Clean Water Act discharge permit · NPDES SCG646051
CHARLESTON CPW HANAHAN WTP, Hanahan, SC: NPDES SCG646051 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 6Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
CHARLESTON CPW HANAHAN WTP, held by CHARLESTON WATER SYSTEM, holds NPDES permit SCG646051. EPA’s file records it issued December 2, 2015 and expiring December 30, 2020. 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 HANAHAN WTP |
|---|---|
| Permittee as filed | CHARLESTON WATER SYSTEM |
| NPDES ID | SCG646051 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 2, 2015 |
| Expiration date | December 30, 2020 |
| Issuing agency | State |
| Address | Hanahan, SC 29410 |
| Subwatershed | Goose Creek (HUC 030502010706) |
| SIC | 4941 – Water Supply |
| Other EPA IDs (FRS) | RCRA handler SCD987596814; ICIS-AIR source SC00004200072 |
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
- 10Pollutants on file
- 6Under a numeric limit
- 10With 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 |
|---|---|---|---|---|---|
| Chlorine, total residual | 2 | 193 | 117 | January 31, 2025 | 1,150% over the limit |
| pH | 2 | 193 | 1 | January 31, 2023 | |
| Solids, total suspended | 2 | 193 | 1 | September 30, 2022 | 250% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 184 | 0 | ||
| Phosphorus, total [as P] | 2 | 176 | 0 | ||
| Iron, total [as Fe] | 0 | 92 | 0 | ||
| Manganese, total [as Mn] | 0 | 92 | 0 | ||
| Aluminum, total [as Al] | 0 | 82 | 0 | ||
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 0 | 4 | 0 | ||
| Pass/Fail Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | 1 | 2 | 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 SCG646051.
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 SCG646051 there.
Nearby on the register
- Discharge permits in Hanahan
- Every permit record in Hanahan, 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 October 14, 2026.