The 50 largest wastewater treatment plants in South Carolina
Ranked by average flow · 250 MGD combined · 94% of the state's reported flow
Metro Wastewater Treatment Plant in Columbia is the largest publicly owned wastewater treatment plant in South Carolina by reported average flow, treating about 29.87 million gallons per day. The 50 plants below treat 250 MGD between them, 94% of the flow reported by all 122 plants in the state, and serve about 1,423,108 people. Every plant links to its profile with permit, technology and compliance data.
| # | Facility | City | Avg flow (MGD) | Population | NPDES permit | Expires | Technology | Violations (3y) |
|---|---|---|---|---|---|---|---|---|
| 1 | Metro Wastewater Treatment Plant | Columbia | 29.87 | 314,797 | SC0020940 | May 2023 | Clarifiers, Uncovered lagoons, Biogas silos | 7 |
| 2 | Plum Island WWTP | Charleston | 27 | 232,756 | SC0021229 | Jul 2024 | Clarifiers, Biogas balloons | 3 |
| 3 | North Charleston Sewer District WWTP Herbert Site | North Charleston | 15.89 | — | SC0024783 | Aug 2024 | Clarifiers | 2 |
| 4 | Gsw&sa Schwartz Myrtle Beach & Bucksport Reg Wwtps | Conway | 14.9 | 40,000 | SC0037753 | Jul 2030 | Clarifiers, Carrousels / oxidation ditches | 9 |
| 5 | Wcrsa Mauldin Road Wastewater Treatment Plant | Greenville | 12.8 | 243,177 | SC0041211 | Jun 2008 | Clarifiers, Uncovered lagoons, Biogas silos | 24 |
| 6 | City Of Florence Pee Dee River WWTP | Florence | 10.19 | 66,408 | SC0045462 | May 2031 | Clarifiers | 5 |
| 7 | A. Manning Lynch Wastewater Treatment Facility | Spartanburg | 9.82 | — | SCG570017 | Dec 2030 | Clarifiers, Aerated lagoons, Uncovered lagoons, Biogas silos | 2 |
| 8 | Sumter Pocataligo River WWTP | Sumter | 9.15 | — | SC0027707 | Mar 2026 | Clarifiers, Aerated lagoons, Uncovered lagoons, Biogas silos | 49 |
| 9 | Lower Berkeley Wastewater Treatment Plant | Goose Creek | 8.6 | 91,458 | SC0046060 | Apr 2024 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 1 |
| 10 | East Rich Co Psd Gills Creek | Columbia | 8.28 | 80,796 | SC0038865 | May 2023 | Clarifiers | 2 |
| 11 | Pelham WWTP | Greer | 8.2 | 90,116 | SC0033804 | Dec 2023 | Clarifiers, Carrousels / oxidation ditches, Biogas silos | 1 |
| 12 | Rifle Range Wastewater Treatment Facility | Mount Pleasant | 7.3 | 29,054 | SC0040771 | Apr 2030 | Clarifiers, Carrousels / oxidation ditches | 0 |
| 13 | Bjw&sa Cherry Point WWTP | Ridgeland | 7.12 | — | SC0047279 | Oct 2029 | Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches | 1 |
| 14 | Dorchester Co Lower Dorchester WWTP | Dorchester | 6.7 | — | SC0038822 | Nov 2027 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches, Biogas silos | 20 |
| 15 | City Of Georgetown Sewage Treatment Facility | Georgetown | 4.98 | — | SC0040029 | Mar 2024 | Aerated lagoons, Uncovered lagoons, Biogas silos | 0 |
| 16 | Summerville WWTF | Summerville | 4.8 | — | SC0037541 | Nov 2024 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 7 |
| 17 | Wcrsa Gilder Creek | Mauldin | 4.8 | 43,179 | SC0040525 | Dec 2023 | Clarifiers, Biogas silos | 1 |
| 18 | Gsw&sa/george R Vereen WWTP | Conway | 4.75 | 21,032 | SC0041696 | Nov 2027 | Clarifiers, Aerated lagoons, Carrousels / oxidation ditches | 31 |
| 19 | Bjw&sa Port Royal Water Recl Fac | Port Royal | 4.44 | 30,990 | SC0048348 | Jan 2029 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches, Biogas silos | 0 |
| 20 | Orangeburg WWTF | Orangeburg | 3.8 | — | SC0024481 | Sep 2020 | Clarifiers, Carrousels / oxidation ditches | 0 |
| 21 | Generostee Creek Wastewater Treatment Plant | Anderson | 3.25 | — | SC0023752 | Mar 2024 | Clarifiers, Aerated lagoons, Biogas silos | 1 |
| 22 | Maple Creek Wastewater Treatment Plant | Greer | 2.9 | — | SC0046345 | Jul 2024 | Aerated lagoons, Uncovered lagoons | 2 |
| 23 | Hilton Head No 1 Psd Wastewater Treatment Plant | Hilton Head Island | 2.88 | — | SC0046191 | Dec 2025 | Clarifiers, Aerated lagoons, Uncovered lagoons | 17 |
| 24 | Gsw&sa/conway WWTP | Conway | 2.87 | 2,546 | SC0021733 | Mar 2028 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 29 |
| 25 | Bcw&sa Central Berkeley WWTP | Goose Creek | 2.78 | 3,320 | SC0039764 | Apr 2030 | Clarifiers, Aerated lagoons, Carrousels / oxidation ditches | 4 |
| 26 | Newberry Bush River WWTF | Newberry | 1.95 | — | SC0024490 | May 2027 | Clarifiers, Carrousels / oxidation ditches | 2 |
| 27 | Walterboro City Of WWTP | Walterboro | 1.89 | — | SC0040436 | Sep 2026 | Aerated lagoons, Uncovered lagoons | 35 |
| 28 | N Myrtle Beach Ocean Drive | North Myrtle Beach | 1.87 | — | SC0022152 | Oct 2026 | Aerated lagoons | 0 |
| 29 | Wcrsa Durbin Creek | Fountain Inn | 1.7 | 27,487 | SC0040002 | Dec 2023 | — | 2 |
| 30 | Camden WWTF | Camden | 1.67 | — | SC0021032 | Jun 2031 | Clarifiers, Uncovered lagoons | 26 |
| 31 | Rewa Piedmont Regional WWTP | Piedmont | 1.5 | — | SC0048470 | Aug 2027 | — | 0 |
| 32 | Cheraw Wastewater Treatment Plant | Cheraw | 1.49 | — | SC0020249 | Dec 2016 | Clarifiers, Aerated lagoons | 2 |
| 33 | Dillon Little Pee Dee | Dillon | 1.46 | 44,272 | SC0021776 | Aug 2028 | Clarifiers, Aerated lagoons, Carrousels / oxidation ditches | 5 |
| 34 | Little River Wastewater Treatment Plant | Laurens | 1.43 | — | SC0020702 | Apr 2030 | Clarifiers, Uncovered lagoons, Biogas silos | 0 |
| 35 | Lyman Town Of Waste Water Treatment Plant | Lyman | 1.42 | — | SC0021300 | Jan 2029 | Uncovered lagoons | 0 |
| 36 | Renewable Water Resources/geor | Greenville | 1.4 | 48,000 | SC0047309 | Aug 2027 | — | 5 |
| 37 | City Of Bennettsville Wastewater Treatment Plant | Bennettsville | 1.27 | 7,905 | SC0025178 | Feb 2028 | Clarifiers, Aerated lagoons | 6 |
| 38 | Kingstree Wastewater Treatment Plant | Kingstree | 1.24 | — | SC0035971 | Apr 2030 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 5 |
| 39 | Gaffney Clary WWTF | Gaffney | 1.2 | — | SC0031551 | May 2020 | Uncovered lagoons | 0 |
| 40 | Murrells Inlet Wastewater Treatment Plant | Murrells Inlet | 1.12 | — | SC0040959 | Nov 2026 | Clarifiers, Carrousels / oxidation ditches | 2 |
| 41 | Marion/s Main St WWTF | Marion | 1.06 | — | SC0046230 | May 2024 | Clarifiers, Carrousels / oxidation ditches | 0 |
| 42 | Hartsville WWTF | Hartsville | 1.03 | — | SC0021580 | Jun 2027 | Clarifiers, Aerated lagoons, Uncovered lagoons | 8 |
| 43 | Johnsonville WWTP East | Johnsonville | 0.97 | — | SC0025933 | Nov 2022 | Clarifiers, Aerated lagoons | 0 |
| 44 | Chapin Sewage System | Chapin | 0.97 | — | SC0040631 | Jun 2023 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 2 |
| 45 | Cresent Beach WWTP | North Myrtle Beach | 0.95 | — | SC0022161 | Oct 2026 | Aerated lagoons | 0 |
| 46 | Gaffney Broad Rvr | Gaffney | 0.95 | — | SC0047091 | May 2020 | Clarifiers | 0 |
| 47 | Moncks Corner WWTF | Moncks Corner | 0.95 | — | SC0021598 | Dec 2025 | Clarifiers, Carrousels / oxidation ditches | 25 |
| 48 | Clemson Cochran Rd WWTP | Clemson | 0.93 | 5,815 | SC0020010 | May 2029 | Uncovered lagoons | 2 |
| 49 | Batesburg-Leesville Waste Water Treatment Facility | Batesburg | 0.87 | — | SC0024465 | Sep 2026 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 2 |
| 50 | Dairy Street Wastewater Treatment Plant | Ware Shoals | 0.84 | — | SC0020214 | Sep 2027 | Clarifiers, Uncovered lagoons | 2 |
Largest plants 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.