Waters produced during the steamflood extraction of bitumen from tar sand require treatment before they can be recycled as feedwater for steam generation. The characterization of two waters from commercial-scale tar sand operations indicates that the levels of hardness, oil and grease, silica, suspended solids, and iron must be reduced before these waters can be reused in the bitumen extraction process. The Western Research Institute proposes two treatment methods (electrocoagulation and ultrafiltration) that may, when used in conjunction with standard practices, improve the efficiency of the overall treatment process. 21 refs., 3 tabs.