The new interactive national maps and trend graphs (http://water.usgs.gov/nawqa/pnsp/usage/maps) show the distribution of the agricultural use of 459 pesticides for each year during 1992-2009 for the entire conterminous U.S. The maps and supporting national database of county-level use estimates for each pesticide were developed by the U.S. Geological Survey for use in national and regional water-quality assessments.
