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WaterSafety

Ground Water — Water Systems

Water systems sourced from wells and aquifers. Ground water is naturally filtered but can contain minerals and contaminants from underground sources.

32
Systems
6,766,369
People Served
78/100
Avg Score
10
Grade A Systems
Surface WaterGround WaterMixed Sources

Ground Water Systems (32)

Jea Major Grid

Jacksonville, Florida

826,664 people
B

Tucson City Of

Tucson, Arizona

732,906 people
B

Memphis Light, Gas, & Water

Memphis, Tennessee

659,500 people
A

Baton Rouge Water Company

Baton Rouge, Louisiana

596,844 people
A

Lincoln, City Of

Lincoln, Nebraska

296,000 people
A

Glen Burnie-Broadneck

Millersville, Maryland

290,606 people1 violation
D

Madison Water Utility

Madison, Wisconsin

272,000 people1 violation
B

Emerald Coast Utilities Authority (ecua)

Pensacola, Florida

242,172 people
B

Liberty Utilities New York - Lynbrook

Merrick, New York

220,000 people6 violations
F

Wildwood City Water Department

Rio Grande, New Jersey

218,472 people
C

Tallahassee, City Of

Tallahassee, Florida

200,480 people
A

Gru - Murphree Wtp

Gainesville, Florida

195,681 people
C

Kalamazoo

Kalamazoo, Michigan

192,992 people4 violations
F

Lafayette Utilities Water System

Lafayette, Louisiana

169,389 people
A

Lansing Board of Water & Light

Lansing, Michigan

166,000 people
B

Kansas City Board of Public Utilities

Kansas City, Kansas

152,960 people
B

Il American-Champaign

Godfrey, Illinois

150,000 people
A

Cedar Rapids Water Department

Cedar Rapids, Iowa

141,831 people
B

City of Columbia Utilities

Columbia, Missouri

126,254 people
B

Rochester

Rochester, Minnesota

123,624 people
A

South Bend Water Works

South Bend, Indiana

115,000 people
A

Las Cruces Municipal Water System

Las Cruces, New Mexico

98,175 people6 violations
F

Brooklyn Park

Brooklyn Park, Minnesota

89,995 people
B

Sioux City Water Supply

Sioux City, Iowa

85,791 people10 violations
F

City of Gulfport

Gulfport, Mississippi

75,056 people
A

City of Southaven

Southaven, Mississippi

56,000 people
B

City of Olive Branch

Olive Branch, Mississippi

54,025 people
B

Roswell Municipal Water System

Roswell, New Mexico

54,025 people2 violations
F

Grand Island, City Of

Grand Island, Nebraska

51,478 people
A

City of Hattiesburg

Hattiesburg, Mississippi

43,449 people
B

Papillion, City Of

Papillion, Nebraska

35,000 people3 violations
F

Kearney, City Of

Kearney, Nebraska

34,000 people3 violations
F

Frequently Asked Questions

32 tracked water systems use ground water as their primary source, serving a total of 6,766,369 people. The average Water Safety Score for these systems is 78/100.

Ground water from wells is naturally filtered through rock and soil, which removes many contaminants. However, it can contain dissolved minerals, arsenic, and contaminants from underground sources. Proper testing and treatment ensure safety.

Water source type is classified by the EPA in the Safe Drinking Water Information System (SDWIS). Systems report whether they draw primarily from surface water (rivers, lakes, reservoirs), ground water (wells, aquifers), or a mix of both.