In previous work, the effects of water quality have been shown to influence theformation of scale from copper corrosion. A general understanding of the effects of water quality on copper corrosion has been difficult to obtain because of complex interactions of water quality variables on copper corrosion in different water supply systems. The objective of this study was to examine the effects of temperature and water hardness on copper corrosion occurring in a household water supply system. The effects of recirculation were also studied in concurrence with the above water quality parameters. Electrochemical corrosion testing and corrosion byproduct release testing were used to determine the effects of temperature, water hardness, and recirculation on corrosion rates and copper corrosion byproduct release. Includes 11 references, tables, figures.