This study involved the planning, design, construction and operation of a two-year evaluation period, of three full-scale demonstration systems for the treatment of storm generated discharges. As part of the evaluation, the quality of the receiving body was also monitored. Two of the systems, located at two major points of combined sewer overflow to the Root River in Racine, Wisconsin, employed screening/dissolved-air flotation to treat the overflow prior to discharge. The two systems had a combined capacity of 222,000 cu m/dayk (58.5 mgd). The third system utilized screening only for the treatment of urban stormwater, having a capacity of 14,800 cu m/day (3.9 mgd). Results indicated that the 'satellite plant' concept of locating treatment plants at points of combined sewer overflow discharge is a feasible alternative to combined sewer separation. The chlorination system met the fecal coliform standard for the whole body contact specified by the State of Wisconsin for the Root River.