Information on legislative and administrative water pollution control systems in ten Asian countries was collected through direct contact or mail correspondence with relevant government officials or engineers. Effluent concentration control is the most common system to control water pollution. Effluent standard values in the countries examined are compiled and the structural differences of the effluent control systems are discussed. Japan has relatively lenient standards, but because of its supporting measures for the implementation of the effluent standard system it has achieved satisfactory water pollution control.