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 |
|---|---|---|---|---|
|
Magnolia Water Association Stone County |
2,107 | 1 | 0 | |
|
City of Calhoun City Calhoun City · Calhoun County |
2,101 | 2 | 0 | |
|
Lawrence County Water Assn Lawrence County |
2,100 | 1 | 0 | |
|
City of Marks Marks · Quitman County |
2,099 | 2 | 0 | |
|
Rocky Creek Utilities, INC George County |
2,095 | 1 | 0 | |
|
Hotophia Water Association Panola County |
2,086 | 1 | 0 | |
|
Town of Taylorsville Smith County |
2,075 | 2 | 0 | |
|
Town of Smithville Monroe County |
2,062 | 2 | 0 | |
|
NE Itawamba W/a #2-Salem Itawamba County |
2,054 | 1 | 0 | |
|
Siloam W/a #2-Griffith Well Clay County |
2,054 | 3 | 1 | |
|
Independence Water Association Panola County |
2,035 | 2 | 0 | |
|
Golden Triangle Water Assn #1 Clay County |
2,033 | 1 | 0 | |
|
Lincoln Rural W/a-Old Red Star Lincoln County |
2,001 | 1 | 0 | |
|
City of Fayette Jefferson County |
2,000 | 3 | 1 | |
|
Coahoma Community College Coahoma County |
2,000 | 3 | 0 | |
|
City of Nettleton Nettleton · Lee County |
1,995 | 2 | 0 | |
|
Grenada Ind PK & Airport Water Grenada County |
1,991 | 1 | 0 | |
|
Lampton Water Association Marion County |
1,983 | 2 | 0 | |
|
Town of Edwards Hinds County |
1,980 | 2 | 0 | |
|
Town of Ashland Benton County |
1,977 | 1 | 0 | |
|
Southeast Chickasaw W/a #1 Chickasaw County |
1,969 | 1 | 0 | |
|
Runnelstown-North Perry County |
1,968 | 1 | 0 | |
|
Harrisville W/a Simpson County |
1,967 | 1 | 0 | |
|
City of Quitman Quitman · Clarke County |
1,964 | 1 | 0 | |
|
Grenada CO W/s-Mondy Rd/elliot Grenada County |
1,964 | 1 | 0 | |
|
Town of Hatley Monroe County |
1,962 | 1 | 0 | |
|
City of Horn Lake Twin Lakes DeSoto County |
1,948 | 1 | 0 | |
|
Town of Decatur Newton County |
1,945 | 2 | 0 | |
|
Highpoint Water Association #1 Winston County |
1,940 | 1 | 0 | |
|
Central Yazoo #3 Mechanicsbrg Yazoo County |
1,927 | 1 | 0 | |
|
Sun Creek Water Inc-Pheba Clay County |
1,923 | 1 | 0 | |
|
Town of Sunflower Sunflower County |
1,900 | 2 | 0 | |
|
Bcm Water Association Marshall County |
1,898 | 1 | 0 | |
|
Town of Wesson Copiah County |
1,891 | 4 | 0 | |
|
Town of Prentiss Jefferson Davis County |
1,882 | 2 | 0 | |
|
Homewood Water Association Scott County |
1,877 | 2 | 1 | |
|
Acl Water Association #2 Rankin County |
1,861 | 3 | 0 | |
|
Tri-County W/a #1-Jasper Jasper County |
1,861 | 2 | 0 | |
|
Tri-County W/a #3-Summerland Jasper County |
1,853 | 2 | 0 | |
|
Town of Plantersville Lee County |
1,845 | 1 | 0 | |
|
Soso Community Water Sys. INC Jones County |
1,840 | 1 | 0 | |
|
Grenada-Bogue Basin/holcomb Grenada County |
1,837 | 2 | 0 | |
|
Grenada-Bogue Basin/gore Sprgs Grenada County |
1,832 | 3 | 0 | |
|
Long Creek W/a (whynot) Lauderdale County |
1,823 | 2 | 0 | |
|
North Lee W/a #2-Birmingham RD Lee County |
1,822 | 2 | 1 | |
|
Chalybeate Water Assn Tippah County |
1,782 | 1 | 0 | |
|
Westover Water Association, INC Lafayette County |
1,771 | 3 | 0 | |
|
Thorn Water Association Chickasaw County |
1,756 | 1 | 0 | |
|
Town of Marion Lauderdale County |
1,751 | 2 | 0 | |
|
Lebanon W/a-West Holmes County |
1,742 | 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 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.