Clean Water Act discharge permit · NPDES SC0004278
DUKE ENERGY CAROLINAS LLC/CATAWBA NUCLEAR STATION, York, SC: NPDES SC0004278 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 0Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
DUKE ENERGY CAROLINAS LLC/CATAWBA NUCLEAR STATION, held by Duke Energy Carolinas LLC - Catawba Nuclear Station, holds NPDES permit SC0004278. EPA’s file records it issued December 29, 2021 and expiring December 31, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | DUKE ENERGY CAROLINAS LLC/CATAWBA NUCLEAR STATION |
|---|---|
| Permittee as filed | Duke Energy Carolinas LLC - Catawba Nuclear Station |
| NPDES ID | SC0004278 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 29, 2021 |
| Expiration date | December 31, 2023 |
| Issuing agency | State |
| Address | York, SC 29745 |
| Subwatershed | Allison Creek (HUC 030501011506) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 20Pollutants on file
- 0Under a numeric limit
- 20With a violation of any kind
- 3With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 13 | 6 | June 30, 2019 | |
| Coliform, fecal general | 0 | 8 | 4 | July 31, 2005 | 99,999% over the limit |
| Iron, total [as Fe] | 0 | 12 | 2 | June 30, 2021 | 10% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 40 | 0 | ||
| pH | 0 | 37 | 0 | ||
| Temperature, water deg. fahrenheit | 0 | 32 | 0 | ||
| Chlorine, total residual | 0 | 30 | 0 | ||
| Solids, total suspended | 0 | 12 | 0 | ||
| BOD, 5-day, 20 deg. C | 0 | 10 | 0 | ||
| Copper, total [as Cu] | 0 | 10 | 0 | ||
| Hydrazine | 0 | 10 | 0 | ||
| Temp. diff. between samp. & upstrm deg. F | 0 | 8 | 0 | ||
| Oil and grease, hexane extr method | 0 | 8 | 0 | ||
| Copper, total recoverable | 0 | 8 | 0 | ||
| Chlorine, free available | 0 | 8 | 0 | ||
| Nitrogen, nitrite total [as N] | 0 | 6 | 0 | ||
| Phosphorus, total [as P] | 0 | 4 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 0 | 4 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 2 | 0 | ||
| Zinc, total [as Zn] | 0 | 1 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 29, 2022 | Management Practice Violations - Failure to Maintain Records | ST6 |
| September 20, 2022 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID SC0004278 there.
Nearby on the register
- Discharge permits in York
- Every permit record in York, A to Z
- Discharge permits in South Carolina
- Every permit record in South Carolina, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.