Pharmaceuticals and personal care products (PPCPs) have attracted considerable attention as emerging environmental contaminants. Within this very diverse group of species with varying physico-and biochemical properties, the chlorinated biphenyl ether triclosan (C12H7Cl3O2, 5-chloro-2-(2,4-dichlorophenoxy)phenol, abbreviated TCS or, less frequently, TCL) is often named as one species of particular concern. Due to its antimicrobial and antifungal properties, TCS is not only used as a disinfectant in health care settings, but also in a large variety of personal care products, such as soaps, deodorants, or toothpastes, and as a preservative in household items. Since potential risks to human health, including reproductive problems and enhanced risk of asthma and allergies, have been identified, the use of TCS in consumer products has been restricted in several countries. Given the persistence of TCS, which is stable to hydrolysis at near-neutral pH values. it comes as no surprise that it is commonly found in wastewaters. Incomplete removal of TCS by wastewater treatment facilities results in a significant discharge into the environment: In a global survey by the German Environment Agency (Umweltbundesamt), triclosan was listed among the 20 PPCP contaminants that were most frequently detected in surface water, groundwater, or drinking water. In the European Union, it has recently been proposed to add triclosan to a list of priority water pollutants requiring more stringent control measures (EU legislative procedure 2022/0344/COD).