**Exhibit21.1**

**Southwest Water Company andSubsidiaries**

**Subsidiariesof 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               |
| I.U. Merger Subsidiary, Inc.                        |       | Texas               |
| Inverness Utility Company, Inc.                     |       | Texas               |
| Lab-Tech Corporation                                |       | Texas               |
| METRO-H2O Utilities, Inc.                           |       | Texas               |
| METRO-H2O, 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          |
| 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            |
| Southwest Water Services, Inc.                      |       | Delaware            |
| Southwest Water Utilities, Inc.                     |       | Delaware            |
| Suburban Water Systems                              |       | California          |
| SW Resource Management Company                      |       | Delaware            |
| SW Utility Company                                  |       | Texas               |
| 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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