The purpose of this study is to investigate the ability of electrodeionization to remove copper ions from dilute solutions without chemical regenerations. Experiments were carried out in a bench-scale stack using a feed solution containing about 50 mg/L of copper. It was demonstrated that electrodeionization operated in either the "enhanced transfer" or the "electroregeneration" regime. In the "electroregeneration" regime, the process was able to produce a pure water product containing non-detectable concentrations of copper, while CuO scale was found on the surface of anion exchange membranes. With optimal conditions, a steady and continuous process can be achieved.