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| Entity Name | | Entity Type | | Jurisdiction of Organization |
| American Industrial Water LLC | | Limited Liability Company | | Ohio |
| American Lake Water Company | | Corporation | | Illinois |
| American Water (USA), LLC | | Limited Liability Company | | Delaware |
| American Water Canada Corp. | | Corporation | | Ontario |
| American Water Capital Corp. | | Corporation | | Delaware |
| American Water Enterprises Holding, LLC | | Limited Liability Company | | Delaware |
| American Water Enterprises, LLC | | Limited Liability Company | | Delaware |
| American Water Defense Services, LLC | | Limited Liability Company | | Delaware |
| American Water Federal Services, LLC | | Limited Liability Company | | Delaware |
| American Water Military Services, LLC | | Limited Liability Company | | Delaware |
| American Water Operations and Maintenance, LLC | | Limited Liability Company | | Texas |
| American Water Real Property Holdings LLC | | Limited Liability Company | | Delaware |
| American Water Services CDM, Inc. | | Corporation | | Washington |
| American Water Works Service Company, Inc. | | Corporation | | Delaware |
| AUI Acquisition Company, LLC | | Limited Liability Company | | Pennsylvania |
| AWC Acquisition Company, LLC | | Limited Liability Company | | Pennsylvania |
| AW Insurance LLC | | Series Limited Liability Company | | Delaware |
| AWIP Holdings LLC | | Limited Liability Company | | Delaware |
| AW Technologies, LLC | | Limited Liability Company | | Delaware |
| Bluefield Valley Water Works Company | | Corporation | | Virginia |
| California-American Water Company | | Corporation | | California |
| Edison Water Company | | Corporation | | New Jersey |
| Environmental Management, LLC | | Limited Liability Company | | Missouri |
| E’town Properties, Inc. | | Corporation | | Delaware |
| E’town Services L.L.C. | | Limited Liability Company | | New Jersey |
| Georgia-American Water Company LLC | | Limited Liability Company | | Delaware |
| Hawaii-American Water Company | | Corporation | | Nevada |
| Illinois-American Water Company | | Corporation | | Illinois |
| Indiana-American Water Company, Inc. | | Corporation | | Indiana |
| Iowa-American Water Company | | Corporation | | Delaware |
| Kentucky-American Water Company | | Corporation | | Kentucky |
| Laurel Oak Properties Corporation | | Corporation | | Delaware |
| Liberty Water Company | | Corporation | | New Jersey |
| Maryland-American Water Company | | Corporation | | Maryland |
| Missouri-American Water Company | | Corporation | | Missouri |
| New Jersey-American Water Company, Inc. | | Corporation | | New Jersey |
| One Water Street LLC | | Limited Liability Company | | New Jersey |
| Pennsylvania-American Water Company | | Corporation | | Pennsylvania |
| Tennessee-American Water Company | | Corporation | | Tennessee |
| TWH LLC | | Limited Liability Company | | Delaware |
| TWNA, Inc. | | Corporation | | Delaware |
| Virginia-American Water Company | | Corporation | | Virginia |
| West Virginia-American Water Company | | Corporation | | West Virginia |