Question raised in Lok Sabha on Contaminated Drinking Water, 10/12/2015. The State departments dealing with rural drinking water supply have reported arsenic, fluoride, iron, salinity, nitrate and heavy/toxic elements in some parts of the country with concentrations above prescribed permissible limits in rural drinking water sources. The heavy/toxic elements being reported from the laboratories set up in the country include Manganese, Copper, Aluminum, Mercury, Uranium, Lead, Cadmium, Chromium, Selenium and Zinc.