| Bgwc Westside Terrace (3250002) | West Columbia | 172 | 0.0690 mg/L |
| Rae Mckenzie Mobile Home Park | Graham | 100 | 0.0550 mg/L |
| Bgwc the Landings (3250063) | West Columbia | 430 | 0.0380 mg/L |
| Fishing Creek Poa (sc1550002) | Edisto Beach | 98 | 0.0340 mg/L |
| Bgwc i-20 (sc3250012) | West Columbia | 7,146 | 0.0230 mg/L |
| Bgwc Lexington Estates (sc3250050) | Lexington | 419 | 0.0210 mg/L |
| Mccords Ferry at Lake Marion (sc3850004) | Santee | 21 | 0.0160 mg/L |
| Salley Town of (sc0210005) | Salley | 456 | 0.0150 mg/L |
| Mathews Heights (sc2450021) | Greenwood | 73 | 0.0150 mg/L |
| 611 Harmon Llc (sc4060012) | Hopkins | 24 | 0.0150 mg/L |
| Bethlehem-Roanoke W/D (sc3920003) | Pickens | 6,334 | 0.0140 mg/L |
| Gsw&Sa-Myrtle Beach (sc2620009) | Myrtle Beach | 25 | 0.0140 mg/L |
| Swansea Town of (sc3210006) | Swansea | 1,923 | 0.0130 mg/L |
| Bgwc Riverbend Estates (sc4660103) | Rock Hill | 93 | 0.0130 mg/L |
| Bay Ridge S/D (sc3750027) | Salem | 62 | 0.0130 mg/L |
| Mcdonalds Mhp (sc4060010) | Hopkins | 16 | 0.0130 mg/L |
| River View Subdivision | — | 58 | 0.0123 mg/L |
| Winnsboro Town of (2010001) | Winnsboro | 10,391 | 0.0120 mg/L |
| Cedar Valley Mhp (sc4660009) | Catawba | 290 | 0.0120 mg/L |
| Palmetto Park (4060006) | Columbia | 132 | 0.0120 mg/L |
| Bgwc Tanglewood S/D (sc4150011) | Leesville | 29 | 0.0120 mg/L |
| Hammond W/D (sc0420007) | Belton | 21,193 | 0.0110 mg/L |
| Bjw&Sa Palm Key (2750031) | Bluffton | 153 | 0.0110 mg/L |
| Country Village Mhp (sc1360008) | Cheraw | 96 | 0.0110 mg/L |
| V P Mobile Home Park | East Bend | 91 | 0.0100 mg/L |
| Bgwc Mallard Cove (sc3250076) | West Columbia | 78 | 0.0100 mg/L |
| Siesta Cove Rv Park Marina (sc3270802) | Gilbert | 40 | 0.0100 mg/L |
| Cedar Hill Mhp (sc4360010) | Sumter | 128 | 0.0080 mg/L |
| Lodge Town of (1510001) | Lodge | 121 | 0.0080 mg/L |
| Bgwc Southbend Estates (sc4660100) | Clover | 111 | 0.0080 mg/L |
| Dewees Utilities (sc1050011) | Dewees Island | 55 | 0.0080 mg/L |
| Bgwc Lessliewoods 2 (sc4650051) | Rock Hill | 41 | 0.0080 mg/L |
| Sand Mountain Mhp (sc3260183) | Gaston | 40 | 0.0080 mg/L |
| Cedarwood Acres Mobile Home Park | — | 133 | 0.0079 mg/L |
| Blackville Town of (sc0610003) | Blackville | 1,934 | 0.0075 mg/L |
| Georgetown City of (sc2210001) | Georgetown | 9,092 | 0.0074 mg/L |
| New Holland W/D (sc0220010) | Batesburg | 301 | 0.0074 mg/L |
| Blue Ridge Water Co Inc (sc2320003) | Greer | 40,006 | 0.0070 mg/L |
| Easley Central W/D #1 (sc3920001) | Easley | 3,283 | 0.0070 mg/L |
| Chickasaw Point (sc3750010) | Westminster | 823 | 0.0070 mg/L |
| Bgwc Olympic Acres (sc4650053) | York | 209 | 0.0070 mg/L |
| Chucks Mhp (sc4660077) | Clover | 168 | 0.0070 mg/L |
| Keowee Bay S/D (sc3750026) | Salem | 115 | 0.0070 mg/L |
| Cameron Mhp (sc0260038) | Aiken | 83 | 0.0070 mg/L |
| Sandy Hill Mhp (sc4060064) | Columbia | 81 | 0.0070 mg/L |
| Pinehaven S/D (sc4650037) | Clover | 81 | 0.0070 mg/L |
| Bgwc Edgebrook (0450004) | Anderson | 48 | 0.0070 mg/L |
| Gcwsd Waccamaw Neck (sc2220010) | Pawleys Island | 41,300 | 0.0069 mg/L |
| Whispering Pines Mhp (sc4360021) | Sumter | 80 | 0.0063 mg/L |
| Mccoll Town of (sc3410003) | Mccoll | 2,445 | 0.0062 mg/L |
| Ehrhardt Town of (sc0510003) | Ehrhardt | 507 | 0.0061 mg/L |
| Bgwc Idlewood (sc3250017) | West Columbia | 134 | 0.0060 mg/L |
| Whitley Estates (4660055) | Fort Mill | 93 | 0.0060 mg/L |
| Bgwc Middlestream (sc4650052) | Catawba | 88 | 0.0060 mg/L |
| Pecan Grove Commons (sc4660003) | Rock Hill | 58 | 0.0060 mg/L |
| Brunson Town of (sc2510004) | Brunson | 649 | 0.0059 mg/L |
| College Acres Public W/D (sc0220002) | Aiken | 1,360 | 0.0058 mg/L |
| Johnsonville City of (sc2110011) | Johnsonville | 5,083 | 0.0056 mg/L |
| North Town of (sc3810010) | North | 1,378 | 0.0053 mg/L |
| Columbia City of (sc4010001) | Columbia | 354,068 | 0.0050 mg/L |
| Lancaster County W&Sd (sc2920001) | Lancaster | 79,107 | 0.0050 mg/L |
| Powdersville Water District (sc0420002) | Easley | 34,960 | 0.0050 mg/L |
| Clemson City of (sc3910004) | Clemson | 17,896 | 0.0050 mg/L |
| Gaston Rural Water Dist (sc3220002) | Gaston | 7,550 | 0.0050 mg/L |
| Central Town of (sc3910005) | Central | 3,495 | 0.0050 mg/L |
| Wild Meadows S/D (sc3250097) | Lexington | 878 | 0.0050 mg/L |
| Eastover Town of (sc4010002) | Eastover | 700 | 0.0050 mg/L |
| Bgwc Parkwood S/D (3250029) | West Columbia | 311 | 0.0050 mg/L |
| Bgwc Creekwood (3250042) | West Columbia | 136 | 0.0050 mg/L |
| River Bluff S/D (sc3950005) | Travelers Rest | 133 | 0.0050 mg/L |
| Bgwc Springfield Acres (sc4050006) | Hopkins | 130 | 0.0050 mg/L |
| Shady Acres (sc3250060) | Chapin | 73 | 0.0050 mg/L |
| Stephenson'S Lake (sc3250018) | Chapin | 55 | 0.0050 mg/L |
| Triple Acres Mhp 1 (sc3260049) | West Columbia | 38 | 0.0050 mg/L |
| Turtlehead at Keowee S/D (sc3750022) | Salem | 32 | 0.0050 mg/L |
| Lieber Correctional Institute (1870050) | Ridgeville | 1,646 | 0.0048 mg/L |
| Dcws Conoflow (sc1820007) | St. George | 150 | 0.0048 mg/L |
| Ridgeland Town of (2710001) | Ridgeland | 2,678 | 0.0046 mg/L |
| Jefferson Town of (sc1310005) | Jefferson | 948 | 0.0046 mg/L |
| Beech Island W/D (sc0220004) | Beech Island | 8,935 | 0.0046 mg/L |
| Wells East S/D (sc0750026) | Hilton Head Island | 60 | 0.0044 mg/L |
| Harbor Island (sc0750013) | Helena | 1,039 | 0.0043 mg/L |
| Lane Town of (4510005) | Lane | 585 | 0.0043 mg/L |
| Quail Hollow S/D (sc4350014) | Sumter | 36 | 0.0041 mg/L |
| Greenwood Cpw (2410001) | Greenwood | 52,022 | 0.0040 mg/L |
| Joint Municipal Wsc (sc3220003) | Lexington | 47,838 | 0.0040 mg/L |
| Lexington Town of (3210001) | Lexington | 24,284 | 0.0040 mg/L |
| Pickens Wtp (sc3910001) | Pickens | 10,263 | 0.0040 mg/L |
| Westminster City of (sc3710003) | Westminster | 9,588 | 0.0040 mg/L |
| Seabrook Island Town of (1010009) | Seabrook | 5,939 | 0.0040 mg/L |
| Jenkinsville Water Company (sc2020001) | Jenkinsville | 2,550 | 0.0040 mg/L |
| Jonesville Town of (sc4410002) | Jonesville | 1,886 | 0.0040 mg/L |
| Bgwc Bellemead S/D (3250031) | Lexington | 367 | 0.0040 mg/L |
| Oakhill S/D (sc0250004) | Aiken | 243 | 0.0040 mg/L |
| Bgwc Brown Borough (sc4650061) | Clover | 193 | 0.0040 mg/L |
| Bgwc Greenforest (sc0450006) | Anderson | 173 | 0.0040 mg/L |
| Hillview Mhp (sc3260104) | Lexington | 96 | 0.0040 mg/L |
| Waterlynn Downs (sc4660045) | York | 92 | 0.0040 mg/L |
| Hideaway Mhp (sc3260127) | Lexington | 35 | 0.0040 mg/L |
| Country Acres (sc2450057) | Greenwood | 34 | 0.0040 mg/L |