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Entergy Louisiana, LLC- Roy S. Nelson Plant (Coal Unit 6)

Electric Services, major discharger, Westlake, Louisiana. NPDES permit LA0059030, in force until Apr 30, 2028. Last 12 months: over a limit once (last July 2026), 1 of 61 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form Q quarterly (10 values), outfall 002 form A monthly (7 values), outfall 002 form CD quarterly (9 values), outfall 002 form PI quarterly (9 values), outfall 002 form Q quarterly (2 values), outfall 003 form A monthly (11 values), and 4 more forms
Renewal application due
Nov 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 9 required values missing, 0 of 61 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
July 2026Flow, in conduit or thru treatment plant, 30-day average.119 MGD≤ .071 MGD68%

Limits in force (76)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximum≤ 45 mg/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Coliform, fecal generalmonthly average≤ 200 #/100mLall year001
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year001
Temperature, water deg. fahrenheitinstantaneous maximum≤ 97 deg Fall year002
pHinstantaneous minimum≥ 6 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year002
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year002
Zinc, total [as Zn]monthly average≤ 330 ug/Lall year002
Zinc, total [as Zn]daily maximum≤ 783 ug/Lall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Chlorine, free availablemonthly average≤ .2 mg/Lall year002
Chlorine, free availabledaily maximum≤ .5 mg/Lall year002
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year002
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year002
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year002
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year002
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year002
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year002
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year002
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year002
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year002
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year002
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year002
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year002
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year002
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year002
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year002
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year002
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubiamaximumreport only (%)all year002
Coef Of Var Static Renewal 7Day Chronic Pimephales promelasmaximumreport only (%)all year002
Temperature, water deg. fahrenheitdaily maximum≤ 97 deg Fall year003
pHinstantaneous minimum≥ 6 SUall year003
pHinstantaneous maximum≤ 9 SUall year003
Solids, total suspendedmonthly average≤ 30 mg/Lall year003
Solids, total suspendeddaily maximum≤ 50 mg/Lall year003
Oil & Greasemonthly average≤ 15 mg/Lall year003
Oil & Greasedaily maximum≤ 20 mg/Lall year003
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Flow, in conduit or thru treatment plant30-day average≤ .071 MGDall year003
pHinstantaneous minimum≥ 6 SUall year004
pHinstantaneous maximum≤ 9 SUall year004
Oil & Greasedaily maximum≤ 15 mg/Lall year004
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
pHinstantaneous minimum≥ 6 SUall year005
pHinstantaneous maximum≤ 9 SUall year005
Solids, total suspendedmonthly average≤ 30 mg/Lall year005
Solids, total suspendeddaily maximum≤ 50 mg/Lall year005
Oil & Greasemonthly average≤ 15 mg/Lall year005
Oil & Greasedaily maximum≤ 20 mg/Lall year005
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
pHinstantaneous minimum≥ 6 SUall year303
pHinstantaneous maximum≤ 9 SUall year303
Solids, total suspendeddaily maximum≤ 90 mg/Lall year303
Solids, total suspendeddaily maximum≤ 90 mg/Lall year303
Oil & Greasedaily maximum≤ 15 mg/Lall year303
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year303
Lead, total [as Pb]daily maximum≤ 50 ug/Lall year303
Benzenedaily maximum≤ 50 ug/Lall year303
BTEXdaily maximum≤ 250 ug/Lall year303
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year303
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year303

How strict are these limits?

Cited limits by parameter: Louisiana's rules and the federal ones.

Same industry: the 29 Electric Services permits in Louisiana.

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On EPA ECHO: Facility report · DMR history

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