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WaterSafety
A

Grade A — Excellent Water Systems

Score range: 80-100/100

Water systems with excellent safety records, minimal violations, and no contaminant exceedances.

78
Systems
29,996,909
People Served
98
Avg Score
0
Health Violations
Grade AGrade BGrade CGrade DGrade F

Grade A Water Systems (78)

Washington Suburban Sanitary Commission

Laurel, Maryland

1,900,000 people
A

East Bay MUD

Oakland, California

1,442,800 people
A

Dallas Water Utility

Dallas, Texas

1,356,479 people
A

Charlotte Water

Charlotte, North Carolina

1,163,701 people
A

Fairfax County Water Authority

Herndon, Virginia

1,121,613 people
A

Mo American St Louis St Charles Counties

Chesterfield, Missouri

1,111,000 people
A

Gwinnett Co. Dept. of Water Resources

Lawrenceville, Georgia

975,000 people
A

Louisville Water Company

Louisville, Kentucky

764,769 people
A

Cincinnati Public Water System

Cincinnati, Ohio

750,200 people
A

Dekalb County

Decatur, Georgia

743,000 people
A

Cobb County

Marietta, Georgia

695,000 people
A

Memphis Light, Gas, & Water

Memphis, Tennessee

659,500 people
A

Oklahoma City

Oklahoma City, Oklahoma

644,000 people
A

Detroit City Of

Detroit, Michigan

633,218 people
A

Milwaukee Waterworks

Milwaukee, Wisconsin

626,000 people
A

Baton Rouge Water Company

Baton Rouge, Louisiana

596,844 people
A

Albuquerque Water System

Albuquerque, New Mexico

560,326 people
A

City of Fresno

Fresno, California

545,716 people
A

Water District 1 of Johnson Co

Kansas City, Kansas

482,000 people
A

Truckee Meadows Water Authority

Reno, Nevada

442,000 people
A

Virginia Beach, City Of

Virginia Beach, Virginia

437,994 people
A

Minneapolis

Minneapolis, Minnesota

425,300 people
A

Newport News, City Of

Newport News, Virginia

407,300 people
A

Greenville Water (2310001)

Greenville, South Carolina

396,265 people
A

Wichita, City Of

Wichita, Kansas

395,699 people
A

Metropolitan District Commission

Hartford, Connecticut

390,887 people
A

Chesterfield Co Central Water System

Chesterfield, Virginia

389,897 people
A

North Las Vegas Utilities

North Las Vegas, Nevada

376,515 people
A

Central Arkansas Water

Little Rock, Arkansas

368,455 people
A

Alameda County Water District

Fremont, California

344,000 people
A

Henderson City Of

Henderson, Nevada

336,534 people
A

Ecwa Direct

Buffalo, New York

335,000 people
A

Charleston Water System (sc1010001)

Charleston, South Carolina

327,422 people
A

Bellevue City Of

Bellevue, Washington

317,330 people
A

Kentucky-American Water Co

Lexington, Kentucky

299,501 people
A

Lincoln, City Of

Lincoln, Nebraska

296,000 people
A

City of Plano

Plano, Texas

292,059 people
A

Montgomery (ww&ssb of the City Of)

Montgomery, Alabama

276,000 people
A

E Jefferson Ww District 1

Jefferson, Louisiana

275,163 people
A

Grand Rapids

Grand Rapids, Michigan

273,005 people
A

CWS - Bakersfield

San Jose, California

267,881 people
A

Huntsville Utilities

Huntsville, Alabama

262,158 people
A

Clarksville Water Department

Clarksville, Tennessee

251,864 people
A

Gsw&sa (sc2620004)

Conway, South Carolina

247,550 people
A

City of Frisco

Frisco, Texas

231,910 people
A

Everett Public Works Dept. City Of

Everett, Washington

215,774 people
A

Tennessee American Water

Chattanooga, Tennessee

211,499 people
A

Indiana American Water - Northwest

Greenwood, Indiana

210,510 people
A

Worcester Dpwp, Water Supply Division

Worcester, Massachusetts

206,518 people
A

Tallahassee, City Of

Tallahassee, Florida

200,480 people
A

Alderwood Water District

Lynnwood, Washington

200,000 people
A

Contra Costa Water District

Concord, California

198,000 people
A

Aurora

Aurora, Illinois

183,000 people
A

Evansville Water Utility

Evansville, Indiana

182,444 people
A

Eugene Water & Electric Board

Eugene, Oregon

176,000 people
A

Lafayette Utilities Water System

Lafayette, Louisiana

169,389 people
A

Kent Water Department

Kent, Washington

166,421 people
A

Redmond Water System City Of

Redmond, Washington

163,335 people
A

Del-Co Water Company, INC.

Delaware, Ohio

150,000 people
A

Il American-Champaign

Godfrey, Illinois

150,000 people
A

Iowa-American Wtr Co-Davenport

Davenport, Iowa

147,720 people
A

Chester Water Authority

Chester, Pennsylvania

140,437 people
A

Pa Amer Water Co Lake Scranton

Wilkes Barre, Pennsylvania

134,570 people
A

Rochester

Rochester, Minnesota

123,624 people
A

Cambridge Water Department

Cambridge, Massachusetts

118,214 people
A

Fayetteville Waterworks

Fayetteville, Arkansas

116,398 people
A

South Bend Water Works

South Bend, Indiana

115,000 people
A

Racine Waterworks

Racine, Wisconsin

105,100 people
A

Kenosha Water Utility

Kenosha, Wisconsin

99,218 people
A

Springdale Water Utilities

Springdale, Arkansas

98,948 people
A

North Penn Water Authority

Lansdale, Pennsylvania

91,941 people
A

Bloomington

Bloomington, Minnesota

91,300 people
A

Rogers Water Utilities

Rogers, Arkansas

81,443 people
A

Ankeny, City Of

Ankeny, Iowa

76,207 people
A

City of Gulfport

Gulfport, Mississippi

75,056 people
A

Morgantown Utility Board

Morgantown, West Virginia

64,644 people
A

Grand Island, City Of

Grand Island, Nebraska

51,478 people
A

Beckley Water Company

Beckley, West Virginia

47,386 people
A

Frequently Asked Questions

A Grade A rating means the water system scored between 80-100 out of 100 on our Water Safety Score. Water systems with excellent safety records, minimal violations, and no contaminant exceedances. The score factors in health-based violations (40%), contaminant exceedances (30%), enforcement history (20%), and monitoring compliance (10%).

78 water systems are currently rated Grade A, serving a combined population of 29,996,909 people. 0 of these systems have at least one health-based violation on record.

Use the search tool on our homepage to look up your water system by zip code. Every system in the US is graded A through F based on EPA violation data from the Safe Drinking Water Information System (SDWIS).