Clean Water Act discharge permit · NPDES SC0042501
SOUTH ISLAND PSD WWTP, Hilton Head Island, SC: NPDES SC0042501 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 15Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
SOUTH ISLAND PSD WWTP, held by SOUTH ISLAND PUBLIC SERVICE DISTRICT, holds NPDES permit SC0042501. EPA’s file records it issued December 19, 2023 and expiring January 31, 2029. 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 | SOUTH ISLAND PSD WWTP |
|---|---|
| Permittee as filed | SOUTH ISLAND PUBLIC SERVICE DISTRICT |
| NPDES ID | SC0042501 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 19, 2023 |
| Expiration date | January 31, 2029 |
| Issuing agency | State |
| Address | Hilton Head Island, SC 29928 |
| Subwatershed | Broad Creek (HUC 030601100302) |
| Program components on file | POTW, Pretreatment |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4939 – Combination Utilities |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 15Pollutants on file
- 15Under a numeric limit
- 15With a violation of any kind
- 1With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 8 | 9 | 1 | July 31, 2017 | 20% over the limit |
| BOD, 5-day, 20 deg. C | 8 | 8 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 8 | 0 | ||
| Chlorine, total residual | 8 | 6 | 0 | ||
| Coliform, fecal general | 8 | 6 | 0 | ||
| Solids, total suspended | 8 | 4 | 0 | ||
| Nitrogen, total [as N] | 8 | 4 | 0 | ||
| Phosphorus, total [as P] | 8 | 4 | 0 | ||
| Copper, total [as Cu] | 8 | 4 | 0 | ||
| Enterococci | 8 | 4 | 0 | ||
| pH | 4 | 4 | 0 | ||
| BOD, 5-day, percent removal | 2 | 3 | 0 | ||
| Hardness, total [as CaCO3] | 4 | 2 | 0 | ||
| Oxygen, dissolved [DO] | 2 | 2 | 0 | ||
| Solids, suspended percent removal | 2 | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| February 28, 2019 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| March 13, 2017 | Effluent Violations - Numeric effluent violation | 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.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, SC0042501.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
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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 SC0042501 there.
Nearby on the register
- Discharge permits in Hilton Head Island
- Every permit record in Hilton Head Island, 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.