Clean Water Act discharge permit · NPDES SC0046841
WILLIAMSTON BIG CREEK WWTP, Williamston, SC: NPDES SC0046841 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 16Pollutants under a numeric limit
- 12Pollutants with an effluent exceedance
WILLIAMSTON BIG CREEK WWTP, held by WILLIAMSTON TOWN OF, holds NPDES permit SC0046841. EPA’s file records it issued August 29, 2022 and expiring September 30, 2027. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | WILLIAMSTON BIG CREEK WWTP |
|---|---|
| Permittee as filed | WILLIAMSTON TOWN OF |
| NPDES ID | SC0046841 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | August 29, 2022 |
| Expiration date | September 30, 2027 |
| Issuing agency | State |
| Address | Williamston, SC 29679 |
| Subwatershed | Big Creek-Saluda River (HUC 030501090306) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 17Pollutants on file
- 16Under a numeric limit
- 14With a violation of any kind
- 12With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 4 | 86 | 70 | March 31, 2023 | 99,999% over the limit |
| Coliform, fecal general | 0 | 49 | 47 | March 31, 2016 | 99,999% over the limit |
| Nitrogen, ammonia total [as N] | 8 | 60 | 40 | August 31, 2022 | 150% over the limit |
| E. coli | 4 | 40 | 32 | August 31, 2025 | 1,821% over the limit |
| pH | 2 | 33 | 25 | February 28, 2023 | |
| Oxygen, dissolved [DO] | 1 | 20 | 17 | March 31, 2023 | 37% over the limit |
| Oxygen demand, ultimate | 2 | 22 | 14 | March 31, 2022 | 99,999% over the limit |
| Solids, suspended percent removal | 1 | 14 | 11 | March 31, 2023 | 80% over the limit |
| Solids, total suspended | 4 | 23 | 7 | February 28, 2026 | 63% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 15 | 7 | June 30, 2011 | 800% over the limit |
| Chlorine, total residual | 2 | 12 | 2 | April 30, 2011 | 40% over the limit |
| BOD, 5-day, percent removal | 1 | 6 | 2 | December 31, 2010 | 20% over the limit |
| Phosphorus, total [as P] | 6 | 21 | 0 | ||
| Nitrogen, total [as N] | 4 | 12 | 0 | ||
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| LC50 Static 48Hr Acute Ceriodaphnia dubia | 1 | 0 | 0 | ||
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | 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
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 21, 2023 | Permit Violations - Violation Specified in Comment | ST6 |
| June 26, 2020 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| September 20, 2017 | Management Practice Violations - Laboratory Not Certified | ST6 |
| September 20, 2017 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| September 20, 2017 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| September 20, 2017 | 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 SC0046841 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 September 15, 2026.