South Carolina wastewater permits expiring in 2026
16 NPDES permits · 19 MGD combined average flow
16 publicly owned wastewater treatment plants in South Carolina hold NPDES permits that expire during 2026, issued by South Carolina Department of Environmental Services. The table lists each plant with its permit number, expiry month, average flow, treatment technology and three-year violation count, in order of expiry.
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.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires | Technology | Violations (3y) |
|---|---|---|---|---|---|---|
| Saluda Town Of | Saluda | 0.26 | SC0022381 | Jan 2026 | Clarifiers, Aerated lagoons, Carrousels / oxidation ditches | 147 |
| Blacksburg Canoe Creek (new) | Blacksburg | 0.13 | SC0047457 | Jan 2026 | Aerated lagoons | 0 |
| Sumter Pocataligo River WWTP | Sumter | 9.15 | SC0027707 | Mar 2026 | Clarifiers, Aerated lagoons, Uncovered lagoons, Biogas silos | 49 |
| Pendleton-Clemson Reg WWTF | Pendleton | — | SC0035700 | Mar 2026 | Clarifiers, Aerated lagoons | 44 |
| Gsw And Sa Loris Waste Water Treatment Facility | Loris | 0.36 | SC0025348 | Apr 2026 | Aerated lagoons, Uncovered lagoons | 0 |
| York Fishing Creek WWTF | York | 0.65 | SC0038156 | Jun 2026 | Clarifiers, Aerated lagoons, Biogas silos | 13 |
| Florence City Of Timmonsville WWTP | Timmonsville | 0.51 | SC0025356 | Jun 2026 | Aerated lagoons, Uncovered lagoons | 50 |
| Chester Lando-Manetta Plant | Chester | 0.25 | SC0001741 | Jul 2026 | — | 7 |
| Walterboro City Of WWTP | Walterboro | 1.89 | SC0040436 | Sep 2026 | Aerated lagoons, Uncovered lagoons | 35 |
| Batesburg-Leesville Waste Water Treatment Facility | Batesburg | 0.87 | SC0024465 | Sep 2026 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 2 |
| Dorchester Co Upper Dorchester Co WWTP | Saint George | 0.23 | SC0025844 | Sep 2026 | Clarifiers, Aerated lagoons, Uncovered lagoons | 0 |
| N Myrtle Beach Ocean Drive | North Myrtle Beach | 1.87 | SC0022152 | Oct 2026 | Aerated lagoons | 0 |
| Cresent Beach WWTP | North Myrtle Beach | 0.95 | SC0022161 | Oct 2026 | Aerated lagoons | 0 |
| Murrells Inlet Wastewater Treatment Plant | Murrells Inlet | 1.12 | SC0040959 | Nov 2026 | Clarifiers, Carrousels / oxidation ditches | 2 |
| Richland Co Eastover Reg WWTP | Eastover | 0.38 | SC0047911 | Nov 2026 | Clarifiers, Carrousels / oxidation ditches | 6 |
| Isle Of Palms Forest Trail Sd | Isle Of Palms | 0.01 | SC0025283 | Nov 2026 | — | 2 |
South Carolina permit renewals in 2026: 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.