This study assessed industrial wastewater quality of Da River Left-bank Industrial Zone - Hoa Binh City in the 2014-2015 periods and then proposed solutions for decreasing the water pollution. Regarding to the state of wastewater treatment, Da River Left-bank Industrial Zone is a place that has largest amount of wastewater discharge in Hoa Binh City. In the Industrial Zone, a number of companies discharged wastewater directly into Dung stream (flowing to Da River) an extremely large amount of industrial wastewater with concentration of BOD5, COD, total Coliform, AOX, TSS, etc seriously exceed the permissible standards, cause serious pollution in the 2014-2015 periods and effect the environment and local people. After assessing the situation in the Industrial Zone, the essential solutions were proposed. In term of management, local authorities need to take coercive measures against companies which discharged the untreated or unsatisfactory treated wastewater directly into environment. With technological solution, the Industrial Zone has to select appropriate production technologies and innovative technology. Overall, the options considered and evaluated in the thesis indicated that Da River Left-bank Industrial Zone can implement those options to prevent and manage the quality of wastewater in order to protect environment in a legal, logical and financially practical way.