Water is one of the essential factors in fulfilling human needs. The existence of water on earth is very abundant, but the quality doesn't meet the standards. The system value of a Drinking Water Treatment Plant (DWTP) can be seen from 3 aspects, quality, quantity, and continuity of water produced. The dry season, increasing population, and the age of DWTP will be faced in maintaining the three aspects of value. Seeing the several conditions experienced by PDAM Tirta Wijaya, it is necessary to evaluate to determine the performance of each unit, the quality of raw and production water, the fulfillment of water needs, the operation during the dry season, and the optimization that needs to be done. Direct observation at DWTP Kesugihan was selected as the method. The water demand in 2029 is 1170.7 l/s, according to the results of the examination of DWTP Kesugihan. The flocculation, sedimentation, and filtration units do not comply with SNI 2774-2008. The results of this study prove that the DWTP unit's performance is quite good. The quality of raw water is still worth considering, the quality of production water has met quality standards, DWTP Kesugihan has not been able to meet water needs as much as 80 percent coverage in 2029, and there is no operational standard during the dry season. Optimization of DWTP Kesugihan by increasing the height of the filtration unit to 6.5 m, the nozzle diameter to 0.05 m, and the number of nozzles to 500 and making SOPs for the dry season.

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