Clean Water Act discharge permit · NPDES SC0025950
LRWS YEMASSEE WWTP, Yemassee, SC: NPDES SC0025950 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 17Pollutants under a numeric limit
- 15Pollutants with an effluent exceedance
LRWS YEMASSEE WWTP, held by Lowcountry Regional Water System/Yemassee WWTP, holds NPDES permit SC0025950, which discharges to Combahee Rv. EPA’s file records it issued March 7, 2016 and expiring March 31, 2021. 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 | LRWS YEMASSEE WWTP |
|---|---|
| Permittee as filed | Lowcountry Regional Water System/Yemassee WWTP |
| NPDES ID | SC0025950 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | March 7, 2016 |
| Expiration date | 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 |
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
- 20Pollutants on file
- 17Under a numeric limit
- 20With a violation of any kind
- 15With 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] | 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 |
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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| October 16, 2018 | 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 SC0025950 there.
Nearby on the register
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- Every permit record in Yemassee, A to Z
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- Every permit record in South Carolina, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.