1,1,1-Trichloro-2-Propanone is a chemical byproduct of water chlorination. It forms when chlorine reacts with organic matter in water and is also used as an industrial solvent.

1,1,1-Trichloro-2-Propanone is primarily formed during the water treatment process when chlorine disinfectants react with naturally occurring organic matter in water sources. It belongs to a group of compounds known as disinfection byproducts (DBPs). While it can also be used as an industrial solvent, its presence in drinking water is mainly due to chlorination. Water utilities monitor for this compound using gas chromatography-mass spectrometry (GC-MS) techniques. Reducing organic matter in source water or using alternative disinfection methods can help minimize its formation.