A simple method was used to evaluate pesticide wash-off potential from concrete surfaces, to determine the contribution of herbicide application on impervious surfaces to pollution in urban run-off. Commercially available pavers were treated with an off-the-shelf product containing simazine as the active ingredient. Treatment was conducted according to label directions. The dependence of washable simazine residues in run-off was evaluated on time exposed to outdoor conditions prior to a wash event and repeated washing events. Wash-off potential was greatest 1hr after pesticide application, with simazine concentrations in run-off reduced by � that of 1hr concentrations after 2d. These concentrations remained stable for repeated washings up to 320d and for exposure to outdoor conditions of 14d prior to a wash event. The use of herbicides on impervious surfaces could have major implications for the re-use of stormwater on parks and gardens.

Impervious surfaces as a source of urban pesticide contamination

248th National Meeting (2014)

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