TTHM (Total Trihalomethanes) violations in Mississippi
501 active public water systems in Mississippi had a TTHM (Total Trihalomethanes) violation in the past three years, 11 of them still unresolved. What TTHM (Total Trihalomethanes) is and why it matters.
Systems with a TTHM (Total Trihalomethanes) violation
Unresolved first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
City of Waynesboro Waynesboro · Wayne County |
4,570 | 5 | 0 | |
|
Carnes Water Association #2 Stone County |
2,025 | 4 | 0 | |
|
Saucier Utilities Harrison County |
1,853 | 4 | 0 | |
|
Union Church Waterworks Assn Jefferson County |
1,456 | 3 | 1 | |
|
MT Olivet Water Association Panola County |
1,082 | 1 | 0 | |
|
Holmes JR College Holmes County |
1,052 | 2 | 1 | |
|
Town of Mount Olive Covington County |
1,032 | 4 | 0 | |
|
Sapa Water System Webster County |
842 | 1 | 0 | |
|
Liberty Hill Water Association Panola County |
763 | 1 | 0 | |
|
Panola-Union W/a Panola County |
668 | 2 | 0 | |
|
Plum Point Community Water Assn Panola County |
148 | 3 | 0 | |
|
City of Jackson Jackson · Hinds County |
189,673 | 2 | 1 | |
|
City of Olive Branch Olive Branch · DeSoto County |
54,025 | 1 | 0 | |
|
City of Hattiesburg Hattiesburg · Forrest County |
43,449 | 2 | 1 | |
|
City of Starkville Starkville · Oktibbeha County |
32,027 | 1 | 0 | |
|
City of Oxford Oxford · Lafayette County |
28,500 | 1 | 0 | |
|
City of Jackson-Maddox Rd. Jackson · Hinds County |
28,098 | 2 | 0 | |
|
City of Pearl Pearl · Rankin County |
27,115 | 3 | 0 | |
|
City of Pascagoula Pascagoula · Jackson County |
22,686 | 4 | 0 | |
|
City of Laurel Laurel · Jones County |
18,100 | 1 | 0 | |
|
City of Canton Canton · Madison County |
16,785 | 2 | 0 | |
|
MS State University Oktibbeha County |
15,000 | 3 | 0 | |
|
Clarksdale Public Utilities Coahoma County |
14,903 | 4 | 1 | |
|
City of Hernando Hernando · DeSoto County |
14,457 | 2 | 0 | |
|
North Lamar Water Association Lamar County |
12,778 | 1 | 0 | |
|
Horn Lake Water Association DeSoto County |
12,735 | 1 | 0 | |
|
Diamondhead Utilities-North Hancock County |
12,577 | 1 | 0 | |
|
City of Moss Point Moss Point · Jackson County |
12,524 | 3 | 0 | |
|
City of Brookhaven Brookhaven · Lincoln County |
12,513 | 4 | 0 | |
|
City of McComb Mccomb · Pike County |
12,041 | 2 | 1 | |
|
Picayune Utilities, City of Picayune · Pearl River County |
11,859 | 1 | 0 | |
|
Pearl River Central W/a Pearl River County |
11,830 | 3 | 0 | |
|
City of Kosciusko Kosciusko · Attala County |
9,646 | 1 | 0 | |
|
City of Petal Petal · Forrest County |
9,509 | 3 | 0 | |
|
City of Indianola Indianola · Sunflower County |
9,464 | 3 | 1 | |
|
City of Pontotoc Pontotoc · Pontotoc County |
9,398 | 5 | 0 | |
|
Lewisburg Water Association DeSoto County |
9,390 | 2 | 0 | |
|
City of Amory Amory · Monroe County |
9,350 | 2 | 1 | |
|
Walls Water Assn Lake Forest DeSoto County |
9,298 | 1 | 0 | |
|
City of Bay ST Louis Bay St Louis · Hancock County |
9,284 | 3 | 0 | |
|
City of New Albany New Albany · Union County |
8,900 | 1 | 0 | |
|
Cmu Lake Caroline Madison County |
8,511 | 2 | 0 | |
|
Town of Aberdeen Monroe County |
7,783 | 3 | 1 | |
|
Lamar Park Water & Sewage Assn Lamar County |
7,714 | 1 | 0 | |
|
Fannin Water Assn-North Rankin County |
7,690 | 1 | 0 | |
|
City of Louisville Louisville · Winston County |
7,545 | 1 | 0 | |
|
City of Batesville Batesville · Panola County |
7,463 | 1 | 0 | |
|
Kiln Utility and Fire District of Hancoc Hancock County |
7,051 | 1 | 0 | |
|
East Lowndes W/a #2-Huckleberry Lowndes County |
7,035 | 1 | 0 | |
|
Farmington Water Association Alcorn County |
6,925 | 1 | 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 Mississippi 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. Retrieved from ECHO on Oct 11, 2026.