Tennessee wastewater permits expiring in 2026
16 NPDES permits · 27 MGD combined average flow
16 publicly owned wastewater treatment plants in Tennessee hold NPDES permits that expire during 2026, issued by Tennessee Department of Environment and Conservation. The table lists each plant with its permit number, expiry month, average flow, treatment technology and three-year violation count, in order of expiry.
An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|
| Hampton High School | Elizabethton | 0.007 | TN0023701 | May 2026 | 0 |
| Johnson City STP | Johnson City | 5.94 | TN0024244 | Sep 2026 | 18 |
| Knob Creek Waste Water Plant | Johnson City | 3.26 | TN0024236 | Sep 2026 | 15 |
| Benton STP | Benton | 0.12 | TN0067334 | Oct 2026 | 8 |
| Copperhill STP | Copperhill | — | TN0024449 | Oct 2026 | 0 |
| Henderson STP- South Lagoon | Henderson | 0.35 | TN0064238 | Nov 2026 | 15 |
| Henderson STP- North Lagoon | Henderson | 0.3 | TN0064220 | Nov 2026 | 17 |
| Halls Lagoon | Halls | 0.29 | TN0057291 | Nov 2026 | 4 |
| White Bluff STP (aka Water Authority Of Dickson County) | White Bluff | 0.28 | TN0020460 | Nov 2026 | 7 |
| Henderson STP- East Lagoon | Henderson | 0.16 | TN0026026 | Nov 2026 | 27 |
| Roan Mountain State Park | Roan Mountain | 0.0036 | TN0074357 | Nov 2026 | 51 |
| City Of Franklin Wastewater Treatment Plant | Franklin | 9.77 | TN0028827 | Dec 2026 | 44 |
| Dickson STP | Dickson | 2.91 | TN0066958 | Dec 2026 | 21 |
| Crossville STP | Crossville | 2.81 | TN0024996 | Dec 2026 | 26 |
| Fairview STP | Fairview | 0.49 | TN0062332 | Dec 2026 | 17 |
| Spring City New Lake Rd Plt | Spring City | 0.42 | TN0021261 | Dec 2026 | 14 |
Tennessee permit renewals in 2026: questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed October 26, 2026.
Wastewater terms: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · WWTP · Biosolids · all terms
Cite this page
Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.
Klarifi. “NPDES permits expiring in 2026: Tennessee wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/tennessee/permits-expiring/2026Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.