| Public water system | Population served |
|---|---|
| GREENVILLE WATER (SC2310001) | 426,057 |
| COLUMBIA CITY OF (SC4010001) | 354,068 |
| CHARLESTON WATER SYSTEM (SC1010001) | 327,422 |
| GSW&SA (SC2620004) | 252,840 |
| SPARTANBURG WATER SYSTEM (SC4210001) | 166,364 |
| BJW&SA (SC0720003) | 164,829 |
| BCWSA SANGAREE W/D (0820002) | 95,345 |
| MT PLEASANT WATER WORKS (1010002) | 91,500 |
| ROCK HILL CITY OF (SC4610002) | 89,850 |
| SJWD MIDDLE TYGER WTP (SC4220006) | 89,531 |
| SUMMERVILLE CPW (SC1810003) | 81,750 |
| FLORENCE CITY OF (SC2110001) | 79,745 |
| LANCASTER COUNTY W&SD (SC2920001) | 79,107 |
| GREER CPW (SC2310005) | 54,024 |
| SUMTER CITY OF (SC4310001) | 53,070 |
| DARLINGTON COUNTY W&SA (SC1620001) | 52,288 |
| GREENWOOD CPW (2410001) | 52,022 |
| AIKEN CITY OF (SC0210001) | 51,533 |
| JOINT MUNICIPAL WSC (SC3220003) | 47,838 |
| ORANGEBURG DPU (SC3810001) | 47,463 |
| LAURENS COUNTY W&S COMM (SC3020001) | 44,866 |
| N MYRTLE BEACH CITY OF (SC2610011) | 43,883 |
| GOOSE CREEK CITY OF (SC0810004) | 43,744 |
| GCWSD WACCAMAW NECK (SC2220010) | 41,300 |
| INMAN CAMPOBELLO W/D (4220002) | 41,007 |
| DCWA KNIGHTSVILLE (SC1820001) | 40,141 |
| BLUE RIDGE WATER CO INC (SC2320003) | 40,006 |
| SENECA CITY OF (SC3710002) | 39,772 |
| ELECTRIC CITY UTILITIES (SC0410012) | 38,204 |
| EASLEY COMBINED UTIL (SC3910002) | 36,098 |
| POWDERSVILLE WATER DISTRICT (SC0420002) | 34,960 |
| WEST COLUMBIA CITY OF (SC3210004) | 34,028 |
| WOODRUFF ROEBUCK W/D (SC4220007) | 32,038 |
| FORT JACKSON (SC4010501) | 31,000 |
| YORK COUNTY EAST WD (SC4620002) | 30,225 |
| EDGEFIELD CO W&SA (1920001) | 29,200 |
| CONWAY CITY OF (SC2610008) | 27,005 |
| DCWS ASHLEY PHOSPHATE (SC1820008) | 26,536 |
| NORTH AUGUSTA CITY OF (SC0210003) | 26,125 |
| LUGOFF ELGIN WATER AUTH (SC2820001) | 25,783 |
| CHESTERFIELD CO RURAL WATER (SC1320003) | 25,691 |
| HILTON HEAD PSD 1 (0720006) | 25,558 |
| GAFFNEY BPW (SC1110001) | 24,290 |
| LEXINGTON TOWN OF (3210001) | 24,284 |
| BREEZY HILL W/D (SC0220006) | 21,197 |
| HAMMOND W/D (SC0420007) | 21,193 |
| CAMDEN CITY OF (SC2810001) | 19,076 |
| SOUTH ISLAND PSD (SC0720001) | 18,299 |
| LCF WATER DISTRICT (SC4220010) | 18,152 |
| CLEMSON CITY OF (SC3910004) | 17,896 |
| CAYCE CITY OF (SC3210003) | 17,460 |
| WEST ANDERSON W/D (0420006) | 17,430 |
| SANDY SPRINGS WATER CO INC (SC0420003) | 17,311 |
| MARCO RURAL WATER CO (SC3320001) | 17,120 |
| PIONEER RURAL WATER DIST (SC3720001) | 16,929 |
| WALHALLA CITY OF (SC3710004) | 16,010 |
| SIX MILE W/D (SC3920002) | 14,845 |
| LANCASTER CITY OF (SC2910001) | 14,074 |
| LAURENS CPW (SC3010001) | 13,902 |
| BIG CREEK W/S DISTRICT (0420009) | 13,647 |
| UNION CITY OF (SC4410001) | 13,076 |
| BCWSA EAST COOPER (SC0820009) | 12,933 |
| CONWAY RURAL (SC2620001) | 12,740 |
| WALTERBORO CITY OF (1510004) | 11,829 |
| NEWBERRY CO W&SA (SC3620002) | 11,157 |
| YORK CITY OF (SC4610001) | 11,137 |
| STARR-IVA W/D (SC0420005) | 11,125 |
| OCEAN LAKES LTD (SC2660048) | 10,727 |
| TEGA CAY CITY OF (SC4610008) | 10,500 |
| GILBERT-SUMMIT WD (3220001) | 10,400 |
| WINNSBORO TOWN OF (2010001) | 10,391 |
| PICKENS WTP (SC3910001) | 10,263 |
| SHAW AFB (SC4310501) | 10,000 |
| NEWBERRY CITY OF (3610001) | 9,947 |
| GRASSY POND WATER CO INC (SC1120002) | 9,895 |
| WESTMINSTER CITY OF (SC3710003) | 9,588 |
| BROADWAY W&S DISTRICT (SC0420008) | 9,586 |
| SOUTHSIDE W/D (3920010) | 9,568 |
| KIAWAH ISLAND UTILITY (SC1010008) | 9,550 |
| LAKE CITY CITY OF (SC2110007) | 9,191 |
| BENNETTSVILLE CITY OF (SC3410001) | 9,168 |
| GSW&SA-MARION CITY OF (SC3310001) | 9,104 |
| GEORGETOWN CITY OF (SC2210001) | 9,092 |
| MONCKS CORNER CITY OF (SC0810001) | 8,956 |
| CLINTON CITY OF (SC3010002) | 8,938 |
| BEECH ISLAND W/D (SC0220004) | 8,935 |
| HARTSVILLE CITY OF (SC1610003) | 8,711 |
| DACUSVILLE-CEDAR ROCK WT CO (SC3920008) | 8,700 |
| MCCORMICK CO W&SA (SC3520002) | 8,500 |
| CLOVER TOWN OF (SC4610006) | 8,400 |
| CLEMSON UNIVERSITY (SC3910006) | 8,320 |
| VALLEY PSA (SC0220012) | 7,752 |
| GASTON RURAL WATER DIST (SC3220002) | 7,550 |
| MEANSVILLE RILEY W/D (SC4420001) | 7,368 |
| MULLINS CITY OF (SC3310002) | 7,366 |
| HOMELAND PARK W/D (SC0420001) | 7,328 |
| NEW ELLENTON CPW (SC0210007) | 7,277 |
| DARLINGTON CITY OF (SC1610001) | 7,142 |
| DILLON CITY OF (SC1710001) | 6,998 |
| BATESBURG LEESVILLE DPW (SC3210002) | 6,814 |
| BELTON CITY OF (SC0410004) | 6,762 |
| WILLIAMSTON TOWN OF (SC0410010) | 6,693 |
| SALEM TOWN OF (SC3710001) | 6,444 |
| BETHLEHEM-ROANOKE W/D (SC3920003) | 6,334 |
| CHERAW TOWN OF (SC1310001) | 6,325 |
| KINGSTREE TOWN OF (SC4510002) | 6,009 |
| MANNING CITY OF (SC1410002) | 5,908 |
| EDISTO BEACH TOWN OF (SC1510006) | 5,848 |
| DANIEL MORGAN WATER DISTRICT (1120001) | 5,746 |
| ABBEVILLE CITY OF (SC0110001) | 5,650 |
| PENDLETON TOWN OF (SC0410006) | 5,597 |
| DRAYTONVILLE WATER DIST (SC1120003) | 5,456 |
| GOUCHER WD (1120004) | 5,323 |
| DONALDS-DUE WEST W&SA (SC0120001) | 5,200 |
| SWS-LANDRUM WTP (SC4210003) | 5,143 |
| FOLLY BEACH CITY OF (1010005) | 5,086 |
| JOHNSONVILLE CITY OF (SC2110011) | 5,083 |
| GEORGETOWN RURAL COMM WA (2220001) | 4,941 |
| ALLIGATOR RURAL WATER (SC1320004) | 4,743 |
| BARNWELL TOWN OF (SC0610001) | 4,693 |
| SALUDA CO W&S AUTHORITY (4120001) | 4,535 |
| BLACKSBURG TOWN OF (SC1110002) | 4,496 |
| GCWSD KILSOCK WATER SYS (SC2220002) | 4,417 |
| HONEA PATH TOWN OF (SC0410003) | 4,386 |
| LORIS CITY OF (SC2610010) | 4,350 |
| HIGHWAY 88 W/D (SC0420004) | 3,990 |
| AMICKS FERRY WTR SYSTEM (SC3250077) | 3,937 |
| DALZELL WATER DISTRICT (SC4320001) | 3,912 |
| ALLENDALE TOWN OF (SC0310001) | 3,882 |
| MONTMORENCI W/D (SC0220008) | 3,837 |
| BISHOPVILLE TOWN OF (SC3110001) | 3,810 |
| BAMBERG PUBLIC WORKS (SC0510001) | 3,735 |
| JACKSON TOWN OF (SC0210002) | 3,660 |
| FRIPP ISLAND PSD (SC0720002) | 3,536 |
| CLARENDON CO W&S HWY 260 (SC1450013) | 3,521 |
| DENMARK TOWN OF (SC0510002) | 3,500 |
| CENTRAL TOWN OF (SC3910005) | 3,495 |
| BROAD CREEK PSD (SC0720009) | 3,481 |
| HAMPTON TOWN OF (SC2510001) | 3,467 |
| PAGELAND CITY OF (SC1310003) | 3,467 |
| ANDREWS TOWN OF (SC2210003) | 3,450 |
| SALUDA CPW (SC4110001) | 3,390 |
| LIBERTY CITY OF (SC3910003) | 3,349 |
Largest first by population served, as each employer reports it to its federal registry.
Source: U.S. Environmental Protection Agency, Safe Drinking Water Information System (SDWIS/Fed), community water systems. Data captured October 2, 2026.
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