Chlorine (MRDL) violations in Alaska
152 active public water systems in Alaska had a Chlorine (MRDL) violation in the past three years, 56 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| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Takotna Water System Takotna · Yukon-Koyukuk Census Area County |
70 | 7 | 1 | |
|
Nelson Lagoon Water System Nelson Lagoon · Aleutians East Borough County |
60 | 8 | 0 | |
|
Yksd Allakaket School Allakaket · Yukon-Koyukuk Census Area County |
52 | 6 | 0 | |
|
Atka Aleutians West Census Area County |
50 | 7 | 0 | |
|
Southeast Alaska Logging Kodiak · Kodiak Island Borough County |
45 | 6 | 0 | |
|
Stevens Village Water System Stevens Village · Yukon-Koyukuk Census Area County |
28 | 6 | 2 | |
|
Unalaska Water System Unalaska · Aleutians West Census Area County |
9,400 | 6 | 0 | |
|
Petersburg Petersburg · County |
3,218 | 3 | 0 | |
|
Dillingham Water System Dillingham · Dillingham Census Area County |
2,419 | 7 | 0 | |
|
Haines Borough Haines · Haines Borough County |
2,376 | 6 | 0 | |
|
Metlakatla Metlakatla · County |
1,575 | 9 | 3 | |
|
City of Hooper Bay Hooper Bay · County |
1,375 | 10 | 4 | |
|
Penland Park MHP Anchorage · Anchorage Municipality County |
993 | 1 | 0 | |
|
Hoonah PWS Hoonah · County |
980 | 7 | 0 | |
|
Chevak Water System Chevak · County |
938 | 7 | 2 | |
|
Mountain Village Water System Mountain Village · County |
887 | 11 | 2 | |
|
Sand Point Water System Sand Point · Aleutians East Borough County |
830 | 7 | 0 | |
|
Worley Water Truck #30030 Deadhorse · North Slope Borough County |
770 | 2 | 0 | |
|
Worley Water Truck #30031 Deadhorse · North Slope Borough County |
770 | 2 | 0 | |
|
Worley Water Truck #30032 Deadhorse · North Slope Borough County |
770 | 2 | 0 | |
|
Worley Water Truck #30033 Deadhorse · North Slope Borough County |
770 | 2 | 0 | |
|
Kwethluk New Piped Water System Kwethluk · Bethel Census Area County |
760 | 11 | 2 | |
|
Yakutat PWS Yakutat · Yakutat City and Borough County |
740 | 2 | 0 | |
|
Unified Alaskan Utilities-Homestead Div. Eagle River · Anchorage Municipality County |
708 | 2 | 0 | |
|
The Water Service Barrow · North Slope Borough County |
638 | 3 | 0 | |
|
Kotlik Water System Kotlik · County |
617 | 9 | 1 | |
|
Nsbu Wainwright Wainwright · North Slope Borough County |
600 | 3 | 0 | |
|
Stebbins City Water Supply Stebbins · Nome Census Area County |
590 | 4 | 0 | |
|
Pilot Station Water System Pilot Station · County |
580 | 6 | 1 | |
|
Shishmaref Water System Shishmaref · Nome Census Area County |
572 | 5 | 0 | |
|
Alakanuk Water System Alakanuk · County |
570 | 14 | 2 | |
|
St. Marys Water System Saint Mary's · County |
548 | 6 | 1 | |
|
Kongiganak Water System Kongiganak · Bethel Census Area County |
547 | 7 | 0 | |
|
Nunapitchuk Water System Nunapitchuk · Bethel Census Area County |
496 | 6 | 1 | |
|
Bethel Trailer Court Bethel · Bethel Census Area County |
446 | 5 | 0 | |
|
Nsbu Nuiqsut Nuiqsut · North Slope Borough County |
443 | 3 | 0 | |
|
Brevig Mission Water System Brevig Mission · Nome Census Area County |
442 | 5 | 0 | |
|
Seldovia Water System Seldovia · Kenai Peninsula Borough County |
418 | 5 | 0 | |
|
Hydaburg Hydaburg · County |
415 | 10 | 3 | |
|
False Pass Treatment Plant False Pass · Aleutians East Borough County |
393 | 4 | 0 | |
|
Lksd Tununak Paul Albert HS Tununak · Bethel Census Area County |
385 | 9 | 0 | |
|
Saint Paul Water System Saint Paul · Aleutians West Census Area County |
380 | 7 | 1 | |
|
Tuluksak Water System Tuluksak · Bethel Census Area County |
373 | 9 | 0 | |
|
Akiak Community Water System Akiak · Bethel Census Area County |
346 | 6 | 0 | |
|
McGrath Water System Mcgrath · Yukon-Koyukuk Census Area County |
341 | 5 | 0 | |
|
Huslia Public Water System Huslia · Yukon-Koyukuk Census Area County |
323 | 4 | 2 | |
|
Atmautluak Water System Atmautluak · Bethel Census Area County |
311 | 8 | 1 | |
|
Marshall Water System Marshall · County |
308 | 8 | 0 | |
|
Lower Kalskag Water System Kalskag Upper / Lower · Bethel Census Area County |
302 | 5 | 2 | |
|
Denali Rock Creek Hq. Denali Park · Denali Borough County |
300 | 3 | 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 Alaska 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.