| 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 | Clean |
| 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 | Clean |
| 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 | Clean |
| 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 | - |