NPDES permits in South Carolina
122 permits held by publicly owned wastewater treatment plants · issued by SCDES
Effective
57
Administratively continued
62
Expired
2
Total tracked
122
South Carolina Department of Environmental Services (SCDES) runs the NPDES program in South Carolina under delegation from EPA Region 4, issuing and enforcing the discharge permits listed here. Klarifi tracks 122 permits held by publicly owned treatment plants in the state, with status, expiry, design flow and three-year compliance for each. Agency website →
An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.
Permit renewals by year
Largest permit holders in South Carolina
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Metro Wastewater Treatment Plant | Columbia | 29.87 | 60 | SC0020940 | Administratively continued | May 2023 | 7 |
| Gsw&sa Schwartz Myrtle Beach & Bucksport Reg Wwtps | Conway | 14.9 | 41.75 | SC0037753 | Effective | Jul 2030 | 9 |
| Plum Island WWTP | Charleston | 27 | 36 | SC0021229 | Administratively continued | Jul 2024 | 3 |
| North Charleston Sewer District WWTP Herbert Site | North Charleston | 15.89 | 32 | SC0024783 | Administratively continued | Aug 2024 | 2 |
| Wcrsa Mauldin Road Wastewater Treatment Plant | Greenville | 12.8 | 29 | SC0041211 | Administratively continued | Jun 2008 | 24 |
| Lower Berkeley Wastewater Treatment Plant | Goose Creek | 8.6 | 22.5 | SC0046060 | Administratively continued | Apr 2024 | 1 |
| Pelham WWTP | Greer | 8.2 | 22.5 | SC0033804 | Administratively continued | Dec 2023 | 1 |
| Rifle Range Wastewater Treatment Facility | Mount Pleasant | 7.3 | 14.3 | SC0040771 | Effective | Apr 2030 | 0 |
| City Of Georgetown Sewage Treatment Facility | Georgetown | 4.98 | 12 | SC0040029 | Administratively continued | Mar 2024 | 0 |
| Wcrsa Gilder Creek | Mauldin | 4.8 | 11.3 | SC0040525 | Administratively continued | Dec 2023 | 1 |
| City Of Florence Pee Dee River WWTP | Florence | 10.19 | — | SC0045462 | Effective | May 2031 | 5 |
| Dorchester Co Lower Dorchester WWTP | Dorchester | 6.7 | 10 | SC0038822 | Effective | Nov 2027 | 20 |
| Generostee Creek Wastewater Treatment Plant | Anderson | 3.25 | 10 | SC0023752 | Administratively continued | Mar 2024 | 1 |
| Marion/s Main St WWTF | Marion | 1.06 | 10 | SC0046230 | Administratively continued | May 2024 | 0 |
| A. Manning Lynch Wastewater Treatment Facility | Spartanburg | 9.82 | — | SCG570017 | Effective | Dec 2030 | 2 |
| Sumter Pocataligo River WWTP | Sumter | 9.15 | — | SC0027707 | Administratively continued | Mar 2026 | 49 |
| Orangeburg WWTF | Orangeburg | 3.8 | 9 | SC0024481 | Administratively continued | Sep 2020 | 0 |
| East Rich Co Psd Gills Creek | Columbia | 8.28 | — | SC0038865 | Effective | May 2023 | 2 |
| Bjw&sa Cherry Point WWTP | Ridgeland | 7.12 | 7.5 | SC0047279 | Effective | Oct 2029 | 1 |
| Bjw&sa Port Royal Water Recl Fac | Port Royal | 4.44 | 7.5 | SC0048348 | Effective | Jan 2029 | 0 |
| Gsw&sa/george R Vereen WWTP | Conway | 4.75 | 7 | SC0041696 | Effective | Nov 2027 | 31 |
| Hilton Head No 1 Psd Wastewater Treatment Plant | Hilton Head Island | 2.88 | 6.4 | SC0046191 | Administratively continued | Dec 2025 | 17 |
| Bcw&sa Central Berkeley WWTP | Goose Creek | 2.78 | 6 | SC0039764 | Effective | Apr 2030 | 4 |
| Dillon Little Pee Dee | Dillon | 1.46 | 5 | SC0021776 | Effective | Aug 2028 | 5 |
| Gaffney Clary WWTF | Gaffney | 1.2 | 5 | SC0031551 | Administratively continued | May 2020 | 0 |
All 122 plants in South Carolina →
NPDES permits in South Carolina: questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026.