Clean Water Act discharge permit · NPDES LA0059030
ENTERGY LOUISIANA, LLC- ROY S. NELSON PLANT (COAL UNIT 6), Westlake, LA: NPDES LA0059030 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 37Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
ENTERGY LOUISIANA, LLC- ROY S. NELSON PLANT (COAL UNIT 6), held by Entergy Louisiana, LLC- Roy S. Nelson Plant (Coal Unit 6), holds NPDES permit LA0059030, which discharges to Houston River. EPA’s file records it issued December 15, 2015 and expiring December 31, 2020.
Identity
| Facility as filed | ENTERGY LOUISIANA, LLC- ROY S. NELSON PLANT (COAL UNIT 6) |
|---|---|
| Permittee as filed | Entergy Louisiana, LLC- Roy S. Nelson Plant (Coal Unit 6) |
| NPDES ID | LA0059030 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 15, 2015 |
| Expiration date | December 31, 2020 |
| Address | Westlake, LA 70669 |
| Receiving water | HOUSTON RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Richards Lake-Houston River (HUC 080802050405) |
| SIC | 4911 – Electric Services |
| Other EPA IDs (FRS) | RCRA handler LAD034308577; ICIS-AIR source LA0000002201900157 |
Effluent limits and exceedances
- 37Pollutants on file
- 37Under a numeric limit
- 20With a violation of any kind
- 4With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 15 | 24 | 3 | July 31, 2026 | 1,039% over the limit |
| Solids, total suspended | 9 | 13 | 2 | January 31, 2022 | 440% over the limit |
| pH | 10 | 19 | 1 | September 30, 2017 | |
| Chlorine, free available | 2 | 9 | 1 | November 30, 2018 | 88% over the limit |
| Oil and grease | 6 | 9 | 0 | ||
| Carbon, tot organic [TOC] | 4 | 6 | 0 | ||
| Temperature, water deg. fahrenheit | 2 | 4 | 0 | ||
| BOD, 5-day, 20 deg. C | 2 | 3 | 0 | ||
| Coliform, fecal general | 2 | 3 | 0 | ||
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | 2 | 2 | 0 | ||
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | 2 | 2 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 2 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 2 | 0 | ||
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | 2 | 2 | 0 | ||
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | 2 | 2 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 2 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 2 | 0 | ||
| Coef Of Var Static Renewal 48Hr Acute D. pulex | 1 | 1 | 0 | ||
| Coef Of Var Static Renewal 48Hr Acute Pimephales promelas | 1 | 1 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 1 | 1 | 0 | ||
| Zinc, total [as Zn] | 4 | 0 | 0 | ||
| Whole effluent toxicity - retest #1 | 4 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 4 | 0 | 0 | ||
| WET, sublethal retest #1 | 4 | 0 | 0 | ||
| WET, sublethal retest #2 | 4 | 0 | 0 | ||
| Whole Effluent Toxicity - Retest #3 | 4 | 0 | 0 | ||
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 4 | 0 | 0 | ||
| Chromium, total [as Cr] | 2 | 0 | 0 | ||
| Copper, total [as Cu] | 2 | 0 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 2 | 0 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 2 | 0 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 0 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 0 | 0 | ||
| Lead, total [as Pb] | 1 | 0 | 0 | ||
| Benzene | 1 | 0 | 0 | ||
| BTEX | 1 | 0 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 1 | 0 | 0 |
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES LA0059030.
Inspections
EPA’s inspection file holds no inspection for NPDES LA0059030.
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES LA0059030.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.