify constraints and conceptual operating conditions for possible future full-scale implementation. Testing was conducted at a temporary pilot facility mobilized at the Harmony WTP adjacent to the Water Reclamation Facility (WRF). Source water was supplied from two groundwater wells. The pilot facility was operated using the existing groundwater wells for source water. Membranes were investigated with varying molecular weight cut-off (reverse osmosis to "loose" softening spiral-wound membranes), conventional pretreatment comprising cartridge filtration and chemical pretreatment, and operation with and without mineral acid. The membranes tested had approximate salt rejection capabilities of 20, 85 and 98-percent. A broad array of membrane types achieved the goal of identifying a membrane that was capable of lowering TOC with minimal salt rejection. Membrane media and test conditions used are summarized. Includes 2 references, tables, figures.