The need of the day is sustainable supply of portable water for human consumption so that health and wellbeing of the community can be addressed. Furthermore treating of the polluted water and making it safe for drinking and domestic use is the main challenge for the world today. However proper design and commissioning of treatment plants only may not ensure its proper functioning but it requires frequent evaluation of performance of various units of treatment plant. Skilful plant operation and attention to the requirements of the sources of supply and distribution system are equally important to guarantee safe drinking water supply. In this paper an attempt has been made to take stalk of performance evaluation of various water treatment units. The study revealed that treatment units are functioning satisfactorily and treated water is meeting drinking water quality standards prescribed by BIS. The work is an outcome of M.Tech dissertation.