In the United States, only California and Arizona require applicators to report pesticide usage, and the California database is public.
California Pesticide Information Portal – CalPIP contains pesticide-use data back to 1990 and is searchable by county, ZIP code, crop, product, chemical name and whether the pesticide was used in an ag or non-ag setting. California Department of Pesticide Regulation.
California Pesticide Use Reporting – Provides pesticide use annual summaries back to 1989. California Department of Pesticide Regulation.
Pesticide Industry Sales and Usage – U.S. Environmental Protection Agency market estimates for 2008 to 2012.
Agricultural Chemical Use Database – This National Agricultural Statistics Service site contains select pesticide-use data from 1990 to 2008.
Pesticide Use Maps – The U.S. Geological Survey developed this site, which generates maps showing the estimated use of agricultural chemicals by county from 1992 to 2012, and provides preliminary use estimates through 2015.
Pesticide Statistics – A convenient collection of pesticide statistics collected by the National Pesticide Information Center at Oregon State University.