In my opinion it is difficult to limit the boundaries of source water protection because along this river are surrounded by factories, croplands, and municipal landfill which can discharge wastewater illegally to the river and made the river contaminated. If river has to be protected the possibly way is to protect and strictly monitor the intake water before come into PWS and establish the water quality monitoring stations at the risky points where has discharge such as river nearby cattle farm, plastics manufacturing, and food processing plant. Upstream monitoring is required to be a reference point and compare which this river is contaminated or not.