The U.S. Geological Survey provides an interactive map that allows users to view changes in groundwater levels and associated land subsidence since 1977 in the Houston-Galveston area.

The map uses annual data from over 800 wells, and shows changes in water levels in three major aquifers in the region: the Chicot, Evangeline, and Jasper aquifers.

The Delaware Geological Survey provides an interactive map with a large amount of information about groundwater in the state, including:

The South Dakota Department of Environment and Natural Resources provides an interactive map of water wells in the state based on water well completion reports. Users can search for wells by place, ownership, well type, driller, and date of completion.

By clicking on an individual well, you can access well data and the completion report. All data and reports can be downloaded for further use. The interactive map also provides a searchable database of drillers and pump installers in the state.

The South Dakota Department of Environment and Natural Resources provides an interactive map of groundwater levels at over 1000 observation wells across the state. Users can click on each well for more detailed information, including:

The Minnesota Department of Natural Resources' Watershed Health Assessment Framework provides a comprehensive look at Minnesota's watershed and environmental information in the form of an interactive map. The map includes information on: