Louisiana wastewater permits expiring in 2027
25 NPDES permits · 11 MGD combined average flow
25 publicly owned wastewater treatment plants in Louisiana hold NPDES permits that expire during 2027, issued by Louisiana Department of Environmental Quality. 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 | Technology | Violations (3y) |
|---|---|---|---|---|---|---|
| Sewerage District No. 1 Of Tangipahoa Parish- Bedico Regional Stf | Ponchatoula | 0.23 | LA0122611 | Jan 2027 | — | 262 |
| Ville Platte, City Of | Ville Platte | 0.64 | LA0038814 | Mar 2027 | Carrousels / oxidation ditches | 181 |
| Suma Crossing STP | Livingston | 0.1 | LA0125148 | Mar 2027 | — | 105 |
| Sewerage District #1 Of Iberia Parish & City Of New Iberia- Tete Bayou WWTP | New Iberia | 1.27 | LA0065251 | Apr 2027 | Clarifiers, Aerated lagoons | 108 |
| New Roads, City Of- Wastewater Treatment Plant | New Roads | 0.7 | LA0038555 | Apr 2027 | Uncovered lagoons | 63 |
| Merryville, Town Of - Wastewater Treatment Facility | Merryville | 0.22 | LA0055867 | Apr 2027 | — | 48 |
| Town Of Sarepta - WWTP | Sarepta | 0.05 | LA0104647 | Apr 2027 | — | 25 |
| Estherwood, Village Of-Estherwood STP | Estherwood | 0.0008 | LA0064530 | Apr 2027 | — | 86 |
| St. Charles Parish Council--Destrehan WWTP | Destrehan | 2.27 | LA0073539 | May 2027 | Clarifiers | 0 |
| Vermillion Parish Solid Waste Landfill | Abbeville | 0.36 | LA0056031 | Jul 2027 | — | 107 |
| Madisonville Town Of | Madisonville | 0.06 | LA0039730 | Jul 2027 | — | 22 |
| Linwood Subdivision East | Opelousas | 0.02 | LA0057401 | Jul 2027 | — | 27 |
| Riverbend Oxidation Pond - Poydras-Verret Wetland | Chalmette | 0.28 | LA0040185 | Aug 2027 | — | 179 |
| Breaux Bridge Wastewater Treatment Plant | Breaux Bridge | 1.32 | LA0033014 | Sep 2027 | Uncovered lagoons | 31 |
| Town Of Vidalia Waste Water Treatment Plant | Vidalia | 0.28 | LA0032794 | Sep 2027 | — | 0 |
| West Ouachita Industrial Park S.T.P. | West Monroe | 0.02 | LA0038351 | Sep 2027 | — | 9 |
| Independence, Town Of- Wastewater Treatment Plant | Independence | 0.22 | LA0042544 | Oct 2027 | — | 66 |
| Delhi, Town Of - WWTP | Delhi | 1.1 | LA0039802 | Nov 2027 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 104 |
| St John The Baptist Parish- Reserve WWTP | Reserve | 0.91 | LA0127097 | Nov 2027 | — | 11 |
| Sterlington, Town Of | Sterlington | 0.21 | LA0046809 | Nov 2027 | Uncovered lagoons | 85 |
| Town Of Evergreen Water System-Polyphosphate Well 2 | Evergreen | 0.02 | LA0066893 | Nov 2027 | — | 6 |
| North Oxidationpond | Jonesboro | 0.33 | LA0046477 | Dec 2027 | — | 86 |
| Dry Prong, Town Of | Dry Prong | 0.05 | LA0064963 | Dec 2027 | — | 51 |
| Port Of Iberia WWTP | New Iberia | 0.04 | LA0092550 | Dec 2027 | — | 29 |
| Clarence Sewage Treatment Plant | Clarence | 0.0008 | LA0076236 | Dec 2027 | — | 79 |
Louisiana permit renewals in 2027: 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 September 11, 2026.