Entergy Mississippi LLC, Gerald Andrus Plant — NPDES permit MS0001261: limits, due date and EPA's record

Electric Services, major discharger, Greenville, Mississippi. NPDES permit MS0001261, in force until Sep 30, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (48)

Parameter	Statistic	Limit	Months	Outfall
pH	minimum	≥ 6 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Flow, in conduit or thru treatment plant	maximum monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	maximum	report only (MGD)	all year	001
Chlorine, total residual	monthly average	report only (mg/L)	all year	001
Chlorine, total residual	monthly maximum	≤ .5 mg/L	all year	001
Chlorine, free available	monthly average	report only (mg/L)	all year	001
Chlorine, free available	monthly maximum	≤ .2 mg/L	all year	001
Temp. diff. between intake and discharge	monthly average	report only (deg F)	all year	001
Temp. diff. between intake and discharge	monthly maximum	report only (deg F)	all year	001
LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia	minimum	≥ 1 %	all year	001
LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia	daily maximum	report only (%)	all year	001
BOD, 5-day, 20 deg. C	quarterly average	≤ 30 mg/L	all year	002
BOD, 5-day, 20 deg. C	quarterly maximum	≤ 45 mg/L	all year	002
pH	minimum	≥ 6 SU	all year	002
pH	maximum	≤ 9 SU	all year	002
Solids, total suspended	quarterly average	≤ 30 mg/L	all year	002
Solids, total suspended	quarterly maximum	≤ 45 mg/L	all year	002
Flow, in conduit or thru treatment plant	quarterly average	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	quarterly maximum	report only (MGD)	all year	002
Chlorine, total residual	quarterly average	report only (mg/L)	all year	002
Chlorine, total residual	quarterly maximum	≤ .5 mg/L	all year	002
E. coli	quarterly average	≤ 126 #/100mL	all year	002
E. coli	quarterly maximum	≤ 410 #/100mL	all year	002
pH	minimum	≥ 6 SU	all year	003
pH	maximum	≤ 9 SU	all year	003
Solids, total suspended	monthly average	≤ 30 mg/L	all year	003
Solids, total suspended	monthly maximum	≤ 100 mg/L	all year	003
Oil & Grease	monthly average	≤ 15 mg/L	all year	003
Oil & Grease	monthly maximum	≤ 20 mg/L	all year	003
Flow, in conduit or thru treatment plant	maximum weekly average	report only (MGD)	all year	003
Flow, in conduit or thru treatment plant	monthly maximum	report only (MGD)	all year	003
pH range excursions, > 60 minutes	monthly total	≤ 0 occur/mo	all year	003
pH range excursions, monthly total accum	monthly total	≤ 446 min	all year	003
pH	minimum	≥ 6 SU	all year	004
pH	maximum	≤ 9 SU	all year	004
Solids, total suspended	monthly average	≤ 30 mg/L	all year	004
Solids, total suspended	monthly maximum	≤ 100 mg/L	all year	004
Oil & Grease	monthly average	≤ 15 mg/L	all year	004
Oil & Grease	monthly maximum	≤ 20 mg/L	all year	004
Iron, total recoverable	monthly average	≤ 1 mg/L	all year	004
Iron, total recoverable	monthly maximum	≤ 1 mg/L	all year	004
Copper, total recoverable	annual average	≤ 1 mg/L	all year	004
Copper, total recoverable	annual maximum	≤ 1 mg/L	all year	004
Flow, in conduit or thru treatment plant	maximum monthly average	report only (MGD)	all year	004
Flow, in conduit or thru treatment plant	monthly maximum	report only (MGD)	all year	004
pH range excursions, > 60 minutes	monthly total	≤ 0 occur/mo	all year	004
pH range excursions, monthly total accum	monthly total	≤ 446 min	all year	004

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/MS0001261 · MCP: https://passage-data.com/mcp