Tapcensus

Chlorine (MRDL) violations in North Dakota

32 active public water systems in North Dakota had a Chlorine (MRDL) violation in the past three years, 5 of them in the latest quarter of EPA's data. What Chlorine (MRDL) is and why it matters.

Health effects: Acute high-dose exposure to chlorinated water can cause eye and nose irritation, stomach discomfort, and nausea. Chronic exposure above the MRDL is primarily a concern because elevated chlorine accelerates formation of trihalomethanes and haloacetic acids, which are associated with increased cancer risk over time.

Systems with a Chlorine (MRDL) violation

Latest quarter first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
Horace City of
Horace · Cass County 		1,641 4 2
Emerado City of
Emerado · Grand Forks County 		414 3 0
Tolna City of
Tolna · Nelson County 		166 5 2
Hannaford City of
Hannaford · Griggs County 		131 1 0
Coleharbor City of
Coleharbor · McLean County 		79 3 0
East Central Regional Wd-Traill
Hillsboro · Traill County 		2,800 2 0
New Rockford City of
New Rockford · Eddy County 		1,391 1 0
Northwood City of
Northwood · Grand Forks County 		945 3 0
Dunseith City of
Dunseith · Rolette County 		773 3 2
Lakota City of
Lakota · Nelson County 		672 1 0
Towner City of
Towner · McHenry County 		479 4 0
MC Clusky City of
Mcclusky · Sheridan County 		380 1 0
Fairmount City of
Fairmount · Richland County 		367 2 0
Abercrombie City of
Abercrombie · Richland County 		263 4 0
Hope City of
Hope · Steele County 		258 2 0
Sheyenne City of
Sheyenne · Eddy County 		204 3 0
Buffalo City of
Buffalo · Cass County 		188 2 0
Binford City of
Binford · Griggs County 		183 4 2
Streeter City of
Streeter · Stutsman County 		170 1 0
Wing City of
Wing · Burleigh County 		152 3 0
Oberon City of
Oberon · Benson County 		105 7 2
Goodrich City of
Goodrich · Sheridan County 		98 3 1
Mercer City of
Mercer · McLean County 		94 5 2
Rock Lake City of
Rocklake (corporate Name For R · Towner County 		94 2 1
Mountain City of
Mountain · Pembina County 		92 2 0
Cleveland City of
Cleveland · Stutsman County 		83 1 0
Karlsruhe City of
Karlsruhe · McHenry County 		82 3 2
Jud City of
Jud · LaMoure County 		72 3 1
Warwick City of
County 		65 2 0
Nekoma City of
Nekoma · Cavalier County 		50 3 1
Cathay City of
Cathay · Wells County 		43 6 2
Sibley City of
Sibley · Barnes County 		30 2 0
About this data

A system is counted once if any of its violations in the past three years involved Chlorine (MRDL), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Chlorine (MRDL) 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.