"... is a resource for environmental system developers and enterprise architects. It also provides environmental program managers and users of environmental information with automated services to enable better understanding of environmental terminology and data used by the Agency."
This site from the United States Geological Survey provides "access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, and Puerto Rico." Data is divided into categories of surface water, ground water, and water quality.
"Recognizing the importance of America’s wetlands, Congress enacted the Emergency Wetlands Resources Act (Public Law 99-645) of 1986. It requires the U.S. Fish and Wildlife Service (Service) to map wetlands in the United States, as well as conduct national status and trends studies and report to Congress every decade. These mandates are carried out by the Service’s National Wetlands Inventory Program (NWI), which provides foundational data for wetland science, management, and policy actions, from the individual wetland to the national scale."
"We are the Nation’s leading authority for environmental data, and manage one of the largest archives of atmospheric, coastal, geophysical, and oceanic research in the world. NCEI contributes to the NESDIS mission by developing new products and services that span the science disciplines and enable better data discovery. "
"NASA promotes the full and open sharing of all its data to research and applications communities, private industry, academia, and the general public. In order to meet the needs of these different communities, NASA’s Earth Observing System Data and Information System (EOSDIS) has provided various ways to discover, access, and use the data. "