The Streams and Waterbodies of the United States data layer shows the location of water features throughout the United States, Puerto Rico, and U.S. Virgin Islands
Ohio EPA collects and reports information on groundwater quality, and provides data from groundwater monitoring.
The Minnesota Department of Health provides GIS shapefiles on drinking water protection area, as well sampling results of manganese, radionuclides, nitrates.
The Minnesota Source Water Assessment Program allows users to access Source Water Assessment reports for Minnesota communities.
The Indiana Department of Environmental Management's Ground Water Section maintains the Indiana Wellhead Protection Program. Indiana's Wellhead Protection page includes information on project implementation and featured communities.
The New York Rural Water Association provides technical assistance to rural and small communities for developing and implement source water protection plans.
The Wisconsin DNR's Surface Water Data Viewer (SWDV) is an interactive map that displays primarily statewide water-related data.
River segments, lakes, and estuaries designated under Section 303(d) of the Clean Water Act in Lake Michigan Basin (MI and WI).
The PA DEP open data portal provides GIS data for drinking water, water quality, and other resources.