TTHM (Total Trihalomethanes) violations in South Carolina
18 active public water systems in South Carolina had a TTHM (Total Trihalomethanes) violation in the past three years, 5 of them in the latest quarter of EPA's data. What TTHM (Total Trihalomethanes) is and why it matters.
Systems with a TTHM (Total Trihalomethanes) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Georgetown City of (sc2210001) Georgetown · Georgetown County |
9,092 | 1 | 0 | |
|
McCormick CO W&sa (sc3520002) Mccormick · McCormick County |
8,500 | 1 | 1 | |
|
Central Town of (sc3910005) Central · Pickens County |
3,495 | 2 | 1 | |
|
Lockhart Town of (sc4420010) Lockhart · Union County |
496 | 1 | 0 | |
|
Catawba Indian Nation Cws (sc4650063) Rock Hill · York County |
446 | 2 | 1 | |
|
Myrtle Beach City of Myrtle Beach · Horry County |
49,375 | 2 | 0 | |
|
Bucksport Water Company (sc2620003) Conway · Horry County |
17,123 | 2 | 0 | |
|
Wcwsa (sc4510007) Kingstree · Williamsburg County |
8,636 | 2 | 0 | |
|
Cheraw Town of (sc1310001) Cheraw · Chesterfield County |
6,325 | 1 | 0 | |
|
Kingstree Town of (sc4510002) Kingstree · Williamsburg County |
6,009 | 3 | 1 | |
|
Loris City of (sc2610010) Loris · Horry County |
4,350 | 4 | 2 | |
|
Gcwsd Carvers Bay (sc2220013) Georgetown County |
3,133 | 1 | 0 | |
|
Browns Creek W/d (sc4420002) Union · Union County |
2,790 | 3 | 0 | |
|
Whitmire Town of (sc3610004) Whitmire · Newberry County |
2,415 | 2 | 1 | |
|
Water Oak Utility CO (sc0750002) Hilton Head Island · Beaufort County |
2,318 | 1 | 0 | |
|
Carlisle Town of (4410003) Carlisle · Union County |
555 | 1 | 0 | |
|
Bcwsa Lake Moultrie Estates (0820004) Moncks Corner · Berkeley County |
156 | 1 | 0 | |
|
Dewees Utilities (sc1050011) Charleston County |
55 | 4 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved TTHM (Total Trihalomethanes), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not TTHM (Total Trihalomethanes) alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The South Carolina records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.