The Kishon River (Hebrew: נחל הקישון) is a river in Israel that flows into the Mediterranean Sea at the city of Haifa. Considered the most polluted river in Israel, it has been the subject of controversy regarding the struggle to improve the water quality. The pollution stems in part from daily contamination for over 40 years with mercury, other heavy metals, and organic chemicals by nearby chemical plants. A 2000 analysis of the river water revealed