| Subsidiary Name | State of Incorporation | Business Name | |||||||||
| California Water Service Company | California | California Water Service Company | |||||||||
| CWS Utility Services | California | CWS Utility Services | |||||||||
| New Mexico Water Service Company | New Mexico | New Mexico Water Service Company | |||||||||
| Washington Water Service Company | Washington | Washington Water Service Company | |||||||||
| Hawaii Water Service Company, Inc. | Hawaii | Hawaii Water Service Company | |||||||||
| HWS Utility Services LLC | Hawaii | HWS Utility Services | |||||||||
| TWSC, Inc. | Texas | TWSC, Inc. | |||||||||