The city of Kumamoto and their surrounding area, where have the population over 0.7 million, are one of the unique prefecture capital because of its 100% groundwater supported city water. Recent expansion of the urban land-use area induces the decrease of groundwater resources in spite of economical water-use efforts, and the local government takes measures to maintain stable groundwater recharge rate. Also the groundwater contamination caused by the agricultural origin N-NO3 has been clearly rising recently. To maintain environmentally stable regional groundwater resources from both quantity and quality aspects, it is necessary to enlighten the people′s concern about the sustainable use of the regional groundwater resources. The report introduces the ongoing efforts conducted in the city of Kumamoto area for this purpose.
