County Geologic Atlas Program

County Geologic Atlas Program


The County Geologic Atlas program exists to develop maps and reports of the geology and hydrogeology of Minnesota. It is a joint program with the Minnesota Geological Survey (MGS).

Mapped Areas

Documents include maps and reports of geology, groundwater, pollution sensitivity, and some special studies (e.g., the distribution of sand and gravel deposits, sinkholes, or other features of interest).

Most projects provide chemistry data and GIS files of the geology and groundwater maps. Documents may be produced by county, region, state, or by special project request. See Maps and Studies for details.

Training on atlas use can be provided upon request. Contact the program supervisor (Contacts).


These documents are used by governments in long-range planning efforts to protect and preserve groundwater, provide information for permitting, for source water protection and well sealing programs, for short-term emergency response to contaminant releases, and by businesses and citizens.


Program funding comes from the DNR Ecological and Water Resources budget as appropriated by the legislature. Projects may also be supplemented by other funding sources that support geologic mapping at the MGS.

New atlas projects have been supported at the MGS since 2007 and the DNR since 2009 by additional funding from the Environment and Natural Resources Trust Fund as recommended by the Legislative-Citizen Commission on Minnesota Resources. Beginning in 2010, county geologic atlases have been supported by additional funding from the Clean Water Fund.

For a county atlas project, the state contributes from 80% to 85% of the project's total cost. The county supplements the state funding by contributing to the MGS an amount based on the individual county's ability to pay. It is also possible for a county to make arrangements to contribute local services in lieu of some, or all, of the cash payment.