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Pesticides are one type of pollutant found in California' s surface waters at levels that may be harmful to the aquatic ecosystem. When toxicity occurs, pesticide loadings and surface water pesticide concentrations must be reduced to levels that are not harmful to aquatic life. Factors affecting the potential for a pesticide to move "offsite" from a treated area include field soil properties, climate, grower management practices, and the physical and chemical properties of the active ingredient. This publication provides information to assist pesticide users in evaluating their choice of pesticide products on the basis of the potential to impact surface water quality.

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