Then there was the outbreak of a disease that left people with blackened feet in the coastal area of southern Chiayi which has been proved by experts on contagious diseases to have been related to the protracted use of underground water containing too much arsenic for drinking.
過去嘉南沿海「烏腳病」的發生，也被流行病學者證實與長期飲用含砷量過高的地下水有關。