The Illinois Effluent Standards Advisory Group has recommended elimination of the present total dissolved solids (TDS) effluent standard in Illinois. Presently the effluent standard prohibits an increase of more than 750 mg/l above the background concentration, except where resulting from waste treatment or recycle. In these two instances, a maximum of 3500 mg/l TDS would be permitted. The elimination of this standard would benefit potable water treatment plants, electric generating stations, and industrial discharger. Reduction of analytical costs and elimination of potential treatment expenses are regarded as benefits of the proposed change. Environmental impacts are considered the costs incurred. Water users continue to pay additional expenses for operation because of the total dissolved solids concentration in streams. The effects upon each group of adopting the proposed change is summarized herein.