Delaware Geologic Information Resource (DGIR) Map Viewer

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The Delaware Geologic Information Resource (DGIR) is an online data display tool and map viewer for a variety of geologic and hydrologic information released by the Delaware Geological Survey. It was designed to deliver the most commonly available and requested geologic and hydrologic information that is appropriate for use in hydrologic studies, required by regulation and ordinance, and to support state resource management decisions. Such datasets include surficial and bedrock geologic maps, water table and aquifer grids, well locations, hydrographs, geophysical and lithologic logs, and more. The intent of developing a web-technology enabled system is to provide a more powerful, intuitive, and comprehensive toolset for locating, quickly viewing, and downloading the desired information in an efficient, extensible, and familiar manner. DGIR was initially created under a grant from Delaware Department of Natural Resources and Environmental Control (DNREC), Water Supply Section. (Read here for a brief description on the initial project.)

The intended audience for DGIR is the Delaware professional community. This includes not only Piedmont and Coastal Plain geologists and academic researchers, but also hydrologists, engineers, and state and local officials who need raw data and interpretive information on Delaware's water resources for planning or permitting purposes, and many others who have a strong need for geoscience information. Many of the data and nomenclature displayed on DGIR are technical in nature, and require training and experience for interpretation and application. In most cases, it is highly recommended (and possibly necessary) for users of DGIR to reference DGS publications to understand the data collection techniques, processing methods, interpretations, and limitations of the digital data.

Launch "Beta" DGIR!


Data Disclaimer: Most data provided on DGIR has been previously used or referenced in one (or more) DGS publications. Each publication describes the processing steps and the quality control for its associated datasets. (Links to the relevant DGS publications are provided in DGIR where appropriate.) However, a few datasets on DGIR are part of the normal data collection activities at DGS, for example, geophysical logs, lithologic logs, and groundwater levels. These data were collected, stored in a database, and extracted for inclusion in DGIR. Although they represent the best possible information available for that location, they have gone through limited quality control in the development process. Moreover, DGIR is a statewide application, and many of the layers are composites of regional data sets. Thus, digital artifacts or incongruences may exist along boundaries where similar data collected as disparate data sets have been merged or adjoined. We will endeavor to rectify errors as they are identified by continuing review and active use. Metadata can be found in DGIR for each layer by right-clicking the layer name and selecting “More information.” Errors or inconsistencies in the data should be reported to DGS as possible.

Website Disclaimer: The DGIR website is being launched as a “beta” application. This means that we are actively refining the site, associated data sets, as well as addressing technical glitches as they arise. It also means that DGS would like to test the site and collect information from outside users to better understand how people use the site. If you find the website is not behaving as expected or would like to provide feedback on the site, please contact us via our website ( or email ( Note that the DGIR User Guide may provide answers to many of your questions.