Clean Water Act discharge permit · NPDES LA0112780
ENTERGY ARKANSAS, LLC- OUACHITA PLANT, Sterlington, LA: NPDES LA0112780 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 26Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
ENTERGY ARKANSAS, LLC- OUACHITA PLANT, held by Entergy Arkansas, LLC- Ouachita Plant, holds NPDES permit LA0112780, which discharges to Ouachita River. EPA’s file records it issued September 29, 2016 and expiring October 31, 2021. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | ENTERGY ARKANSAS, LLC- OUACHITA PLANT |
|---|---|
| Permittee as filed | Entergy Arkansas, LLC- Ouachita Plant |
| NPDES ID | LA0112780 |
| 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 | September 29, 2016 |
| Expiration date | October 31, 2021 |
| Address | Sterlington, LA 71280 |
| Receiving water | OUACHITA RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Jones Bayou-Ouachita River (HUC 080402020705) |
| Other EPA IDs (FRS) | RCRA handler LAR000048744; ICIS-AIR source LA0000002207300111 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 27Pollutants on file
- 26Under a numeric limit
- 23With 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 |
|---|---|---|---|---|---|
| Temperature, water deg. fahrenheit | 2 | 31 | 5 | July 31, 2013 | 6% over the limit |
| pH | 12 | 123 | 3 | September 30, 2007 | |
| Zinc, total [as Zn] | 2 | 71 | 3 | January 31, 2011 | 727% over the limit |
| Solids, total suspended | 7 | 60 | 3 | September 30, 2013 | 70% over the limit |
| Flow, in conduit or thru treatment plant | 14 | 168 | 0 | ||
| Oil and grease | 0 | 149 | 0 | ||
| Chlorine, free available | 2 | 120 | 0 | ||
| Oil & Grease | 7 | 14 | 0 | ||
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | 4 | 14 | 0 | ||
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | 4 | 14 | 0 | ||
| Oxygen demand, chem. [high level] [COD] | 2 | 14 | 0 | ||
| Copper, total [as Cu] | 2 | 14 | 0 | ||
| Iron, total [as Fe] | 2 | 14 | 0 | ||
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | 4 | 12 | 0 | ||
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | 4 | 10 | 0 | ||
| Carbon, tot organic [TOC] | 3 | 10 | 0 | ||
| pH range excursions, > 60 minutes | 1 | 5 | 0 | ||
| Coef Of Var Static Renewal 48Hr Acute Pimephales promelas | 2 | 4 | 0 | ||
| Coef Of Var Static Renewal 48Hr Acute D. pulex | 2 | 2 | 0 | ||
| pH range excursions, monthly total accum | 1 | 2 | 0 | ||
| Lead, total [as Pb] | 1 | 1 | 0 | ||
| Benzene | 1 | 1 | 0 | ||
| BTEX | 1 | 1 | 0 | ||
| Whole effluent toxicity - retest #1 | 8 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 8 | 0 | 0 | ||
| Whole Effluent Toxicity - Retest #3 | 8 | 0 | 0 | ||
| Chromium, total [as Cr] | 2 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| November 30, 2018 | Permit Violations - Violation Specified in Comment | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID LA0112780 there.
Nearby on the register
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- Every permit record in Sterlington, A to Z
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- Every permit record in Louisiana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.