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 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 |
|---|---|---|---|---|
|
City of Philadelphia Philadelphia · Neshoba County |
6,921 | 1 | 0 | |
|
Algoma Water Association Pontotoc County |
6,879 | 3 | 0 | |
|
City of Hernando-Jaybird DeSoto County |
6,750 | 4 | 0 | |
|
Southwest Jones W/a-North Jones County |
6,690 | 1 | 0 | |
|
Combined Utilities George County |
6,658 | 1 | 0 | |
|
Arnold Line Water Association Lamar County |
6,600 | 1 | 0 | |
|
Town of Caledonia Lowndes County |
6,589 | 1 | 0 | |
|
Central W/a-East Side Neshoba County |
6,442 | 1 | 0 | |
|
City of Waveland Waveland · Hancock County |
6,400 | 2 | 0 | |
|
Sebastopol Water Association Scott County |
6,207 | 1 | 0 | |
|
Greenfield Water Association Rankin County |
6,088 | 4 | 0 | |
|
Sunrise Utility Assn INC Forrest County |
6,067 | 1 | 0 | |
|
Nesbit Water Association DeSoto County |
5,988 | 1 | 0 | |
|
City of Columbia Columbia · Marion County |
5,900 | 4 | 0 | |
|
Kossuth W/a #3-Pine Mountain Alcorn County |
5,830 | 3 | 0 | |
|
Town of Florence Rankin County |
5,824 | 2 | 0 | |
|
Pleasant Ridge W/a Jones County |
5,808 | 1 | 0 | |
|
East Lowndes #4-Herman-Vaughn Lowndes County |
5,678 | 1 | 0 | |
|
Marshall CO Water Assn Marshall County |
5,599 | 1 | 0 | |
|
North Pike Water Association Pike County |
5,359 | 1 | 0 | |
|
Topisaw Creek Lincoln County |
5,349 | 1 | 0 | |
|
Central W/a-Southwest Neshoba County |
5,312 | 1 | 0 | |
|
East Leflore Water & Sewer Dst Leflore County |
5,206 | 1 | 0 | |
|
East Pontotoc Water Assn Pontotoc County |
5,170 | 2 | 0 | |
|
City of Winona Winona · Montgomery County |
5,071 | 2 | 0 | |
|
Clayton Village W/a #1-East Oktibbeha County |
4,984 | 1 | 0 | |
|
City of Carthage Carthage · Leake County |
4,901 | 1 | 0 | |
|
Riverbend Utilities INC Harrison County |
4,834 | 2 | 0 | |
|
East Lowndes W/a a East-Old Yorkville Lowndes County |
4,778 | 1 | 0 | |
|
City of Belzoni Belzoni · Humphreys County |
4,768 | 9 | 2 | |
|
City of Leland Leland · Washington County |
4,591 | 4 | 0 | |
|
Clarkdale Water Assn # 1 Lauderdale County |
4,500 | 1 | 0 | |
|
Town of Byhalia Marshall County |
4,446 | 3 | 0 | |
|
Pearl River Central W/a-Henley Field Pearl River County |
4,438 | 1 | 0 | |
|
Pearl River Central W/a-Bi CO Pearl River County |
4,406 | 1 | 0 | |
|
City of Wiggins Wiggins · Stone County |
4,300 | 3 | 0 | |
|
Hamilton Water District Monroe County |
4,029 | 1 | 0 | |
|
Okatoma Water Association #1 Simpson County |
3,981 | 1 | 0 | |
|
Long Creek Water Assn #2 Lauderdale County |
3,977 | 1 | 0 | |
|
MS State Hospital-Whitfield Rankin County |
3,950 | 1 | 0 | |
|
Beat III W/a #1-Sand Hill Greene County |
3,881 | 1 | 0 | |
|
Big V Water Association Prentiss County |
3,878 | 2 | 0 | |
|
J P Utility District Jones County |
3,839 | 1 | 0 | |
|
Leesburg Water Association Rankin County |
3,836 | 1 | 0 | |
|
Sunnyhill Water Association Pike County |
3,833 | 4 | 1 | |
|
Toomsuba Water Association Lauderdale County |
3,828 | 1 | 0 | |
|
City of Houston Houston · Chickasaw County |
3,772 | 2 | 0 | |
|
Old Union Water System Lee County |
3,749 | 5 | 0 | |
|
Calhoun Water Association Jones County |
3,730 | 1 | 0 | |
|
Southwest Covington W/a Covington County |
3,601 | 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.