**Exhibit 21.1**

**SOUTHWEST WATER COMPANY AND SUBSIDIARIES**

###### **Subsidiaries of the Registrant**

| ** **                                   | ** ** | **Jurisdiction of** |
|----------------------------------------------|------------|---------------------|
| **Name of  Subsidiary / Affiliate**          | ** ** | **Incorporation**   |
|                                         |       |                |
| Aqua Services, LP                            |       | Texas               |
| AquaSource Services I, LLC                   |       | Delaware            |
| AquaSource Services II, LLC                  |       | Delaware            |
| CDC Maintenance, Inc.                        |       | Texas               |
| CHA Utilities, LLC.                          |       | Texas               |
| CHA Utility Company, LTD.                    |       | Texas               |
| ECO Capistrano Valley, Inc.                  |       | Delaware            |
| ECO Resources, Inc.                          |       | Texas               |
| ECO Southern California, Inc. *              |       | California          |
| Hornsby Bend Utility Company                 |       | Texas               |
| Inland Pacific Development Company, LLC *    |       | Delaware            |
| Inland Pacific Water Company *               |       | California          |
| Inverness Utility Company, Inc.              |       | Texas               |
| Lab-tech Corporation *                       |       | Texas               |
| METRO-H2O Utilities, Inc.                    |       | Texas               |
| Mid-Tex Utility Company, Inc.                |       | Texas               |
| Midway Water Utilities, Inc.                 |       | Texas               |
| Monarch Utilities I, LP                      |       | Texas               |
| Monarch Utilities, Inc.                      |       | Texas               |
| Monarch Utilities, LLC                       |       | Texas               |
| New Mexico Utilities, Inc.                   |       | New Mexico          |
| Novus Utilities, Inc.                        |       | Delaware            |
| Operations Technologies, Inc.                |       | Georgia             |
| Southwest Environmental Laboratories, Inc.   |       | Texas               |
| Southwest Water Alabama, Inc.                |       | Alabama             |
| Southwest Water Florida, Inc. *              |       | Florida             |
| Southwest Water Government Services Company  |       | Delaware            |
| Southwest Water Services Group Houston, Inc. |       | Delaware            |
| Southwest Water Mississippi, Inc.            |       | Mississippi         |
| Suburban Water Systems                       |       | California          |
| SW Resource Management Company               |       | Delaware            |
| SW Utility Company                           |       | Texas               |
| Tenkiller Utility Company                    |       | Oklahoma            |
| TWC Utility Company, LLC                     |       | Texas               |
| Wastewater Rehabilitation Inspections, Inc.  |       | Texas               |
| Water Quality Management Corporation         |       | Colorado            |
| Water Suppliers Mobile Communication Service |       | California          |
| Windermere Utility Company                   |       | Texas               |

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* - Inactive

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