Survey of pesticide distribution in upper Jordan basin

A survey was conducted of pesticide distribution in the water of the upper Jordan basin, due to the importance of its quality as the main source of dr inking water in Israel. A preliminary survey of pesticide distributers and farmers revealed intensive use of many pesticides in agriculture. Four of t hese were selected as targets for monitoring in the surface water of the re gion, at seven sampling stations. The highest residue found was of aldicarb and its metabolites, with lower content of organophosphate and organochlor ine insecticides. No concentrations reached the maximum levels permitted by the EPA for drinking water, but recommendations were made, nonetheless, fo r continuous monitoring of pesticides in the region. Subsequent monitoring (1993-1997) showed a steady decrease in aldicarb residues.