It is hardly possible to list all the professions that deal with water. Water experts work, for example, at universities and research centers, at state and municipal institutes and offices, at water-related associations and water supply companies or the innovative companies that manufacture and sell water technologies. 

Water experts are sought after in energy supply companies, water and soil associations, state or private research institutes and last but not least in industrial companies or engineering offices. An important field of activity is drinking water treatment. Iron(II), manganese(II) and ammonium usually have to be eliminated from groundwater, algae and other suspended matter have to be removed from lake and dam water and ultimately the water must not be "aggressive" towards materials. Disinfection processes for hygienic safety are also part of the research areas. Drinking water quickly becomes waste water. Water chemists deal with many substances from household, industrial and agricultural uses such as sweeteners, pharmaceuticals and pesticides. Of course, the chemists are not satisfied with the analysis, but try to show ways of reducing the pollution of our waters. The meanwhile established nutrient elimination in sewage treatment plants would not have been possible without the cooperation of water chemists. The introduction of more extensive wastewater treatment using activated carbon sorption or ozonation is currently an important topic in water chemistry. After all, modern industrial production and energy supply are also inconceivable without water. After fuel, water is the second most important resource for operating the water-steam cycle in large-scale power plants. And the quality requirements there far exceed those of drinking water, as in modern chip production. Ensuring and checking this requires knowledge of water chemistry. In industry in particular, the need for appropriate specialists is growing, as people are increasingly looking for solutions that make production processes more efficient and protect the environment, for example through increased recycling and reuse of water.