Louisiana NPDES permit search
Status, expiry and violations for 277 municipal wastewater permits · issued by LDEQ as LPDES permits
In short
How do I look up an NPDES permit in Louisiana?
Search this page by permit number or plant name for a municipal plant’s permit status, expiry date and violations. For the official file, search LDEQ’s EDMS or LDEQ’s public notices. EPA’s ECHO database shows the monitoring results and violations of every permit. The 2,946 industrial permits in Louisiana are listed in Klarifi with a free account.
Links to official sources checked September 2026.
Effective
242
Administratively continued
33
Expired
1
Plants with effluent violations, 3 years
258
Where to find official Louisiana NPDES records
Louisiana Department of Environmental Quality (LDEQ) runs the NPDES program in Louisiana under authorization from EPA Region 6, as the Louisiana Pollutant Discharge Elimination System (LPDES). It issues and enforces the permits and keeps the official file: applications, permits, fact sheets and monitoring reports. LDEQ website ↗
permit documents
LDEQ’s Electronic Document Management System. Search by the facility’s Agency Interest (AI) number, which LDEQ’s public notices and quarterly permit lists show, for the final permit and related documents.
permit documents
Search the table by company or permit number, check that Media is Surface Water and open “View Attachments” for the notice and draft permit.
permits · DMRs · inspections · violations · enforcement
EPA’s Enforcement and Compliance History Online. Search water facilities by permit number, name or city; the Detailed Facility Report lists inspections, violations and enforcement actions, and Effluent Charts plot monitoring results against the permit limits.
- Permit numbers
- Permits follow EPA’s format (LA0127877). LDEQ also gives each facility an Agency Interest number (AI 232172), the key for searching EDMS.
- Discharge monitoring reports
- Through EPA’s NetDMR, to LDEQ.
- Violations and enforcement
- LDEQ’s enforcement actions and settlements ↗
Industrial and commercial NPDES permits in Louisiana
Most NPDES permits are not held by municipal plants. EPA’s permit database lists 2,946 individual permits in force for industrial and commercial facilities in Louisiana (manufacturers, food processors, mines, power plants, landfills), 261 of them major dischargers, plus 7,018 facilities covered by a general permit, mostly for stormwater. 712 of the individual permits recorded at least one effluent violation in the last three years.
| Facility | Permit | Status | Expires | Effluent violations |
|---|
Unlock 2,946 industrial permits in Louisiana
Search every industrial and commercial discharger in Louisiana by name or permit number, with permit status, expiry and violation history. Free with a Klarifi account.
Industrial and commercial NPDES permits in Louisiana: permits in force (effective or administratively continued) held by facilities EPA does not class as publicly owned treatment works or federal facilities. Source: EPA ICIS-NPDES via Klarifi, October 2026.
Violations at Louisiana wastewater plants
258 of the 277 municipal plants on this page recorded at least one effluent violation, a monitored value above a permit limit, in the last three years, and 262 had a violation of any kind, including late or missing monitoring reports. Each plant’s page shows its own count. EPA’s enforcement records list 193 formal cases naming Louisiana wastewater plants, 24 of them since fiscal year 2020, with $1.4 million in penalties assessed. Enforcement cases in Louisiana →
Permit renewals by year
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.
2029: 36 permits
2030: 55 permits
2031: 45 permits
Largest permit holders in Louisiana
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Baton Rouge, City Of | Scotlandville | 20.18 | 54 | LA0036439 | Effective | Jul 2029 | 30 |
| South Wastewater Treatment Plant | Baton Rouge | 41.82 | 54 | LA0036412 | Effective | Jun 2029 | 20 |
| Jefferson Parish Department Of Sewerage- East Bank WWTP | Elmwood | 28.23 | 33 | LA0066630 | Effective | Jul 2028 | 0 |
| St. Bernard Parish - Munster WWTP | Chalmette | 7.08 | 14.5 | LA0040177 | Effective | Aug 2031 | 2 |
| Red River Wastewater Treatment Plant | Bossier City | 4.62 | 12 | LA0053716 | Effective | May 2028 | 0 |
| Wards 5 & 8 Joint Sewerage Commision | Patterson | 3.17 | 12 | LA0068381 | Effective | Sep 2030 | 99 |
| Sewerage & Water Board Of New Orleans Westb Ank Sewage | New Orleans | 13.61 | 10 | LA0038105 | Effective | Nov 2029 | 1 |
| Jefferson Parish Department Of Sewerage- Marrero WWTP | Marrero | 8.08 | 9.6 | LA0042048 | Effective | Oct 2026 | 5 |
| Wastewater Treatment Plant | Pineville | 1.28 | 9 | LA0033464 | Effective | Dec 2030 | 55 |
| Thibodaux, City Of- Wastewater Treatment Facility | Thibodaux | 2.43 | 8 | LA0032948 | Effective | Jul 2029 | 76 |
Louisiana NPDES permits: questions
NPDES permit search in other states
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 12, 2026.
Wastewater terms: NPDES permit · POTW · Significant industrial user · MGD · Biosolids · Filter press · all terms