As part of the ongoing rehabilitation efforts of the once highly polluted Kishon River, about 1.1 million cubic meters of water is being pumped annually into the basin to restore its flow. High quality fresh water is being used, which has encouraged native Israeli flora and fauna to return and flourish.

http://www.jpost.com/Business-and-Innovation/Environment/Once-polluted-Kishon-River-undergoing-rehab-with-the-help-of-tap-water-439353