| Company/Utility Name | State Region | County | MAA On File |
| Cartwright Creek, LLC | Middle | Williamson | No |
| CEC, inc. | Middle | | No |
| City of Alcoa | East | Blount | No |
| City of Clarksville Gas and Water Department | Middle | Montgomery | No |
| City Of Cowan | Middle | Franklin | No |
| City of Johnson City Water & Sewer Services Department | East | Washington | No |
| City of Kingsport | East | Sullivan | Yes |
| City of Munford | West | Tipton | No |
| Claiborne OEMHS | East | Claiborne | No |
| Consolidated Nullear Security | East | Anderson | No |
| Cunningham Utility District | Middle | Montgomery | No |
| Duck River Utility Commission | Middle | Coffee | No |
| Erwin Utilities | East | | No |
| Gallatin Public Utilities | Middle | Sumner | Yes |
| Gibson County Municipal Water District | West | Gibson | No |
| Greeneville Water Commission | East | Greene | Yes |
| Hamilton County Office of Emergency Management & Homeland Security | East | Hamilton | Yes |
| Harpeth Valley Utilities District | Middle | Davidson | No |
| Harpeth Wastewater Cooperative/Berrys Chapel Utility Inc | Middle | Williamson | No |
| Hendersonville Utility District | Middle | Sumner | Yes |
| Jackson Energy Authority | West | Madison | Yes |
| Mallory Valley Utility District | Middle | Williamson | Yes |
| Metro Water Services | Middle | Davidson | Yes |
| Metro Water Services | Middle | | No |
| Milan Public Utilities | West | Gibson | Yes |
| Milcrofton Utility District | Middle | Williamson | Yes |
| Murfreesboro Water Resources Department | Middle | Rutherford | Yes |
| Niota Waterworks | East | McMinn | Yes |
| Paris Board of Public Utilities | West | Henry | No |
| Roane Central Utility | East | Roane | No |
| Roger Springs Lake POA | West | Hardeman | Yes |
| Rutherford County Emergency Management Agency | Middle | Rutherford | No |
| South Giles Utility District | Middle | Giles | Yes |
| TAUD | NA | NA | No |
| TAUD | NA | NA | No |
| TDEC | NA | NA | No |
| TEMA | Middle | Davidson | No |
| TEMA | NA | NA | No |
| Tennessee American Water | East | Hamilton | Yes |
| Tennessee Division of Water Resources | NA | Davidson | No |
| Tennessee Wastewater Systems, Inc. | Middle | Rutherford | Yes |
| Tennessee Water Service, Inc | East | Sevier | Yes |
| Town of Atoka Water and Wastewater | West | Tipton | No |
| Town of Oliver Springs | East | Anderson | No |
| West Tennessee Public Utility District | West | Carroll | No |
| White House Utility District | Middle | Robertson | No |