New Online USGS Pesticide Mapper

USGS has developed a new interactive mapping tool, referred to as Watershed Regression for Pesticides (WARP), that provides predicted concentrations for 108 pesticides in streams and rivers across the Nation and identifies which streams are most likely to exceed water-quality guidelines for human health or aquatic life.  The model is based on data from USGS monitoring of pesticides in streams across the Nation since 1992 as part of the National Water-Quality Assessment (NAWQA) Program. Water managers and the public can use the tool to create maps showing where pesticides are likely to occur in local streams and rivers and evaluate the likelihood of concentrations exceeding water-quality guidelines.   Visit the USGS web site to check out the new mapping tool and get more information on pesticides.  For questions, please contact Wes Stone of USGS at