Based on direct experience in the use and treatment of produced waters in the enhanced oil recovery field (steam flooding), a case is made for the judicious use of raw or pretreated oil shale plant wastewaters (mine water, retort water, process condensates) as makeup to steam generator systems. This water reuse option can effectively reduce the requirements for fresh water and, in some cases, provide a means of concentrating wastewater organics and salts in the steam generator blowdown. This lower volume, concentrated waste stream may be more amenable to ultimate treatment or disposal in the overall water management plan. Recommendations on steam generator feedwater quality and treatment are made. Options for blowdown treatment and/or ultimate disposal are also provided. The types of steam generator systems available are described as are data on operating systems in the enhanced oil recovery field. 15 refs.