The water quality of rivers currently is seriously polluted in Taiwan for influencing drinking water quality, harming onto plants growth caused soil pollution problems by using river irrigation and harming the human health indirectly by contamination in river sediments. In this work, we will investigate the area of river water quality characteristics and pollution sources to solve effectively for the pollution problems in the river area of A-Gong-Den in Kaohsiung County. The source of the river area of this study is dam of A-Gong-Den. Their water quality is polluted majorly by the domestic and industrial wastewater. The dark red-color of river body was due to the effluent from those industrial factories. Heavy metals such as Zn, total Cr ions and conductivity were all over the water quality standard of irrigation uses. Thus, we will try to improve the color problems in this area of river by diagnostics method in five factories having wastewater treatment plants. The effective solution in management and controlling will be discussed. We investigate the treatment facilities and performance evaluation in five industrial plants. We found the wastewater treatment and operation technology should be done and elevated in some factories. Importantly, the marked signs in pipelines in wastewater treatment were not clear and operated under not normal conditions. The EPA in county should send officers for checking the operations of the wastewater treatment plants in listings with a normal period for once.