1,2,3-Trichloropropane is a synthetic chemical used in solvents and pesticides. It can contaminate groundwater from industrial sites and agricultural areas. It is a known carcinogen.

1,2,3-Trichloropropane (TCP) is a man-made chlorinated hydrocarbon that has been used as an industrial solvent and pesticide ingredient. It can leach into groundwater from manufacturing facilities, hazardous waste sites, and areas where certain fumigants were applied. TCP is highly persistent in the environment and can travel long distances in groundwater. Detection typically involves gas chromatography. The EPA classifies it as "likely to be carcinogenic to humans" based on animal studies. Some states have set strict limits for TCP in drinking water due to health concerns.