Exhibit 21





AMERICAN
WATER WORKS COMPANY, INC. AND SUBSIDIARY COMPANIES





Subsidiaries of the Registrant





The following list includes the Registrant and all of its subsidiaries as of December 31, 2001. The voting interest of each company shown indented is
owned, to the extent indicated by the percentage, by the company immediately above which is not indented to the same degree.





Name of Company

State of Incorporation

Percentage Voting Interest OwnedAmerican Water Works Company, Inc.American Water Capital Corp.

Delaware

100American Water Resources, Inc.

Virginia

100American Lake Water Company

Illinois

100AmericanAnglian Canada Company

Canada

100American Water Services, Inc.

Delaware

100AAET, Inc.

Delaware

100AAET, L.P.

Delaware

100EA2 Systems, L.C.

Missouri

100Azurix Industrials Corp.

Delaware

100Azurix Industrial Operations Corp.

Texas

100Azurix North America Corp.

Delaware

100American Water Services Canada Corp.

Ontario

100Azurix North America Underground Infrastructure Corp.

Ontario

100Uniflo Sewer Services Inc.

Ontario

100Construction et Pavage Nord Americain Ltee

Quebec

100Canarehab Inc.

Canada

100Azurix North America Engineering Corp.

Ontario

100Terratec Environmental Ltd.

Ontario

100Azurix North America Industrial Residuals Corp.

Ontario

100Prism-Berlie (Windsor) Limited

Ontario

100Uniflo Limited

Ontario

100Braemar Acres Limited

Ontario

100Trimax Residuals Management Inc.

Ontario

100Azurix North America Carbon Services Corp.

Ontario

100Horseshoe Carbons Incorporated

Ontario

80Rockcliffe Research Management Inc.

Canada

100Azurix North America (USA), Inc.

Delaware

100Philip Automated Management Controls, Inc.

Georgia

100Azurix North America Residuals Management, Inc.

Texas

100Trimax Residuals Management (USA), Inc.

Delaware

100Azurix North America Operations and Maintenance, Inc.

Texas

100Azurix-JJG, Inc.

Georgia

51Dittman-Merka Enterprises, Inc.

Texas

90Walker Water Works, Inc.

Texas

100Southeast Utilities, Inc.

Texas

100Azurix CDM, Inc.

Washington

80Azurix North America Underground Infrastructure, Inc.

Delaware

100Magnolia Construction Company, Inc.

Louisiana

100National EnviroTech Group, LLC

Louisiana

16
.66Azurix North America Engineering, Inc.

New Jersey

100Utility Management and Engineering, Inc.

New Jersey

100






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Exhibit 21





Continued





Subsidiaries of the Registrant





Name of Company

State of Incorporation

Percentage Voting Stock OwnedAmerican Water Works Company, Inc.American Water Works Service Company, Inc.

Delaware

100Arizona-American Water Company

Arizona

100California-American Water Company

California

100Connecticut-American Water Company

Connecticut

100Hampton Water Works Company

New Hampshire

100Massachusetts-American Water Company

Massachusetts

100New York-American Water Company, Inc.

New York

100The Salisbury Water Supply Company

Massachusetts

100Hawaii-American Water Company

Nevada

100Illinois-American Water Company

Illinois

99.9Indiana-American Water Company, Inc.

Indiana

100Iowa-American Water Company

Delaware

96.40Kentucky-American Water Company

Kentucky

100Long Island Water Corporation

New York

100Maryland-American Water Company

Maryland

100Massachusetts Capital Resources Company

Delaware

100Michigan-American Water Company

Michigan

100Missouri-American Water Company

Missouri

100New Jersey-American Resources Company

New Jersey

100New Jersey-American Water Company, Inc.

New Jersey

100New Mexico-American Water Company, Inc.

New Mexico

99.99Ohio-American Water Company

Ohio

100Pennsylvania-American Water Company

Pennsylvania

96.26Tennessee-American Water Company

Tennessee

99.98Virginia-American Water Company

Virginia

100United Water Virginia, Inc.

Virginia

100West Virginia-American Water Company

West Virginia

99.97Bluefield Valley Water Works Company

Virginia

100