南京是以地表水作为主要水源的城市，地下水只在城市供水中占很小一部分，与自来水相比，地下水含有多种人体必需的微量元素；与纯净水等相比，矿泉水为最好的饮用水。最重要的一点，地下水具有地表水所无法代替的优质、恒温、动态变化稳定和不易污染等特点，合理利用地下水资 Nanjing is a city where surface water is the main source of water. Groundwater accounts for only a small portion of urban water supply. Compared with tap water, groundwater contains trace elements that are essential to the human body; mineral water is the best compared to purified water drinking water. The most important point is that groundwater has the characteristics of high quality, constant temperature, dynamic stability and unpolluted pollution that surface water can not replace. Therefore, the rational use of groundwater