NPDES SC0025950 · Clean Water Act
LRWS YEMASSEE WWTP, Yemassee, SC: NPDES SC0025950 discharge permit, effluent exceedances, inspections, penalties
LRWS YEMASSEE WWTP, Yemassee, South Carolina: Individual permit SC0025950, held by Lowcountry Regional Water System/Yemassee WWTP; Publicly owned treatment works; Effective; issued March 7, 2016, term to March 31, 2021; discharges to COMBAHEE RV; Sewage Treatment Facilities.
- Nitrogen, ammonia total [as N]: 4 limits, 99 violations of any kind, 95 effluent exceedances, latest July 31, 2026, largest 164% over the limit.
- Oxygen demand, ultimate: 4 limits, 34 violations of any kind, 34 effluent exceedances, latest July 31, 2026, largest 215% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 4 limits, 18 violations of any kind, 18 effluent exceedances, latest July 31, 2026, largest 68% over the limit.
- Carbonaceous oxygen demand, % removal: 1 limit, 11 violations of any kind, 10 effluent exceedances, latest January 31, 2025, largest 567% over the limit.
- %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 10 violations of any kind, 6 effluent exceedances, latest March 31, 2025, largest 300% over the limit.
- Solids, suspended percent removal: 1 limit, 6 violations of any kind, 6 effluent exceedances, latest April 30, 2024, largest 157% over the limit.
- Solids, total suspended: 4 limits, 5 violations of any kind, 5 effluent exceedances, latest August 31, 2022, largest 42% over the limit.
- BOD, 5-day, percent removal: 1 limit, 5 violations of any kind, 5 effluent exceedances, latest February 28, 2015, largest 80% over the limit.
- E. coli: 4 limits, 16 violations of any kind, 4 effluent exceedances, latest March 31, 2026, largest 181% over the limit.
- Oxygen, dissolved [DO]: 1 limit, 4 violations of any kind, 4 effluent exceedances, latest September 30, 2004, largest 18% over the limit.
- BOD, 5-day, 20 deg. C: 4 limits, 7 violations of any kind, 3 effluent exceedances, latest April 30, 2014, largest 11% over the limit.
- Coliform, fecal general: 0 limits, 3 violations of any kind, 3 effluent exceedances, latest June 30, 2015, largest 650% over the limit.
- pH: 2 limits, 3 violations of any kind, 2 effluent exceedances, latest April 30, 2017.
- Chlorine, total residual: 4 limits, 2 violations of any kind, 2 effluent exceedances, latest May 31, 2017, largest 727% over the limit.
- Flow, in conduit or thru treatment plant: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest March 31, 2005, largest 25% over the limit.
- Mercury, total [as Hg]: 4 limits, 16 violations of any kind.
- Nitrogen, nitrate total [as N]: 4 limits, 4 violations of any kind.
- Phosphorus, total [as P]: 4 limits, 4 violations of any kind.
- %Mortality 7Day Chronic Ceriodaphnia dubia: 0 limits, 2 violations of any kind.
- %Repro Reduc Static Renewal7D Chronic Ceriodaphnia dubia: 0 limits, 2 violations of any kind.
- May 29, 2026: Letter of Violation/ Warning Letter (State).
- October 16, 2018: Management Practice Violations - Improper Operation and Maintenance (ST6).
South Carolina holds 156 Publicly owned treatment works coverages of this permit type in EPA’s file; 51 were issued before SC0025950.
Coverages issued nearest SC0025950
- 2015-02-03: KINGSTREE SOUTH KINGSTREE IND WWF, Kingstree: SC0049255, held by TOWN OF KINGSTREE
- 2015-02-11: SUMTER POCOTALIGO RIVER PLANT, Sumter: SC0027707, held by SUMTER CITY OF
- 2015-06-22: DUE WEST WWTF, Due West: SC0022403, held by DUE WEST TOWN OF
- 2015-08-17: ORANGEBURG WWTF, Orangeburg: SC0024481, held by ORANGEBURG CITY OF
- 2016-01-25: DORCHESTER CO UPPER DORCHESTER CO WWTP, St. George: SC0025844, held by DORCHESTER COUNTY WATER AND SEWER DEPARTMENT
- 2016-04-11: BENNETTSVILLE WWTF, Bennettsville: SC0025178, held by BENNETTSVILLE CITY OF
- 2016-06-08: TOWN OF HARLEYVILLE, Harleyville: SC0038504, held by HARLEYVILLE TOWN OF
- 2016-07-20: EASLEY GEORGES CREEK LAGOON, Easley: SC0023043, held by EASLEY COMBINED UTILITIES
- 2016-08-26: SOUTH ISLAND PSD RO WTP, Hilton Head Island: SC0047724, held by SOUTH ISLAND PUBLIC SERVICE DISTRICT
- 2016-09-12: GREAT FALLS W C CHILDERS WWTP, Great Falls: SC0021211, held by GREAT FALLS TOWN OF
LRWS YEMASSEE WWTP among its neighbors
5 discharge permits are in the Middle Combahee River subwatershed (HUC 030502070704); SC0025950 is one. Its county: 456, 3 major; SC0025950 is minor permit.
Other permits in the Middle Combahee River subwatershed (HUC 030502070704)
- IRONLINE METALS, Town Of Yemassee: SCR10ZCU1, minor, term to 2028-04-24
- REDDY ICE - YEMASSEE (468), Yemassee: SCRNE1161, minor, term to 2030-12-14
- WEE BEE ENTERPRISES, Yemassee: SCRNE0932, minor, term to 2027-05-10
- YEMASSEE WATER & SEWER SYSTEM IMPROVEMENTS, Yemassee: SCR10ZER1, minor, term to 2026-12-28
Identity
| Facility | LRWS YEMASSEE WWTP |
|---|---|
| Permittee | Lowcountry Regional Water System/Yemassee WWTP |
| NPDES ID | SC0025950 |
| Status | Effective |
| Type | Individual permit |
| Class | Minor |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | March 7, 2016 |
| Expires | March 31, 2021 |
| Address | Yemassee, SC 29945 |
| Receiving water | COMBAHEE RV |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Middle Combahee River (HUC 030502070704) |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
NPDES SC0025950: effluent limits and exceedances
LRWS YEMASSEE WWTP (NPDES SC0025950): 20 pollutants on file, 17 limited; 20 with a violation of any kind, 15 with an exceedance.
| Pollutant | Limits | Violations | Exceedances | Latest | Largest, as filed |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 4 | 99 | 95 | July 31, 2026 | 164% over the limit |
| Oxygen demand, ultimate | 4 | 34 | 34 | July 31, 2026 | 215% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 18 | 18 | July 31, 2026 | 68% over the limit |
| Carbonaceous oxygen demand, % removal | 1 | 11 | 10 | January 31, 2025 | 567% over the limit |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 10 | 6 | March 31, 2025 | 300% over the limit |
| Solids, suspended percent removal | 1 | 6 | 6 | April 30, 2024 | 157% over the limit |
| Solids, total suspended | 4 | 5 | 5 | August 31, 2022 | 42% over the limit |
| BOD, 5-day, percent removal | 1 | 5 | 5 | February 28, 2015 | 80% over the limit |
| E. coli | 4 | 16 | 4 | March 31, 2026 | 181% over the limit |
| Oxygen, dissolved [DO] | 1 | 4 | 4 | September 30, 2004 | 18% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 7 | 3 | April 30, 2014 | 11% over the limit |
| Coliform, fecal general | 0 | 3 | 3 | June 30, 2015 | 650% over the limit |
| pH | 2 | 3 | 2 | April 30, 2017 | |
| Chlorine, total residual | 4 | 2 | 2 | May 31, 2017 | 727% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 1 | 1 | March 31, 2005 | 25% over the limit |
| Mercury, total [as Hg] | 4 | 16 | 0 | ||
| Nitrogen, nitrate total [as N] | 4 | 4 | 0 | ||
| Phosphorus, total [as P] | 4 | 4 | 0 | ||
| %Mortality 7Day Chronic Ceriodaphnia dubia | 0 | 2 | 0 | ||
| %Repro Reduc Static Renewal7D Chronic Ceriodaphnia dubia | 0 | 2 | 0 |
NPDES SC0025950: inspections, violations and enforcement
NPDES SC0025950: 1 single-event violation
| Date | What EPA recorded | Agency |
|---|---|---|
| October 16, 2018 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
NPDES SC0025950: 1 informal enforcement action
| Date | What EPA recorded | Agency |
|---|---|---|
| May 29, 2026 | Letter of Violation/ Warning Letter | State |
NPDES SC0025950 (LRWS YEMASSEE WWTP): no inspection and formal enforcement action on file.
Watch NPDES SC0025950
NPDES SC0025950: one email when its EPA record changes — $99/month.
Permits near NPDES SC0025950
NPDES SC0025950: 20 pollutant rows, 2 dated events; ICIS-NPDES download, loaded October 14, 2026.