关键词：农药；地质调查；水文数据
摘 要：What follows is a summary of publicly available USGS data for pesticide concentrations in surface water and sediments within the Sacramento-San Joaquin Delta region from the years 1990 through 2010. Data were retrieved though the USGS National Water Information System (NWIS) database, a publicly available online-data repository (U.S. Geological Survey, 1998), and from published USGS reports.