The safe limit of Fluorine in drinking water is -
Fluorine is the most abundant element in nature. Fluorine is essential for the normal mineralisation of bones and formation of dental enamel. Recommended level of fluoride in drinking water is 0.5 to 0.8 mg per litre. Excessive levels of fluorine results in dental flourosis, skeletal fluorines, genu valgum. Recommended upper limit is 1.5mg/L. Park's Textbook of Preventive and Social Medicine, 25th edition, Page No. 682, 783
0.2-0.5 mg/L
0.5-0.8 mg/L
0.8-1.2 mg/L
1.2-2.0 mg/L
Environment and health