Regarding drinking water as an important component of diet the aim of this project is to measure the content of minerals and trace elements in drinking water in Denmark. 150 samples of tap water from 50 different places, representative for the geographically different areas of Denmark were collected 2 times within one year. The samples were stored at -18°C and analysed for sodium, potassium, magnesium, calcium, chromium, iron, copper, zinc, cadmium, lead, mercury and iodine.