Alpha-Hexachlorocyclohexane is a banned pesticide that can contaminate water through agricultural runoff. It's toxic and potentially carcinogenic to humans.

Alpha-Hexachlorocyclohexane (α-HCH) is a persistent organic pollutant formerly used as an agricultural pesticide. Though banned, it still contaminates water sources through soil runoff and atmospheric deposition due to its long-lasting nature. α-HCH is typically measured in micrograms per liter (µg/L) in water samples. It can bioaccumulate in the food chain, potentially increasing exposure risks for humans and wildlife. Proper water treatment and continued monitoring are essential to minimize its presence in drinking water.