Clean Water Act discharge permit · NPDES SC0021229
CHARLESTON CPW PLUM ISLAND, Charleston, SC: NPDES SC0021229 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 14Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
CHARLESTON CPW PLUM ISLAND, held by CHARLESTON WATER SYSTEM, holds NPDES permit SC0021229. EPA’s file records it issued May 23, 2022 and expiring July 31, 2024. 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 | CHARLESTON CPW PLUM ISLAND |
|---|---|
| Permittee as filed | CHARLESTON WATER SYSTEM |
| NPDES ID | SC0021229 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | May 23, 2022 |
| Expiration date | July 31, 2024 |
| Issuing agency | State |
| Address | Charleston, SC 29412 |
| Subwatershed | Lower Ashley River (HUC 030502010605) |
| Program components on file | POTW, Pretreatment |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | ICIS-AIR source SC00005600025 |
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
- 16Pollutants on file
- 14Under a numeric limit
- 8With a violation of any kind
- 6With 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 |
|---|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 2 | 20 | 20 | April 30, 2014 | 59% over the limit |
| Coliform, fecal general | 0 | 14 | 14 | December 31, 2013 | 99,999% over the limit |
| Enterococci | 4 | 14 | 8 | September 30, 2025 | 99,999% over the limit |
| Pass/Fail Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 0 | 3 | 3 | November 30, 2006 | |
| Solids, total suspended | 4 | 1 | 1 | October 31, 2015 | 22% over the limit |
| % Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 2 | 1 | 1 | July 31, 2024 | 12% over the limit |
| Chlorine, total residual | 4 | 2 | 0 | ||
| Oxygen, dissolved [DO] | 2 | 1 | 0 | ||
| Nitrogen, ammonia total [as N] | 8 | 0 | 0 | ||
| Oxygen demand, ultimate | 4 | 0 | 0 | ||
| Nitrogen, total [as N] | 4 | 0 | 0 | ||
| Phosphorus, total [as P] | 4 | 0 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 4 | 0 | 0 | ||
| pH | 2 | 0 | 0 | ||
| Solids, suspended percent removal | 1 | 0 | 0 | ||
| Carbonaceous oxygen demand, % removal | 1 | 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
- 7Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 29, 2022 | Permit Violations - Violation Specified in Comment | ST6 |
| July 29, 2022 | Pretreatment - Failure to Meet Inspection and Sampling Plan for SIUs | ST6 |
| July 29, 2022 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| February 10, 2022 | Pretreatment - Failure to Meet Inspection and Sampling Plan for SIUs | ST6 |
| February 10, 2022 | Pretreatment - Failure to Conduct Inspections | ST6 |
| July 31, 2020 | Management Practice Violations - Failure to Maintain Records | ST6 |
| July 31, 2020 | Permit Violations - Violation Specified in Comment | 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 SC0021229 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.