TNWARN Members
| Type | Utility/Company | State Region | County |
| Water & Wastewater | Camden Water & Sewer | West | Benton |
| | Columbia Power & Water Systems | | |
| | First Utility District of Knox County | | |
| Government | Germantown Water System | West | Tennessee |
| Water & Wastewater | Humboldt Utilities Authority | West | Gibson |
| Water & Wastewater | Johnson City Water & Sewer | East | Washington |
| Water & Wastewater | Metro Water Services | Middle | Davidson |
| | Murfreesboro Water Resources Department | | |
| Water & Wastewater | Sweetwater Utilities Board | East | Monroe |
| Association | TAUD | NA | NA |