This paper deals with the adverse effects of domestic wastewater on water utilization occurring as a result of a deteriorating water environment caused by the lack of an adequate domestic wastewater management system in Japan. Available domestic wastewater management systems are summarized from the viewpoints of performance and administration. Further, the factors to be considered in selecting an appropriate domestic wastewater management system for a projected area are discussed, and one typical example of a water environment, conserved well by comprehensive implementation of domestic wastewater management, is given.

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