USGS Water-Quality Data for the Nation - National Water Information System (NWIS)

The USGS compiles online access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, Puerto Rico, the...美国地质调查局（United States Geological Survey, USGS）汇编了全美50个州、哥伦比亚特区、波多黎各及……地区约150万个监测站点所采集的水资源数据，并提供了这些数据的在线访问渠道。