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Duke Energy Carolinas, LLC - Oconee Nuclear Station

Electric Services, major discharger, Seneca, South Carolina. NPDES permit SC0000515 expired Sep 30, 2013; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: outfall 001 form 1 monthly (9 values), outfall 002 form 1 monthly (10 values), outfall 002 form 3 quarterly (2 values), outfall 002 form 4 quarterly (1 value), outfall 004 form 1 monthly (7 values), outfall 005 form 1 monthly (10 values), and 2 more forms
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 72 reports late

Limits in force (48)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year001
Temperature, water deg. fahrenheitdaily maximum≤ 103 deg Fall year001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year001
Temperature, water deg. fahrenheitdaily maximum≤ 100 deg Fall 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
Temp. diff. between intake and dischargedaily maximum≤ 22 deg Fall year001
pHinstantaneous minimum≥ 6 SUall year002
pHinstantaneous maximum≤ 8.5 SUall year002
Solids, total suspendedmonthly average≤ 21.7 mg/Lall year002
Solids, total suspendeddaily maximum≤ 43.8 mg/Lall year002
Oil & Greasemonthly average≤ 3.07 mg/Lall year002
Oil & Greasedaily maximum≤ 4.09 mg/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, total residualmonthly average≤ .011 mg/Lall year002
Chlorine, total residualdaily maximum≤ .019 mg/Lall year002
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average≤ 25 %all year002
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximum≤ 40 %all year002
Pass/Fail Static 48Hr Acute Ceriodaphnia dubiadaily maximum≤ 0 pass=0;fail=1all year002
pHinstantaneous maximum≤ 8.5 SUall year004
pHinstantaneous minimumreport only (SU)all year004
pHinstantaneous maximumreport only (SU)all year004
pHinstantaneous minimum≥ 6 SUall year004
pHinstantaneous maximum≤ .1 SUall 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
Solids, total suspendedmonthly average≤ 30 mg/Lall year005
Solids, total suspendeddaily maximum≤ 100 mg/Lall year005
Oil & Greasemonthly average≤ 15 mg/Lall year005
Oil & Greasedaily maximum≤ 20 mg/Lall year005
Iron, total recoverablemonthly average≤ 1 mg/Lall year005
Iron, total recoverabledaily maximum≤ 1 mg/Lall year005
Copper, total recoverablemonthly average≤ 1 mg/Lall year005
Copper, total recoverabledaily maximum≤ 1 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
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year006
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all year006
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all year006
Selenium, total recoverabledaily maximumreport only (mg/L)all year006
Zinc, total recoverabledaily maximumreport only (mg/L)all year006
Copper, total recoverabledaily maximumreport only (mg/L)all 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
Oil and grease visualdaily maximum≤ 0 N=0;Y=1all year007

How strict are these limits?

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

Same industry: the 17 Electric Services permits in South Carolina.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SC0000515 · MCP: https://passage-data.com/mcp