We thought we had problems.

Take this: Every third person deprived of clean water in the world is an Indian. About 86 per cent of total diseases in the country are directly or indirectly related to poor quality of drinking water. Figures revealed by Consumer Unity and Trust Society (CUTS) state that a shocking 70 per cent of India's water is polluted. Lakhs of people in West Bengal are suffering from arsenic contamination in ground water. As many as 13 states are identified as endemic to fluorosis due to abundance of fluoride bearing minerals in water. Dangerously high levels of mercury have been found at certain places in Haryana, Gujarat and Andhra Pradesh. Not only this, excessive iron elements have been found in a river in Madhya Pradesh. Owing to its red colour it is known as ‘khooni nadi’. Naturally occurring contaminants are also found in drinking water. The radioactive gas Radon-222 occurs in certain types of rocks and can get into ground water. Toxic effluents from industries are also causing a hike in cardio vascular diseases, hypertension and cancer.

Still you can't have too much fluoride.