Percent crop area (PCA) adjustment factors reflect the percentage of a watershed that is covered by a particular land cover type and/or crop to which a pesticide may be applied. PCA adjustment factors, based on delineated watersheds for community drinking water intakes across the United States, are used in the process of estimating drinking water concentrations to account for variability in land cover. To date, the Office of Pesticide Programs uses PCA adjustment factors based on Hydrologic Unit Code 02 (HUC-02) regions, which limits the spatial resolution of potential exposure refinements and mitigation when potential drinking water risks are identified. Additional characterization of community water systems identified with high PCAs including spatial distribution, population served, crop footprint, and status of the intake, including treatment processes, are described.

Characterization of drinking water intake watersheds and associated community water systems vulnerable to pesticide contamination

254th National Meeting (2017)

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