Clean Water Act discharge permit · NPDES SC0002020
DOMINION ENERGY SOUTH CAROLINA, INC./CANADYS STATION, Walterboro, SC: NPDES SC0002020 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 12Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
DOMINION ENERGY SOUTH CAROLINA, INC./CANADYS STATION, held by DOMINION ENERGY SOUTH CAROLINA INC, holds NPDES permit SC0002020. EPA’s file records it issued December 20, 2016 and expiring March 31, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | DOMINION ENERGY SOUTH CAROLINA, INC./CANADYS STATION |
|---|---|
| Permittee as filed | DOMINION ENERGY SOUTH CAROLINA INC |
| NPDES ID | SC0002020 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 20, 2016 |
| Expiration date | March 31, 2022 |
| Issuing agency | State |
| Address | Walterboro, SC 29488 |
| Subwatershed | Skull Branch-Edisto River (HUC 030502060108) |
| NAICS | 221112 – Fossil Fuel Electric Power Generation |
| SIC | 4911 – Electric Services |
| Other EPA IDs (FRS) | RCRA handler SCD036073799 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 14Pollutants on file
- 12Under a numeric limit
- 11With a violation of any kind
- 2With 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 |
|---|---|---|---|---|---|
| pH | 6 | 43 | 3 | November 30, 2009 | |
| Solids, total suspended | 6 | 41 | 1 | April 30, 2009 | 8% over the limit |
| Flow, in conduit or thru treatment plant | 6 | 43 | 0 | ||
| Oil & Grease | 6 | 38 | 0 | ||
| Oil and grease visual | 3 | 18 | 0 | ||
| Floating solids, waste or visible foam-visual | 2 | 18 | 0 | ||
| Number of Events | 1 | 8 | 0 | ||
| Duration of discharge | 1 | 8 | 0 | ||
| Mercury, total [as Hg] | 4 | 2 | 0 | ||
| Oil and grease, hexane extr method | 0 | 2 | 0 | ||
| Arsenic, total [as As] | 0 | 2 | 0 | ||
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 0 | 0 | ||
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 2 | 0 | 0 | ||
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES SC0002020.
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.
Watch this permit
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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 SC0002020 there.
Nearby on the register
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- Every permit record in South Carolina, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.