TTHM (Total Trihalomethanes) violations in Indiana
94 active public water systems in Indiana had a TTHM (Total Trihalomethanes) violation in the past three years, 6 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 |
|---|---|---|---|---|
|
Troy Water Utility Troy · Perry County |
1,223 | 3 | 1 | |
|
Lynnville Water Works Lynnville · Warrick County |
1,200 | 3 | 0 | |
|
Grabill Water Works Grabill · Allen County |
1,163 | 2 | 1 | |
|
Andrews Water Department Andrews · Huntington County |
1,149 | 7 | 2 | |
|
Ogden Dunes Water Ogden Dunes (wickliffe) · Porter County |
1,110 | 3 | 0 | |
|
Patoka Water Company, Inc. Taswell · Crawford County |
1,038 | 4 | 3 | |
|
Montezuma Municipal Utility Montezuma · Parke County |
1,022 | 3 | 0 | |
|
Winslow Water Works Winslow · Pike County |
1,010 | 3 | 1 | |
|
Wolcott Water Works Wolcott · White County |
1,001 | 2 | 0 | |
|
Lsc Communications Book LLC Crawfordsville · Montgomery County |
1,000 | 4 | 0 | |
|
Lyford Water Works Rosedale · Parke County |
1,000 | 5 | 2 | |
|
Swayzee Water Utility Swayzee · Grant County |
975 | 5 | 1 | |
|
Francesville Water Department Francesville · Pulaski County |
969 | 4 | 2 | |
|
Pokagon State Park (park Office) Angola · Steuben County |
952 | 1 | 0 | |
|
Cedar Lake Robins Nest Schererville · Lake County |
950 | 6 | 0 | |
|
Westport Water Company Cougar Road Westport · Decatur County |
933 | 3 | 0 | |
|
English Water Works English · Crawford County |
886 | 3 | 2 | |
|
Oldenburg Water Works Laurel · Franklin County |
880 | 7 | 0 | |
|
Gaston Water Works Gaston · Delaware County |
838 | 1 | 0 | |
|
Van Bibber Lake Conservancy District Roachdale · Putnam County |
830 | 3 | 1 | |
|
Ridgeville Water Department Ridgeville · Randolph County |
825 | 4 | 0 | |
|
Hamlet Water Works Hamlet · Starke County |
801 | 1 | 0 | |
|
Laurel Water Department Laurel · Franklin County |
800 | 7 | 1 | |
|
Kirklin Water Department Kirklin · Clinton County |
788 | 2 | 0 | |
|
Linden Water Department Linden · Montgomery County |
759 | 8 | 1 | |
|
Boswell Water Department Boswell · Benton County |
750 | 4 | 1 | |
|
Windfall Water Department Windfall · Tipton County |
708 | 6 | 2 | |
|
Cuii Water Service Co. Demotte · Jasper County |
654 | 2 | 0 | |
|
Sharpsville Water Utility Sharpsville · Tipton County |
553 | 8 | 2 | |
|
Chalmers Water Works Chalmers · White County |
550 | 3 | 2 | |
|
Lacrosse Water Department Lacrosse · LaPorte County |
540 | 2 | 0 | |
|
Reynolds Water Works Reynolds · White County |
533 | 4 | 2 | |
|
Pleasantview Utilities, Inc. Connersville · Fayette County |
500 | 3 | 0 | |
|
Hamilton Grove New Carlisle · St. Joseph County |
384 | 3 | 0 | |
|
Mount Summit Water Utility Mount Summit · Henry County |
350 | 4 | 0 | |
|
J. B. Water Works, Inc. Laporte · LaPorte County |
307 | 4 | 0 | |
|
Wingate Water Works Wingate · Montgomery County |
299 | 2 | 0 | |
|
Decker Water Works Decker · Knox County |
273 | 2 | 1 | |
|
Hoosier Youth Challenge Academy Knightstown · Rush County |
262 | 2 | 0 | |
|
Grantsburg Rural Water Company Grantsburg · Crawford County |
250 | 6 | 2 | |
|
Maple Lawn Village Peru · Miami County |
250 | 2 | 0 | |
|
Talbert Mfg., Inc. Rensselaer · Jasper County |
150 | 3 | 0 | |
|
Sunflower Valley Water Co, Inc. Sellersburg · Clark County |
75 | 6 | 3 | |
|
Pence Water Works Williamsport · Warren County |
37 | 4 | 2 |
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 Indiana 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.