1,2-Dibromo-3-Chloropropane is a banned pesticide that persists in groundwater. This synthetic chemical was used as a soil fumigant and causes reproductive harm.

1,2-Dibromo-3-Chloropropane (DBCP) was widely used as a soil fumigant and nematocide in agriculture from the 1950s to 1970s. Despite being banned in the U.S. in 1979 due to its toxicity, DBCP persists in groundwater due to its slow degradation. It primarily enters drinking water through agricultural runoff and leaching into aquifers. DBCP is measured in parts per billion (ppb) using gas chromatography. Its presence in water sources remains a concern decades after its prohibition, highlighting the long-term environmental impact of certain pesticides.