Steam is one of important energy form highly required in textile industry for several textile processing. In Ethiopia there are several vertically arranged complex textile mills. Bahir Dar Textile Share Company (BDTSC) which is situated in Bahir Dar City, Capital of Amhara National Regional State is one of them. BDTSC uses electrical boiler for its steam generation. The steam produced by boiler has been used for sizing, pretreatment (desizing, scouring and bleaching), dyeing and finishing process operations. For efficient steam production electrical boiler has been fed with fine and soft water. The BDTSC water softening treatment line effectiveness was analyzed from the source (River Abay) to final line (zeolite) treatment unit as per water quality required for steam generation by boiler. Each water treatment arrangement, progressively gives improved water quality. However, overall treated water quality is not to level of required standard quality for steam generation in boiler, and in particular it contains large amount of hardness and total suspended solids which are beyond the acceptable limit for boiler water quality. As a result scale and sludge were formed in interior parts of the boiler and the boiler efficiency was decreased to 35%.Therefore, the water treatment line of BDTSC was optimized for achieving; water quality required for boiler use. Optimization activities were performed for each treatment unit arrangement considering specific optimization parameters for each treatment unit arrangement. With optimized treatment unit’s arrangement, the water quality required for boiler was significantly improved and as a consequence the calculated boiler efficiency increased from 35% to 66.3%. As per the record obtained from BDTSC, with previous water treatment arrangement, 8 mm thick scale is formed within three months interval, while with optimized water treatment units arrangement it is expected only 3mm thick scale will be formed within similar period of time interval.