 Due to naturally-occurring fluoride, both skeletal and dental fluorosis have been endemic in India in at least 20 states, including Uttarakhand, Jharkhand and Chhattisgarh.The maximum permissible limit of fluoride in drinking water in India is 1.2 mg/L, and the government has been obligated to install fluoride removal plants of various technologies to reduce fluoride levels from industrial waste and mineral deposits.Now reverse osmosis plants are widely used.