Envirofacts: an EPA that allows a user to search for data across a number of different EPA databases. Possible topic searches include air, waste, toxics and facilities.
Toxic Release Inventory: an EPA program that collects data on toxic chemical releases and waste management activities by certain industries. Data exists from 1987 to 2017.
EPA Air: another EPA site that allows users to search for data on air pollution.
AirExplorer: a collection of EPA tools for air quality analysts. Users can generate maps showing air pollution over time, graphs and download data for a specific time period.
National Geophysical Data Center: a part of NOAA (National Oceanic and Atmostpheric Administration), the Center's mission is to be a repository for geophysical and environmental data. Data is available on topics such as coastlines, snow and ice, cosmic rays and ocean drilling.
Mineral Resource Data System: part of the USGS (United States Geological Survey) this system contains data on metallic and non-metallic mineral resources through the world. Information includes deposit name, location, commodity, production and reserves.
State Minerals and Statistics Information: links to an electronic version of the USGS Minerals Yearbook (Volume II - Domestic). Users can find statistics by state on mineral commodities.
Water Science Directors: this USGS webpage lists the directors of various state water science centers. Most interesting is that when you click on the state name, you are taken to a USGS page on water data for that particular state.
Water Resources of New York: website of the USGS which has data on New York's rivers, lakes and groundwater. Realtime as well as historical data are available.
Environmental Statistics Section of the United Nations: has data on certain environmental indicators such as air and climate, biodiversity, land and agriculture and natural disasters. There are been 5 data gatherings since 1999. Country snapshots are included.
OECD.StatExtract: OECD portal to a selection of OECD databases that can be accessed without subscription. Includes some data on water issues.
FAO Statistics Portal: statistics portal of the Food and Agriculture Organization of the United Nations. Databases exist on topics such as agriculture, water, fisheries and forestry.
EuroStat: the data center of the European Union. It includes datasets on environmental indicators, as well as publications.