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Entergy Louisiana, LLC- Ninemile Point Generating Station

Electric Services, major discharger, Westwego, Louisiana. NPDES permit LA0003093, in force until Jun 30, 2028. Last 12 months: over a limit once (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (5 values), outfall 001 form DA quarterly (11 values), outfall 001 form PI quarterly (11 values), outfall 003 form A monthly (5 values), outfall 004 form A monthly (5 values), outfall 005 form A monthly (8 values), and 12 more forms
Renewal application due
Jan 2, 2028 · 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, 0 required values missing, 0 of 176 reports late

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

Period endingParameterReportedLimit
September 2026pH, instantaneous minimum5.1881 SU≥ 6 SU

Limits in force (113)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly average≤ 115 deg Fall year001
Temperature, water deg. fahrenheitdaily maximum≤ 118 deg Fall year001
Whole effluent toxicity - retest #148-hour minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #148-hour minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #248-hour minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #248-hour minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all 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
Chlorine, total residualdaily maximum≤ .2 mg/Lall year001
Whole Effluent Toxicity - Retest #348-hour minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity - Retest #348-hour minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity - Retest #3monthly average minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity - Retest #3monthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulexmonthly average minimumreport only (pass=0;fail=1)all year001
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all year001
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year001
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48-hour minimumreport only (%)all year001
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulexmonthly average minimumreport only (%)all year001
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48-hour minimumreport only (%)all year001
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelasmonthly average minimumreport only (%)all year001
Coef Of Var Static Renewal 48Hr Acute D. pulexmaximumreport only (%)all year001
Coef Of Var Static Renewal 48Hr Acute Pimephales promelasmaximumreport only (%)all year001
Temperature, water deg. fahrenheitmonthly average≤ 111 deg Fall year003
Temperature, water deg. fahrenheitdaily maximum≤ 113 deg Fall 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
Chlorine, total residualdaily maximum≤ .2 mg/Lall year003
Temperature, water deg. fahrenheitmonthly average≤ 111 deg Fall year004
Temperature, water deg. fahrenheitdaily maximum≤ 113 deg Fall 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
Chlorine, total residualdaily maximum≤ .2 mg/Lall year004
pHinstantaneous minimum≥ 6 SUall year005
pHinstantaneous maximum≤ 9 SUall year005
Solids, total suspendedmonthly average≤ 30 mg/Lall year005
Solids, total suspendeddaily maximum≤ 100 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
Solids, total suspended, non-algalmonthly average≤ 30 mg/LMay–Sep005
Solids, total suspended, non-algaldaily maximum≤ 100 mg/LMay–Sep005
pHinstantaneous minimum≥ 6 SUall year006
pHinstantaneous maximum≤ 9 SUall year006
Solids, total suspendedmonthly average≤ 30 mg/Lall year006
Solids, total suspendeddaily maximum≤ 100 mg/Lall year006
Oil & Greasedaily maximum≤ 15 mg/Lall year006
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year006
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year006
Solids, total suspended, non-algalmonthly average≤ 30 mg/Lall year006
Solids, total suspended, non-algaldaily maximum≤ 100 mg/Lall year006
pHinstantaneous minimum≥ 6 SUall year007
pHinstantaneous maximum≤ 9 SUall year007
Oil & Greasedaily maximum≤ 15 mg/Lall year007
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year007
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year007
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year007
pHinstantaneous minimum≥ 6 SUall year008
pHinstantaneous maximum≤ 9 SUall year008
Solids, total suspendedmonthly average≤ 30 mg/Lall year008
Solids, total suspendeddaily maximum≤ 100 mg/Lall year008
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year008
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year008
Solids, total suspended, non-algalmonthly average≤ 30 mg/LMay–Sep008
Solids, total suspended, non-algaldaily maximum≤ 100 mg/LMay–Sep008
Copper, total [as Cu]monthly average≤ 1 mg/Lall year105
Copper, total [as Cu]daily maximum≤ 1 mg/Lall year105
Iron, total [as Fe]monthly average≤ 1 mg/Lall year105
Iron, total [as Fe]daily maximum≤ 1 mg/Lall year105
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year105
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year105
Oil & Greasemonthly average≤ 15 mg/Lall year106
Oil & Greasedaily maximum≤ 20 mg/Lall year106
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year106
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year106
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year106
pHinstantaneous minimum≥ 6 SUall year205
pHinstantaneous maximum≤ 9 SUall year205
Solids, total suspendeddaily maximum≤ 90 mg/Lall year205
Solids, total suspendeddaily maximum≤ 90 mg/Lall year205
Oil & Greasedaily maximum≤ 15 mg/Lall year205
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year205
Lead, total [as Pb]daily maximum≤ 50 ug/Lall year205
Benzenedaily maximum≤ 50 ug/Lall year205
BTEXdaily maximum≤ 250 ug/Lall year205
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year205
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year205
Oil & Greasemonthly average≤ 15 mg/Lall year206
Oil & Greasedaily maximum≤ 20 mg/Lall year206
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year206
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year206
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year206
Oil & Greasemonthly average≤ 15 mg/Lall year305
Oil & Greasedaily maximum≤ 20 mg/Lall year305
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year305
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year305
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year305
Oil & Greasemonthly average≤ 15 mg/Lall year306
Oil & Greasedaily maximum≤ 20 mg/Lall year306
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year306
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year306
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year306
Oil & Greasemonthly average≤ 15 mg/Lall year405
Oil & Greasedaily maximum≤ 20 mg/Lall year405
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year405
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year405
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year405
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearIT01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearIT01

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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