TTHM (Total Trihalomethanes) violations in North Dakota
16 active public water systems in North Dakota had a TTHM (Total Trihalomethanes) violation in the past three years, 2 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 |
|---|---|---|---|---|
|
Inspire Communities-Springbrook Williams County |
300 | 4 | 2 | |
|
Manning Water Board Manning · Dunn County |
55 | 4 | 3 | |
|
Northwest Rural Water District Williams County |
5,102 | 1 | 0 | |
|
Dakota Magic Casino County |
2,360 | 7 | 0 | |
|
Ellendale City of Ellendale · Dickey County |
1,394 | 1 | 0 | |
|
Hatton City of Hatton · Traill County |
777 | 1 | 0 | |
|
Parshall-Lucky Mound County |
720 | 1 | 0 | |
|
Sawyer City of Sawyer · Ward County |
357 | 1 | 0 | |
|
Prairie View HOA Williams County |
226 | 5 | 1 | |
|
Dunn Center City of Dunn Center · Dunn County |
146 | 4 | 1 | |
|
Maxbass City of Maxbass · Bottineau County |
84 | 1 | 0 | |
|
Solen, City of County |
72 | 5 | 2 | |
|
Souris City of Souris · Bottineau County |
58 | 2 | 1 | |
|
13 Mile Center Williams County |
50 | 3 | 2 | |
|
Fendee Estates Williams County |
30 | 2 | 0 | |
|
The Bluffs HOA Williams County |
30 | 2 | 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 North Dakota 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.