P-Dichlorobenzene is a synthetic chemical used in mothballs and air fresheners. It can enter water through industrial waste or improper disposal of consumer products.

P-Dichlorobenzene is a colorless, crystalline solid with a strong odor. It's widely used in industry for producing plastics and as a solvent. In homes, it's found in mothballs and deodorizers. The chemical can leach into groundwater from landfills or industrial sites. Water utilities typically measure it using gas chromatography. While long-term exposure may pose health risks, more research is needed. The EPA has set a maximum contaminant level of 0.075 mg/L in drinking water to protect public health.