High levels of pollutants have been discovered in laboratory samples taken from northern rivers. The source of this pollution has not yet been found and the public meanwhile is warned not to enter these rivers.
The polluted rivers include Chatzbani, Yarden Gesher (Jordan Bridge) Ha'chamisha, Yarden Gesher Chori, Yarden Meitzad Ateret, Gilbon Mapal (Waterfall) Devorah, Mejersa, Yehudiah, Mashoshim, Tzalmon Bereichat Haruv, and Tachant Hakemach (Windmill).