人们的饮用水靠自然界的水源供给。我国幅员辽阔,水文地质情况复杂,水源种类很多,但大多数地区所用的水源属于两大类:一类是地面水,一类是地下水。地面水是暴露在地面上的水,如江河、湖泊、水库、坑塘都属于地面水。地下水是埋藏在地下的水,如井水、泉水都是。此外,少数地方,如某些沿海、 People’s drinking water is supplied by natural water. China has a vast territory and complex hydrogeological conditions with a large variety of water sources. However, the water sources used in most areas belong to two major categories: one is surface water and the other is groundwater. Ground water is exposed to the ground water, such as rivers, lakes, reservoirs, ponds belong to the surface water. Groundwater is buried in the water, such as well water, springs are. In addition, a few places, such as some coastal areas,