Groundwater maps

Products include maps and interpretive reports of geology, groundwater, pollution sensitivity, and special studies. Many provide separate GIS files and water chemistry information.

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County Atlas (CGA)

County geologic and groundwater information. Recent atlases are split into two parts. 

Part A: Geologic studies include surficial deposits and bedrock.

Part B: Groundwater studies include flow systems, aquifers, groundwater chemistry, and sensitivity to pollution.
 

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Regional Hydrogeologic Assessment (RHA)

Larger areas (typically 4-9 counties) covered in less detail than a county atlas. Includes areas in the Anoka Sand Plain, Southwestern Minnesota, Southern Red River Valley, Upper Minnesota River Basin, Otter Tail, and Traverse-Grant.

These are older assessments that will be replaced by the County Geologic Atlases as they are completed.
 

Minnesota Groundwater Provinces 2021

Minnesota map summarizing the regional differences in aquifers and groundwater resources. The six provinces are based on bedrock and glacial geology and have unique combinations of groundwater sources and availability for drinking water, industry, and agriculture. 


 

Springs, Springsheds, and Karst

Program overviews and online map applications including the Minnesota Spring Inventory and Minnesota Groundwater Tracing Database. Additional information includes dye trace reports from springshed mapping, findings of karst investigations, and access to the Karst Features Database.