1,2,4-Trimethylbenzene is an organic compound in gasoline and industrial solvents. It can contaminate water from fuel spills or industrial discharge, affecting the nervous system.

1,2,4-Trimethylbenzene is a colorless liquid with a strong odor, commonly found in petroleum products. It enters water sources primarily through industrial discharges, fuel spills, and leaking underground storage tanks. Environmental agencies measure its presence in parts per billion (ppb) using gas chromatography. While not regulated as a primary drinking water contaminant, its presence can indicate broader petroleum contamination. Proper handling and storage of fuels and industrial solvents are key to preventing water contamination by this compound.