Geogenous and anthropogenous contaminants in drinking-water.

A review is given on the quality of water samples, regularly sent to the LU FA Oldenburg for analysis. Most of the samples derive from reduced groundwa ter bodies, indicated by a high concentration of iron (Fe, median 3 mg/l) a nd a low concentration of nitrate (NO3-, median 3 mg/l), Samples from peat land regions often show high concentrations of ammonium (NH4-) and a high o xidability. Samples from near the coast or near a salt mine may contain hig h salt concentrations. The deviation of the results is usually very high; i n individual cases any parameter is able to make the water unusable. Each c omponent may spoil the water for animal consumption if its concentration is too high. A scheme of standard values is given with the 4 graduations safe /enhanced/dangerous/unusable. Kind and age of the animals have to be taken into account, when water is assessed for animal consumption. The intake wit h the fodder of some substances such as Fe or NO3- is many times higher tha n the intake with the water.