Lake in a valley in the eifel with the sun rising in the background.

How is Gerolsteiner mineral water made?

The origin of all types of water

Illustrated explanation of different water origins. © Gerolsteiner

What are the differences between mineral water and other types of water? The diagram on the right-hand side illustrates the origin of different kinds of water.

Mineral water and spring water derive from deep water. In contrast, tap water (also known as municipal water), is often a mixture of surface and ground water.

The Origin of Natural Mineral Water

Gerolsteiner bottle surrounded by green plants outdoors. © Maximilian Lehrke Photography

Natural mineral water must be in the same original and pure condition when it is filled into the bottle as when it came from the ground. It may not contain any chemical substances, additional minerals or other types of water. Only the removal of iron (deferrisation), manganese and sulphur is permitted by law. Iron can precipitate in the bottom of the bottle in the form of unsightly brown flakes. Too much sulphur would affect the smell and taste. Regulating the carbonic acid content is also permitted.

The purity and originality of every mineral water is controlled by regular inspections. Once any contamination is detected, the water loses its “natural mineral water” designation and may no longer be sold as mineral water.

You have to go very deep into the earth’s crust to locate natural mineral water. There are a limited number of sources worldwide. Gerolsteiner mineral water comes from sources of up to 250 meters deep.

water knowledge

Minerals in mineral water 

Find out what makes natural mineral water so special and where it comes from.  

find out more about minerals