The Kumamoto metropolitan area, along with ten neighboring municipalities, serves as a notable instance of a region that derives its entire municipal water supply from subterranean sources. This system provides essential drinking water to roughly one million inhabitants. The geological composition of the area, shaped by historical volcanic activity from Mount Aso, features porous soil layers. These deposits act as a natural filtration mechanism, allowing rainwater to permeate deep into the earth while simultaneously infusing the water with various minerals. This unique environmental characteristic ensures a consistent and high-quality supply of groundwater for the local population.
Source : The Japan Times
Photo : The Japan Times
