A new urban pesticide exposure model scenario was parameterized to represent seven different US geographic regions (California, the Northwest, North Central, Northeast, Mid-Atlantic, Southeast, and South Central) as part of a national aquatic ecological risk assessment.  The scenario for the coupled SWMM/AGRO-2014 model, based on a high vulnerability urban residential watershed in Orange County California, was used to estimate potential pyrethroid exposure in aquatic ecosystems. For each region, 30-year hourly precipitation time series and local irrigation schedules were compiled. Detailed pyrethroid use survey data were used to define the conservative estimates of pyrethroid use extent, frequency, and seasonality for each regional parameterization. The regionally parameterized SWMM/AGRO-2014 model was applied to simulate expected environmental concentration (EEC) distributions for multiple pyrethroids across all seven regions. The region with the highest urban EECs was California, followed by the Southeast and South Central US. The risk of ecological effects resulting from these simulated pyrethroid EECs was found to be low.

New approach to modeling pesticide potential aquatic exposure in urban residential environments: Application in a national ecological risk assessment

248th National Meeting (2014)

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