The Pesticide Root Zone Model Groundwater (PRZM-GW) was developed as a regulatory model to estimate pesticide concentrations in vulnerable groundwater supplies. Several types of monitoring data sets (including chemical-specific surveys in use areas and intensive site-specific monitoring studies) were compared to PRZM-GW standard tiered assessment approach and refined outputs. The analysis shows the impact of various standard chemical specific and scenario/site specific input assumptions on initial regulatory screening estimates including pesticide use over the simulation period, the location and type of aquifer relative to treated fields, and pesticide property changes with depth. When these data are available to make refinements PRZM-GW provides reasonable estimations of pesticide concentrations in groundwater and should provide an effective tool for more detailed site-specific predictions of pesticide concentrations in groundwater.

Case study comparisons of monitoring data with PRZM-GW predictions

248th National Meeting (2014)

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