The groundwater layer is generally about 50- 100 meters. The groundwater depth is different in different areas. The geological structure of this area needs to be considered. In areas rich in water resources, the lower the geographical location, the shallower the groundwater depth, which generally appears in10-20m. In the central and western regions of China, it is 500-1000 m.

Excessive fluorine content in water is harmful to the body mainly in teeth and bones, which may cause dental fluorosis and skeletal fluorosis.