| JACKSON TOWN OF (0210002) | JACKSON, SC | 3,660 | 114 | Clean |
| WALLACE WATER COMPANY (SC3420002) | WALLACE, SC | 3,552 | 34 | — |
| FRIPP ISLAND PSD (SC0720002) | FRIPP ISLAND, SC | 3,536 | 8 | Detected |
| CLARENDON CO W&S HWY 260 (SC1450013) | MANNING, SC | 3,521 | 5 | — |
| DENMARK TOWN OF (SC0510002) | DENMARK, SC | 3,500 | 41 | Clean |
| MIDCOUNTY WATER DIST 2 (SC2020004) | WINNSBORO, SC | 3,500 | 4 | Detected |
| CENTRAL TOWN OF (SC3910005) | CENTRAL, SC | 3,495 | 16 | Detected |
| BROAD CREEK PSD (0720009) | HILTON HEAD ISLAND, SC | 3,481 | 6 | Detected |
| PAGELAND CITY OF (SC1310003) | PAGELAND, SC | 3,467 | 56 | — |
| HAMPTON TOWN OF (2510001) | HAMPTON, SC | 3,467 | 2 | — |
| ANDREWS TOWN OF (SC2210003) | ANDREWS, SC | 3,450 | 52 | Detected |
| LORIS CITY OF (SC2610010) | LORIS, SC | 3,428 | 18 | Clean |
| SALUDA CPW (SC4110001) | SALUDA, SC | 3,390 | 83 | Detected |
| LIBERTY CITY OF (SC3910003) | LIBERTY, SC | 3,349 | 38 | Clean |
| EASLEY CENTRAL W/D #1 (SC3920001) | NORRIS, SC | 3,283 | 19 | — |
| OSWEGO RURAL WATER CO (SC4320006) | SUMTER, SC | 3,282 | 6 | — |
| MARIETTA W/D (2320004) | MARIETTA, SC | 3,255 | 24 | — |
| WILLISTON TOWN OF (SC0610002) | WILLISTON, SC | 3,251 | 12 | — |
| EASLEY CENTRAL W/D #2 (SC3920007) | NORRIS, SC | 3,234 | 4 | — |
| HEMINGWAY TOWN OF (SC4510004) | HEMINGWAY, SC | 3,191 | 77 | Detected |
| WARE SHOALS TOWN OF (SC2410003) | WARE SHOALS, SC | 3,174 | 1 | Detected |
| GCWSD CARVERS BAY (SC2220013) | PAWLEYS ISLAND, SC | 3,133 | 59 | — |
| BETHUNE RURAL WATER (SC2820006) | BETHUNE, SC | 3,100 | 20 | — |
| SANTUCK HEBRON WATER CO (4420007) | CARLISLE, SC | 3,097 | 34 | — |
| NINETY SIX CPW (SC2410002) | NINETY SIX, SC | 2,880 | 9 | — |
| BROWNS CREEK W/D (SC4420002) | UNION, SC | 2,790 | 29 | — |
| ALLENDALE INDUSTRIAL PARK (SC0320002) | ALLENDALE, SC | 2,694 | 44 | — |
| RIDGELAND TOWN OF (2710001) | RIDGELAND, SC | 2,678 | 12 | — |
| SILVER SPRINGS W/D (SC3820002) | NEESES, SC | 2,660 | 42 | — |
| ST MATTHEWS TOWN OF (SC0910001) | ST MATTHEWS, SC | 2,644 | 65 | — |
| KERSHAW TOWN OF (SC2910003) | KERSHAW, SC | 2,567 | 36 | — |
| BELTON-HONEA PATH WA (SC0410011) | HONEA PATH, SC | 2,555 | 17 | — |
| JENKINSVILLE WATER COMPANY (SC2020001) | JENKINSVILLE, SC | 2,550 | 154 | — |
| BROWNS FERRY WATER CO (SC2220003) | GEORGETOWN, SC | 2,550 | 51 | — |
| SULLIVANS ISLAND TOWN OF (1010003) | SULLIVANS ISLAND, SC | 2,521 | 9 | — |
| CALHOUN FALLS TOWN OF (SC0110002) | CALHOUN FALLS, SC | 2,473 | 61 | — |
| ROCKY CREEK W/D (SC4420003) | JONESVILLE, SC | 2,464 | 31 | — |
| MCCOLL TOWN OF (SC3410003) | MCCOLL, SC | 2,445 | 53 | — |
| SANTEE TOWN OF (3810011) | SANTEE, SC | 2,388 | 9 | — |
| BULL SWAMP RURAL WTR CO (SC3820001) | ORANGEBURG, SC | 2,350 | 28 | — |
| WATER OAK UTILITY CO (SC0750002) | HILTON HEAD, SC | 2,318 | 28 | — |
| ST GEORGE TOWN OF (1810001) | ST GEORGE, SC | 2,300 | 18 | — |
| COWARD TOWN OF (SC2110012) | COWARD, SC | 2,283 | 4 | — |
| WHITMIRE TOWN OF (3610004) | WHITMIRE, SC | 2,256 | 36 | — |
| YEMASSEE TOWN OF (SC2510006) | HAMPTON, SC | 2,202 | 33 | — |
| HOPKINS COMMUNITY WATER SYSTEM (4020002) | IRMO, SC | 2,200 | 0 | — |
| RIVERVIEW RURAL CWS (SC4620001) | FORT MILL, SC | 2,200 | 27 | — |
| ESTILL TOWN OF (SC2510002) | ESTILL, SC | 2,120 | 45 | — |
| SUMMERTON TOWN OF (SC1410003) | SUMMERTON, SC | 2,096 | 9 | — |
| LATTA TOWN OF (SC1710002) | LATTA, SC | 2,076 | 6 | — |