It is called drinking water or water for human consumption to water that can be consumed without restrictions for drinking or preparing food. In the European Union regulations, 98/83 / EU establishes maximum and minimum values for the content minerals and various ions as chlorides, nitrates, nitrites, ammonium, calcium, magnesium, phosphate, arsenic, etc., in addition to the pathogens. The drinking water’s pH needs to be between 6.5 and 9.5. Controls on drinking water often more severe that the controls on mineral waters bottled. In areas with intensive agricultural use, it is increasingly difficult to find wells whose water meets the requirements of the standards. Especially the nitrate and nitrite values, in addition to the concentrations of the phytosanitary compounds, often exceed the threshold of what is allowed. The reason is usually the heavy use of mineral fertilizers or the filtration of the slurry. The nitrogen applied in this way, which is not assimilated by plants, is transformed by soil microorganisms into nitrate and then washed away by rainwater to the water table.