Entergy Operations Inc - Waterford 3 Steam Electric Station — NPDES permit LA0007374: limits, due date and EPA's record

Electric Services, major discharger, Killona, Louisiana. NPDES permit LA0007374, in force until May 31, 2030. Last 12 months: over a limit 2 times (last March 2026), 1 required value missing. Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
March 2026	BOD, 5-day, 20 deg. C, daily maximum	23.9 mg/L	≤ 15 mg/L	59%
March 2026	BOD, 5-day, 20 deg. C, monthly average	13.88 mg/L	≤ 10 mg/L	39%

Limits in force (132)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. fahrenheit	monthly average	report only (deg F)	all year	001
Temperature, water deg. fahrenheit	instantaneous maximum	≤ 118 deg F	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Chlorine, total residual	daily maximum	≤ 211 lb/d	all year	001
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex	48-hour minimum	report only (pass=0;fail=1)	all year	001
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex	monthly average minimum	report only (pass=0;fail=1)	all year	001
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas	48-hour minimum	report only (pass=0;fail=1)	all year	001
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas	monthly average minimum	report only (pass=0;fail=1)	all year	001
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex	48-hour minimum	report only (%)	all year	001
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex	monthly average minimum	report only (%)	all year	001
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas	48-hour minimum	report only (%)	all year	001
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas	monthly average minimum	report only (%)	all year	001
Coef Of Var Static Renewal 48Hr Acute D. pulex	maximum	report only (%)	all year	001
Coef Of Var Static Renewal 48Hr Acute Pimephales promelas	maximum	report only (%)	all year	001
pH	instantaneous minimum	≥ 6 SU	all year	004
pH	instantaneous maximum	≤ 9 SU	all year	004
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	004
Oil & Grease	daily maximum	≤ 15 mg/L	all year	004
Carbon, tot organic [TOC]	daily maximum	≤ 50 mg/L	all year	004
Chromium, total [as Cr]	monthly average	≤ .2 mg/L	all year	004
Chromium, total [as Cr]	daily maximum	≤ .2 mg/L	all year	004
Zinc, total [as Zn]	monthly average	≤ 1 mg/L	all year	004
Zinc, total [as Zn]	daily maximum	≤ 1 mg/L	all year	004
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	004
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	004
Chlorine, free available	monthly average	≤ .2 mg/L	all year	004
Chlorine, free available	daily maximum	≤ .5 mg/L	all year	004
BOD, 5-day, 20 deg. C	monthly average	≤ 10 mg/L	all year	005
BOD, 5-day, 20 deg. C	daily maximum	≤ 15 mg/L	all year	005
pH	instantaneous minimum	≥ 6 SU	all year	005
pH	instantaneous maximum	≤ 9 SU	all year	005
Solids, total suspended	monthly average	≤ 15 mg/L	all year	005
Solids, total suspended	daily maximum	≤ 23 mg/L	all year	005
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	005
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	005
Coliform, fecal general	monthly geometric mean	≤ 200 #/100mL	all year	005
Coliform, fecal general	daily maximum	≤ 400 #/100mL	all year	005
pH	instantaneous minimum	≥ 6 SU	all year	1001
pH	instantaneous maximum	≤ 9 SU	all year	1001
Solids, total suspended	monthly average	≤ 30 mg/L	all year	1001
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	1001
Oil & Grease	monthly average	≤ 15 mg/L	all year	1001
Oil & Grease	daily maximum	≤ 20 mg/L	all year	1001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	1001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	1001
pH	instantaneous minimum	≥ 6 SU	all year	101
pH	instantaneous maximum	≤ 9 SU	all year	101
Solids, total suspended	monthly average	≤ 30 mg/L	all year	101
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	101
Oil & Grease	monthly average	≤ 15 mg/L	all year	101
Oil & Grease	daily maximum	≤ 20 mg/L	all year	101
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	101
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	101
pH	instantaneous minimum	≥ 6 SU	all year	201
pH	instantaneous maximum	≤ 9 SU	all year	201
Solids, total suspended	monthly average	≤ 30 mg/L	all year	201
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	201
Oil & Grease	monthly average	≤ 15 mg/L	all year	201
Oil & Grease	daily maximum	≤ 20 mg/L	all year	201
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	201
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	201
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	301
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	301
pH	instantaneous minimum	≥ 6 SU	all year	401
pH	instantaneous maximum	≤ 9 SU	all year	401
Solids, total suspended	monthly average	≤ 30 mg/L	all year	401
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	401
Oil & Grease	monthly average	≤ 15 mg/L	all year	401
Oil & Grease	daily maximum	≤ 20 mg/L	all year	401
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	401
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	401
pH	instantaneous minimum	≥ 6 SU	all year	501
pH	instantaneous maximum	≤ 9 SU	all year	501
Solids, total suspended	monthly average	≤ 30 mg/L	all year	501
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	501
Oil & Grease	monthly average	≤ 15 mg/L	all year	501
Oil & Grease	daily maximum	≤ 20 mg/L	all year	501
Carbon, tot organic [TOC]	daily maximum	≤ 50 mg/L	all year	501
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	501
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	501
pH	instantaneous minimum	≥ 6 SU	all year	601
pH	instantaneous maximum	≤ 9 SU	all year	601
Solids, total suspended	monthly average	≤ 30 mg/L	all year	601
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	601
Oil & Grease	monthly average	≤ 15 mg/L	all year	601
Oil & Grease	daily maximum	≤ 20 mg/L	all year	601
Carbon, tot organic [TOC]	daily maximum	≤ 50 mg/L	all year	601
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	601
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	601
pH	instantaneous minimum	≥ 6 SU	all year	701
pH	instantaneous maximum	≤ 9 SU	all year	701
Solids, total suspended	monthly average	≤ 30 mg/L	all year	701
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	701
Oil & Grease	monthly average	≤ 15 mg/L	all year	701
Oil & Grease	daily maximum	≤ 20 mg/L	all year	701
Carbon, tot organic [TOC]	daily maximum	≤ 50 mg/L	all year	701
Chromium, total [as Cr]	monthly average	≤ .2 mg/L	all year	701
Chromium, total [as Cr]	daily maximum	≤ .2 mg/L	all year	701
Zinc, total [as Zn]	monthly average	≤ 1 mg/L	all year	701
Zinc, total [as Zn]	daily maximum	≤ 1 mg/L	all year	701
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	701
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	701
Chlorine, free available	monthly average	≤ .2 mg/L	all year	701
Chlorine, free available	daily maximum	≤ .5 mg/L	all year	701
pH	instantaneous minimum	≥ 6 SU	all year	801
pH	instantaneous maximum	≤ 9 SU	all year	801
Solids, total suspended	monthly average	≤ 30 mg/L	all year	801
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	801
Oil & Grease	monthly average	≤ 15 mg/L	all year	801
Oil & Grease	daily maximum	≤ 20 mg/L	all year	801
Carbon, tot organic [TOC]	daily maximum	≤ 50 mg/L	all year	801
Zinc, total [as Zn]	monthly average	≤ 1 mg/L	all year	801
Zinc, total [as Zn]	daily maximum	≤ 1 mg/L	all year	801
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	801
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	801
Chlorine, free available	monthly average	≤ .2 mg/L	all year	801
Chlorine, free available	daily maximum	≤ .5 mg/L	all year	801
pH	instantaneous minimum	≥ 6 SU	all year	901
pH	instantaneous maximum	≤ 9 SU	all year	901
Solids, total suspended	monthly average	≤ 30 mg/L	all year	901
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	901
Oil & Grease	monthly average	≤ 15 mg/L	all year	901
Oil & Grease	daily maximum	≤ 20 mg/L	all year	901
Copper, total [as Cu]	monthly average	≤ 1 mg/L	all year	901
Copper, total [as Cu]	daily maximum	≤ 1 mg/L	all year	901
Iron, total [as Fe]	monthly average	≤ 1 mg/L	all year	901
Iron, total [as Fe]	daily maximum	≤ 1 mg/L	all year	901
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	901
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	901
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	IT01
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	IT01

New limits from Jun 1, 2028

Parameter	New limit	New or tighter	Median, last 12 months	× new limit
Zinc, total [as Zn], daily maximum	0.511 mg/L	tighter	—	—
Zinc, total [as Zn], monthly average	0.215 mg/L	tighter	—	—

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/LA0007374 · MCP: https://passage-data.com/mcp