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Water Well Database

The County Well Index (CWI) is a data base that contains information for over 452,000 water-wells drilled in Minnesota. The data are derived from water-well contractors' logs of geologic materials encountered during drilling. Confirmed locations and interpreted geologic well records are available for over 244,500 of the wells. Available data also include casing, screen and pump information.

CWI is now Web accessible at CWI ONLINE. The data base can be searched and files printed. Files cannot be downloaded.

Due to the Homeland Security Act of 2002, wells supplying public water systems will not be displayed in CWI Online. If you need access to this information, contact Brian Johnson at the MN Department of Health 651-201-4688. This restriction also applies to a data CD or downloadable file.

If a CD or downloadable file is required, contact the MGS Map Sales Office. Please print the order form to mail a request.

Frequently asked questions about CWI. This FAQ does not include information about the web based CWI. Please refer to the help files for CWI Online.

Attribute definitions for unit stratigraphy and well use can be found in the linked pdf files.

NOTICE: CWI stratigraphic nomenclature changes coming August1, 2014.