Agricultural is recognised as being the leading contributor to groundwater. As a consequence, the consumer have to has bear the high expenses of water supplied to be treated. Importantly, the cost of water supplied is a function of the water quality as well as the scale of drinking water treatments. The relationship between the consumer payment and water quality improvement was affected by the scale of drinking water treatments directly. Hence when we achieve the high quality and low cost in the case of groundwater treatment for drinking, it is needed to consider both water quality and plant scale.