Hydrogeologic and water-quality characteristics of the St. Peter aquifer, Southeast Minnesota

Water-Resources Investigations Report 83-4200
Prepared in cooperation with the U.S. Environmental Protection Agency
By:  and 



Quality of water in the St. Peter aquifer is generally acceptable for most uses. Sulfate concentrations increase toward the southwestern part of the aquifer because of highly mineralized leakage from overlying Cretaceous deposits. Concentrations of sodium, magnesium, and sulfate generally increase to the west, and those of calcium, bicarbonate, and chloride generally increase toward the margins of the aquifer. Calcium magnesium bicarbonate water is the most common type in the aquifer. The aquifer is well protected from surface sources of Contaminants by the overlying Decorah-Platteville-Glenwood confining bed, which overlies about 80 percent of the St. Peter aquifer. Thin drift, which overlies the east side of the aquifer, provides much less protection than the confining bed. Water in the aquifer generally flows toward the Mississippi River and its tributaries. Some water flows southward into Iowa from a ground-water divide in Dodge and Steele Counties, Well yields from the aquifer, which are generally between 100 and 250 gallons per minute, are generally adequate for most uses.

This report is one of a series on the hydrogeology and water quality of the 14 principal aquifers in Minnesota prepared by the U.S. Geological Survey. The U. S. Environmental Protection Agency requested these studies because of the need for information to develop its Underground Injection Control Program.

Study Area

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Hydrogeologic and water-quality characteristics of the St. Peter aquifer, Southeast Minnesota
Series title Water-Resources Investigations Report
Series number 83-4200
DOI 10.3133/wri834200
Year Published 1983
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Minnesota Water Science Center
Description 2 Plates: 39.91 x 34.63 inches and 39.75 x 34.64 inches
Country United States
State Minnesota
Other Geospatial St. Peter aquifer
Online Only (Y/N) N
Additional Online Files (Y/N) N
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