Cis-1,2-Dichloroethylene is a synthetic chemical used as an industrial solvent. It enters water from factory discharges and can damage the liver and kidneys if ingested.

Cis-1,2-Dichloroethylene is primarily produced as a byproduct of other chlorinated solvent manufacturing processes. It can enter drinking water through industrial discharges or leaching from contaminated soil at waste sites. This volatile organic compound (VOC) is typically measured in water using gas chromatography. While exposure to high levels may affect liver and kidney function, the health effects of long-term, low-level exposure are not well established. Environmental agencies monitor and regulate its presence in drinking water to protect public health.