**Exhibit 21.1**

 

**Southwest Water Company and Subsidiaries**

**Subsidiaries of the Registrant**

 
| ** **                                             | ** ** | **Jurisdiction of** |
|--------------------------------------------------------|------------|--------------------------|
| ** **                                             | ** ** | **Incorporation/**       |
| **Name of Subsidiary / Affiliate** | ** ** | **Organization**         |
|                                                   |       |                     |
| Aqua  Services, LP                                     |       | Texas                    |
| AquaSource  Services I, LLC                            |       | Delaware                 |
| AquaSource  Services II, LLC                           |       | Delaware                 |
| CDC  Maintenance, Inc.                                 |       | Texas                    |
| CHA  Utilities Company, Ltd.                           |       | Texas                    |
| CHA  Utilities, L.L.C.                                 |       | Texas                    |
| Colorado  Bend Utilities, L.L.C.                       |       | Texas                    |
| Crossroads  Utilities, Ltd.                            |       | Texas                    |
| Diamond  Water Company                                 |       | Texas                    |
| ECO  Capistrano Valley, Inc.                           |       | Delaware                 |
| ECO  Resources, Inc.                                   |       | Texas                    |
| Hornsby Bend  Utility Company, Inc.                    |       | Texas                    |
| Huntington  Utility Company, L.L.C.                    |       | Texas                    |
| IU Merger  Subsidiary, Inc.                            |       | Texas                    |
| Inland  Pacific Water Company                          |       | California               |
| Inverness  Utility Company, Inc.                       |       | Texas                    |
| Lab-Tech  Corporation                                  |       | Texas                    |
| METRO-H2O  Utilities, Inc.                             |       | Texas                    |
| METRO-H2O  Utilities, Ltd.                             |       | Texas                    |
| Mid-Tex  Utilities, Inc.                               |       | Texas                    |
| Midway Water  Utilities, Inc.                          |       | Texas                    |
| Monarch  Utilities I L.P.                              |       | Texas                    |
| Monarch  Utilities, Inc.                               |       | Texas                    |
| New Mexico  Utilities, Inc.                            |       | New Mexico               |
| North County  Water Reclamation, Inc.                  |       | Alabama                  |
| Novus  Utilities, Inc.                                 |       | Delaware                 |
| Operations  Technologies, Inc.                         |       | Georgia                  |
| Southwest  Environmental Laboratories, Inc.            |       | Texas                    |
| Southwest  Water Alabama OnSite System Services, LLC   |       | Alabama                  |
| Southwest  Water Alabama, Inc.                         |       | Alabama                  |
| Southwest  Water Florida, Inc.                         |       | Florida                  |
| Southwest  Water Government Services Company           |       | Delaware                 |
| Southwest  Water Mississippi, Inc.                     |       | Mississippi              |
| Southwest  Water Services Group Houston, Inc.          |       | Delaware                 |
| Suburban  Water Systems                                |       | California               |
| SW Resource  Management Company                        |       | Delaware                 |
| SW Utility  Company                                    |       | Texas                    |
| SWWC  Enterprises, Inc.                                |       | Delaware                 |
| SWWC  Services, Inc.                                   |       | Delaware                 |
| SWWC  Utilities, Inc.                                  |       | Delaware                 |
| Tenkiller  Utility Company                             |       | Oklahoma                 |
| Texas Water  Services Group, LLC                       |       | Texas                    |
| TWC Utility  Company, LLC                              |       | Texas                    |
| Wastewater  Rehabilitation Inspections, Inc.           |       | Texas                    |
| Water  Quality Management Corporation                  |       | Colorado                 |
| Water  Services, Inc.                                  |       | Texas                    |
| Water  Suppliers Mobile Communication Service          |       | California               |
| Windermere  Utility Co., Inc.                          |       | Texas                    |

 

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