How many wastewater permits expire in Louisiana in 2027?

28 NPDES permits held by publicly owned wastewater treatment plants in Louisiana expire in 2027, covering a combined average flow of 14 MGD. The busiest month is Dec 2027 with 6 expiries.

What happens when an NPDES permit expires?

The plant must have applied for renewal at least 180 days before the expiry date. If the agency has not reissued the permit by then, the old permit is administratively continued and stays enforceable. The reissued permit typically carries updated effluent limits based on the latest water-quality standards, which is what drives upgrade projects.

Which is the largest plant with a permit expiring in Louisiana in 2027?

St. Charles Parish Council--Destrehan WWTP in Destrehan, treating about 3.1 MGD under permit LA0073539, expiring Jul 2027.

How do I get contacts for the plants on this list?

Every plant links to its profile with flow, permit and compliance data. Treatment technology and verified decision-maker contacts for each plant, and the same list for every state and year, are available in Klarifi with a free account.

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Louisiana wastewater permits expiring in 2027

Name: Louisiana NPDES permits expiring in 2027
Creator: Klarifi
License: https://klarifi.io/terms-of-service

28 NPDES permits · 14 MGD combined average flow

28 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.

Other years:

2026 (16)2028 (72)All Louisiana NPDES permits →

Publicly owned wastewater treatment plants in Louisiana with NPDES permits expiring in 2027, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Violations (3y)
Sewerage District No. 1 Of Tangipahoa Parish- Bedico Regional Stf	Ponchatoula	0.25	LA0122611	Jan 2027	245
Ville Platte, City Of	Ville Platte	0.77	LA0038814	Mar 2027	182
Suma Crossing STP	Livingston	0.23	LA0125148	Mar 2027	103
Sewerage District #1 Of Iberia Parish & City Of New Iberia- Tete Bayou WWTP	New Iberia	1.6	LA0065251	Apr 2027	115
New Roads, City Of- Wastewater Treatment Plant	New Roads	0.71	LA0038555	Apr 2027	63
Merryville, Town Of - Wastewater Treatment Facility	Merryville	0.17	LA0055867	Apr 2027	47
Town Of Sarepta - WWTP	Sarepta	0.08	LA0104647	Apr 2027	27
Estherwood, Village Of-Estherwood STP	Estherwood	0.0012	LA0064530	Apr 2027	86
St. Charles Parish Council--Destrehan WWTP	Destrehan	3.1	LA0073539	Jul 2027	0
Vermillion Parish Solid Waste Landfill	Abbeville	0.74	LA0056031	Jul 2027	80
Madisonville Town Of	Madisonville	0.13	LA0039730	Jul 2027	22
Linwood Subdivision East	Opelousas	0.08	LA0057401	Jul 2027	26
Riverbend Oxidation Pond - Poydras-Verret Wetland	Chalmette	0.44	LA0040185	Aug 2027	183
Town Of Vidalia Waste Water Treatment Plant	Vidalia	0.36	LA0032794	Sep 2027	0
West Ouachita Industrial Park S.T.P.	West Monroe	0.02	LA0038351	Sep 2027	10
Breaux Bridge Wastewater Treatment Plant	Breaux Bridge	1.21	LA0033014	Oct 2027	22
Independence, Town Of- Wastewater Treatment Plant	Independence	0.41	LA0042544	Oct 2027	55
Town Of Evergreen Water System-Polyphosphate Well 2	Evergreen	0.02	LA0066893	Nov 2027	7
St James Parish Government - District 5 Senior Center	St. James	0.0014	LAG536035	Nov 2027	0
Plaquemines Parish Government- Empire Boat Harbor	Empire	0.0002	LAG536554	Nov 2027	0
City Of Covington	Covington	0.0001	LAG531556	Nov 2027	1
Sterlington, Town Of	Sterlington	—	LA0046809	Nov 2027	85
Delhi, Town Of - WWTP	Delhi	1.41	LA0039802	Dec 2027	100
St John The Baptist Parish- Reserve WWTP	Reserve	1.29	LA0127097	Dec 2027	19
North Oxidationpond	Jonesboro	0.58	LA0046477	Dec 2027	86
Port Of Iberia WWTP	New Iberia	0.04	LA0092550	Dec 2027	28
Dry Prong, Town Of	Dry Prong	0.01	LA0064963	Dec 2027	55
Clarence Sewage Treatment Plant	Clarence	0.007	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 October 26, 2026.

Wastewater terms: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · Centrate · Ozonation · 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 2027: Louisiana wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/louisiana/permits-expiring/2027

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