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 drinking water in Israel. A preliminary survey of pesticide distributers and farmers revealed intensive use of many pesticides in agriculture. Four of these were selected as targets for monitoring in the surface water of the region, at seven sampling stations. The highest residue found was of aldicarb and its metabolites, with lower content of organophosphate and organochlorine insecticides. No concentrations reached the maximum levels permitted by the EPA for drinking water, but recommendations were made, nonetheless, for continuous monitoring of pesticides in the region. Subsequent monitoring (1993-1997) showed a steady decrease in aldicarb residues.