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| Entity | Joined | County |
| Ash Creek SSD | 07/26/2007 | Washington |
| Grand Water & Sewer Service Agency | 09/05/2007 | Grand |
| Hooper Water ID | 03/11/2008 | Weber |
| Kearns Improvement District | 12/11/2007 | Salt Lake |
| Logan City | 07/17/2007 | Cache |
| Milford City | 09/04/2007 | Beaver |
| Monroe City | 09/11/2007 | Sevier |
| North Salt Lake City | 09/4/2007 | Salt Lake |
| Redmond Town | 02/12/2008 | Sevier |
| Salt Lake City Public Utilities | 09/07/2007 | Salt Lake |
| Sandy City | 02/08/2008 | Salt Lake |
| WaterPro | 07/18/2007 | Salt Lake |
| Woods Cross City | 07/17/2007 | Davis |
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