Organic pollutants such as pharmaceuticals, pesticides, and hormones, even at nanoscale concentrations, contaminate drinking water in a way that poses significant risks to humans, animals and the environment. In particular, the steroid hormones estrone, estradiol, progesterone, and testosterone can cause biological damage in humans and wildlife. The European Union has therefore set strict minimum quality standards for safe and clean drinking water, which must also be taken into account in the development of new technologies for water treatment.