A County Geologic Atlas (CGA) provides information about the geology and groundwater resources of a county, including the groundwater quality, quantity, and sensitivity to pollution. Paper copies can be obtained from MGS Map Sales.
Part A - Geologic Atlas
The Minnesota Geological Survey produces the Part A atlas, which includes the geology, geologic layering, sand distribution, bedrock surface, and depth to bedrock for a specific county.
Part B - Groundwater Atlas
The DNR produces the Part B atlas, which includes maps and reports identifying the direction of groundwater flow, aquifer properties, groundwater chemistry, and pollution sensitivity of aquifers.
Part B Status
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| County, Series # | Part A (MGS) Geology | Part B (DNR) Hydrogeology | Other |
| Aitkin | in progress | future start | |
| Anoka, C-27 | 2013 | 2016 | |
| Becker, C-42 | 2017 | in progress | |
| Benton, C-23 | 2010 | 2012 | |
| Blue Earth, C-26 | 2011 | 2016 | |
| Brown, C-37 | 2016 | in progress | |
| Carlton, C-19 | 2009 | 2011 | |
| Carver, C-21 | 2009 | 2014 | |
| Cass, C-43 | 2018 | in progress | |
| Chisago, C-22 | 2010 | 2014 | |
| Clay, C-29 | 2014 | 2018 | |
| Crow Wing, C-16 | 2004 | 2007 | |
| Dodge | in progress | future start | |
| Dakota, C-06 | 1990 | included in Part A | |
| Fillmore, C-08 | 1995 | 1996 | Part C: 1995 |
| Goodhue, C-12 | 1998 | 2003 | |
| Hennepin, C-04 | 1989 | included in Part A | |
| Hennepin, C-45 revision | in progress | future start | |
| Houston, C-33 | 2014 | in progress | |
| Hubbard, C-41 | 2018 | future start | |
| Isanti | 2017 | in progress | |
| Kanabec, C-38 | 2016 | in progress | |
| Kandiyohi | in progress | future start | |
| Lake | in progress, preliminary files available | to be determined | |
| McLeod, C-20 | 2009 | 2013 | |
| Meeker, C-35 | 2015 | in progress | |
| Morrison, C-31 | 2014 | in progress | |
| Mower, C-11 | 1998 | 2002 | RI-50: 2000 |
| Nicollet, C-25 | 2011 | 2016 | |
| Nobles | in progress | future start | |
| Olmsted, C-03 | 1988 | included in Part A | |
| Olmsted Revision | in progress | future start | |
| Pennington | in progress | future start | |
| Pine, C-13 | 2001 | 2004 | RI-60: 2002 |
| Pope, C-15 | 2003 | 2006 | |
| Ramsey, C-07 | 1992 | included in Part A | |
| Redwood, C-36 | 2016 | in progress | |
| Renville, C-28 | 2013 | 2017 | |
| Rice, C-09 | 1995 | 1997 | |
| Rock | in progress | future start | |
| St. Louis | in progress, preliminary files available | to be determined | |
| Scott, C-17 | 2006 | included in Part A | C-01: 1982 OFR 08-02: 2008 |
| Sherburne, C-32 | 2013 | 2017 | |
| Sibley, C-24 | 2011 | 2017 | |
| Stearns, C-10 | 1995 | 1998 | Part C: 1996 included in Part A link |
| Todd, C-18 | 2007 | 2010 | |
| Wabasha, C-14 | 2001 | 2005 | RI-59: 2002 |
| Wadena, C-40 | 2016 | in progress | |
| Washington, C-05 | 1990 | included in Part A | |
| Washington revision, C-39 | 2016 | in progress | |
| Winona, C-02 | 1984 | included in Part A | |
| Winona revision, C-34 | 2014 | in progress | |
| Wright, C-30 | 2013 | 2018 |