This thesis investigates the retrofitting of existing large lot residential neighborhoods with low-impact development water quality controls as a necessity for the long-term success of a regional stormwater management plan. The research involves looking back at the history of stormwater management, establishing the environmental benefits of stormwater retrofitting for water quality and identifying key legislation, funding and public support issues. Case studies of urban water quality stormwater retrofits are analyzed. A project application is used to determine the possibilities and limitations of a low-impact development water quality retrofit of a suburban residential neighborhood in the Georgia Piedmont region, using bioretention areas as the water quality control. In order to provide a quantifiable value for this project, a cost estimate was generated using extrapolated numbers from an existing retrofit project.