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Southern Nuclear Operating Company

Electric Services, major discharger, Columbia, Alabama. NPDES permit AL0024619, in force until Mar 31, 2029. Last 12 months: over a limit once (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form 1 quarterly (20 values), outfall 01A form 1 quarterly (14 values), outfall 01B form 1 quarterly (14 values), outfall 01C form 1 quarterly (12 values), outfall 01D form 1 quarterly (12 values), outfall 01E form 1 quarterly (12 values), and 14 more forms
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 148 reports late

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

Period endingParameterReportedLimitOver by
March 2026E. coli, daily maximum241.1≤ 235 #/100mL3%

Limits in force (223)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly average≤ 81.7 deg FJan, Feb, Mar, Dec001
Temperature, water deg. fahrenheitmonthly average≤ 81.7 deg FJan, Feb, Mar, Dec001
Temperature, water deg. fahrenheitmonthly average≤ 100 deg FApr–Nov001
Temperature, water deg. fahrenheitmonthly average≤ 100 deg FApr–Nov001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jan, Feb, Mar, Dec001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jan, Feb, Mar, Dec001
Temperature, water deg. fahrenheitdaily maximum≤ 111 deg FApr–Nov001
Temperature, water deg. fahrenheitdaily maximum≤ 111 deg FApr–Nov001
pHdaily minimum≥ 6 SUall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
pHdaily maximum≤ 9 SUall year001
Priority Pollutantsdaily maximum≤ 0 ug/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)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
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmonthly average≤ .2 mg/Lall year001
Chlorine, total residualmonthly average≤ .2 mg/Lall year001
Chlorine, total residualdaily maximum≤ .2 mg/Lall year001
Chlorine, total residualdaily maximum≤ .2 mg/Lall year001
Chlorine, free availablemonthly average≤ .2 mg/Lall year001
Chlorine, free availablemonthly average≤ .2 mg/Lall year001
Chlorine, free availabledaily maximum≤ .5 mg/Lall year001
Chlorine, free availabledaily maximum≤ .5 mg/Lall year001
Annual Certification Statementdaily maximum≤ 0 Y=0;N=1all year001
Toxicity [chronic], Ceriodaphnia dubiasingle sample≤ 0 pass=0;fail=1all year001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]single sample≤ 0 pass=0;fail=1all year001
Chlorine, total residual [dsg. time]daily maximum≤ 120 min/dall year01A
Chlorine, total residual [dsg. time]daily maximum≤ 120 min/dall year01A
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year01A
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year01A
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year01A
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year01A
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year01A
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year01A
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year01A
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year01A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01A
Chlorine, total residual [dsg. time]daily maximum≤ 120 min/dall year01B
Chlorine, total residual [dsg. time]daily maximum≤ 120 min/dall year01B
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year01B
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year01B
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year01B
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year01B
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year01B
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year01B
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year01B
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year01B
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01B
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01B
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01B
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01B
pHdaily minimum≥ 6 SUall year01C
pHdaily minimum≥ 6 SUall year01C
pHdaily maximum≤ 9 SUall year01C
pHdaily maximum≤ 9 SUall year01C
Solids, total suspendedmonthly average≤ 30 mg/Lall year01C
Solids, total suspendeddaily maximum≤ 100 mg/Lall year01C
Oil & Greasemonthly average≤ 15 mg/Lall year01C
Oil & Greasedaily maximum≤ 20 mg/Lall year01C
Chromium, total [as Cr]monthly average≤ .5 mg/Lall year01C
Chromium, total [as Cr]monthly average≤ .5 mg/Lall year01C
Chromium, total [as Cr]daily maximum≤ .5 mg/Lall year01C
Chromium, total [as Cr]daily maximum≤ .5 mg/Lall year01C
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01C
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01C
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01C
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01C
Solids, total suspendedmonthly average≤ 30 mg/Lall year01D
Solids, total suspendedmonthly average≤ 30 mg/Lall year01D
Solids, total suspendeddaily maximum≤ 100 mg/Lall year01D
Solids, total suspendeddaily maximum≤ 100 mg/Lall year01D
Oil & Greasemonthly average≤ 15 mg/Lall year01D
Oil & Greasemonthly average≤ 15 mg/Lall year01D
Oil & Greasedaily maximum≤ 20 mg/Lall year01D
Oil & Greasedaily maximum≤ 20 mg/Lall year01D
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01D
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01D
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01D
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01D
Solids, total suspendedmonthly average≤ 30 mg/Lall year01E
Solids, total suspendedmonthly average≤ 30 mg/Lall year01E
Solids, total suspendeddaily maximum≤ 100 mg/Lall year01E
Solids, total suspendeddaily maximum≤ 100 mg/Lall year01E
Oil & Greasemonthly average≤ 15 mg/Lall year01E
Oil & Greasemonthly average≤ 15 mg/Lall year01E
Oil & Greasedaily maximum≤ 20 mg/Lall year01E
Oil & Greasedaily maximum≤ 20 mg/Lall year01E
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01E
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01E
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01E
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01E
Solids, total suspendedmonthly average≤ 30 mg/Lall year01F
Solids, total suspendeddaily maximum≤ 100 mg/Lall year01F
Oil & Greasemonthly average≤ 15 mg/Lall year01F
Oil & Greasedaily maximum≤ 20 mg/Lall year01F
Boron, total [as B]daily maximumreport only (mg/L)all year01F
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01F
Solids, total suspendedmonthly average≤ 30 mg/Lall year01G
Solids, total suspendeddaily maximum≤ 100 mg/Lall year01G
Oil & Greasemonthly average≤ 15 mg/Lall year01G
Oil & Greasedaily maximum≤ 20 mg/Lall year01G
Boron, total [as B]daily maximumreport only (mg/L)all year01G
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01G
Solids, total suspendedmonthly average≤ 30 mg/Lall year01H
Solids, total suspendeddaily maximum≤ 100 mg/Lall year01H
Oil & Greasemonthly average≤ 15 mg/Lall year01H
Oil & Greasedaily maximum≤ 20 mg/Lall year01H
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01H
Solids, total suspendedmonthly average≤ 30 mg/Lall year01I
Solids, total suspendeddaily maximum≤ 100 mg/Lall year01I
Oil & Greasemonthly average≤ 15 mg/Lall year01I
Oil & Greasedaily maximum≤ 20 mg/Lall year01I
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01I
pHdaily minimumreport only (SU)all year024
pHdaily maximumreport only (SU)all year024
Solids, total suspendedmonthly averagereport only (mg/L)all year024
Solids, total suspendeddaily maximumreport only (mg/L)all year024
Oil & Greasedaily maximum≤ 15 mg/Lall year024
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year024
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year024
Chemical Oxygen Demand [COD]monthly averagereport only (mg/L)all year024
Chemical Oxygen Demand [COD]daily maximumreport only (mg/L)all year024
pHdaily minimum≥ 6 SUall year24A
pHdaily minimum≥ 6 SUall year24A
pHdaily maximum≤ 9 SUall year24A
pHdaily maximum≤ 9 SUall year24A
Solids, total suspendedmonthly average≤ 30 mg/Lall year24A
Solids, total suspendeddaily maximum≤ 100 mg/Lall year24A
Oil & Greasemonthly average≤ 15 mg/Lall year24A
Oil & Greasedaily maximum≤ 20 mg/Lall year24A
Chromium, total [as Cr]monthly average≤ .5 mg/Lall year24A
Chromium, total [as Cr]monthly average≤ .5 mg/Lall year24A
Chromium, total [as Cr]daily maximum≤ .5 mg/Lall year24A
Chromium, total [as Cr]daily maximum≤ .5 mg/Lall year24A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year24A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year24A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year24A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year24A
pHdaily minimum≥ 6 SUall year24B
pHdaily minimum≥ 6 SUall year24B
pHdaily maximum≤ 9 SUall year24B
pHdaily maximum≤ 9 SUall year24B
Solids, total suspendedmonthly average≤ 30 mg/Lall year24B
Solids, total suspendedmonthly average≤ 30 mg/Lall year24B
Solids, total suspendeddaily maximum≤ 100 mg/Lall year24B
Solids, total suspendeddaily maximum≤ 100 mg/Lall year24B
Oil & Greasemonthly average≤ 15 mg/Lall year24B
Oil & Greasemonthly average≤ 15 mg/Lall year24B
Oil & Greasedaily maximum≤ 20 mg/Lall year24B
Oil & Greasedaily maximum≤ 20 mg/Lall year24B
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year24B
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year24B
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year24B
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year24B
Chlorine, total residual [dsg. time]daily maximum≤ 120 min/dall year25A
Chlorine, total residual [dsg. time]daily maximum≤ 120 min/dall year25A
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year25A
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year25A
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year25A
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year25A
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year25A
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year25A
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year25A
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year25A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year25A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year25A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year25A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year25A
Chlorine, total residualmonthly averagereport only (mg/L)all year25A
Chlorine, total residualmonthly averagereport only (mg/L)all year25A
Chlorine, total residualdaily maximumreport only (mg/L)all year25A
Chlorine, total residualdaily maximumreport only (mg/L)all year25A
Chlorine, free availablemonthly average≤ .2 mg/Lall year25A
Chlorine, free availablemonthly average≤ .2 mg/Lall year25A
Chlorine, free availabledaily maximum≤ .5 mg/Lall year25A
Chlorine, free availabledaily maximum≤ .5 mg/Lall year25A
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year25B
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year25B
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year25B
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year25B
pHdaily minimum≥ 6 SUall year25B
pHdaily minimum≥ 6 SUall year25B
pHdaily maximum≤ 9 SUall year25B
pHdaily maximum≤ 9 SUall year25B
Solids, total suspendedmonthly average≤ 30 mg/Lall year25B
Solids, total suspendedmonthly average≤ 30 mg/Lall year25B
Solids, total suspendeddaily maximum≤ 45 mg/Lall year25B
Solids, total suspendeddaily maximum≤ 45 mg/Lall year25B
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year25B
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year25B
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year25B
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year25B
E. colimonthly average≤ 126 #/100mLall year25B
E. colimonthly average≤ 126 #/100mLall year25B
E. colidaily maximum≤ 235 #/100mLall year25B
E. colidaily maximum≤ 235 #/100mLall year25B
Chlorine, total residual [dsg. time]daily maximum≤ 120 min/dall year27A
Chlorine, total residual [dsg. time]daily maximum≤ 120 min/dall year27A
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year27A
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year27A
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year27A
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year27A
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year27A
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year27A
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year27A
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year27A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year27A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year27A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year27A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year27A
Chlorine, total residualmonthly averagereport only (mg/L)all year27A
Chlorine, total residualmonthly averagereport only (mg/L)all year27A
Chlorine, total residualdaily maximumreport only (mg/L)all year27A
Chlorine, total residualdaily maximumreport only (mg/L)all year27A
Chlorine, free availablemonthly average≤ .2 mg/Lall year27A
Chlorine, free availablemonthly average≤ .2 mg/Lall year27A
Chlorine, free availabledaily maximum≤ .5 mg/Lall year27A
Chlorine, free availabledaily maximum≤ .5 mg/Lall year27A

How strict are these limits?

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

Same industry: the 23 Electric Services permits in Alabama.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AL0024619 · MCP: https://passage-data.com/mcp