Surface Water Treatment Rule (SWTR) violations in Alaska
141 active public water systems in Alaska had a Surface Water Treatment Rule (SWTR) violation in the past three years, 57 of them in the latest quarter of EPA's data. What Surface Water Treatment Rule (SWTR) is and why it matters.
Health effects: Without proper filtration/disinfection: Giardia lamblia (severe diarrhea, cramping), Cryptosporidium (life-threatening for immunocompromised individuals), viruses (hepatitis A, norovirus). Turbidity itself is not a health risk but can shield pathogens from disinfection.
Systems with a Surface Water Treatment Rule (SWTR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Grande Denali / Denali Bluffs Denali Park · Denali Borough County |
1,000 | 3 | 0 | |
|
Selawik Safewater Facility Selawik · Northwest Arctic Borough County |
846 | 9 | 3 | |
|
Kwethluk New Piped Water System Kwethluk · Bethel Census Area County |
760 | 11 | 2 | |
|
Gambell Water System Gambell · Nome Census Area County |
669 | 10 | 2 | |
|
Ft. Yukon Public Water System Fort Yukon · Yukon-Koyukuk Census Area County |
665 | 6 | 1 | |
|
Scammon Bay Water System Scammon Bay · County |
637 | 7 | 0 | |
|
Buckland Water System Buckland · Northwest Arctic Borough County |
600 | 11 | 1 | |
|
Stebbins City Water Supply Stebbins · Nome Census Area County |
590 | 4 | 0 | |
|
St. Michael Water System Saint Michael · Nome Census Area County |
495 | 6 | 1 | |
|
Silver Bay Seafoods False Pass False Pass · Aleutians East Borough County |
470 | 7 | 0 | |
|
Kivalina Water System Kivalina · Northwest Arctic Borough County |
452 | 7 | 0 | |
|
Angoon Public Water Angoon · County |
450 | 13 | 2 | |
|
Kwigillingok Washeteria Kwigillingok · Bethel Census Area County |
400 | 10 | 0 | |
|
False Pass Treatment Plant False Pass · Aleutians East Borough County |
393 | 4 | 0 | |
|
Nikolaevsk Community Water System Nikolaevsk · Kenai Peninsula Borough County |
360 | 6 | 0 | |
|
Adak Utilities Adak · Aleutians West Census Area County |
325 | 4 | 1 | |
|
Elim Water Supply Elim · Nome Census Area County |
320 | 5 | 1 | |
|
Shungnak Water System Shungnak · Northwest Arctic Borough County |
299 | 8 | 1 | |
|
Nanwalek Nanwalek · Kenai Peninsula Borough County |
281 | 11 | 2 | |
|
Koyuk Public Water System Koyuk · Nome Census Area County |
277 | 7 | 1 | |
|
Larsen Bay Water System Larsen Bay · Kodiak Island Borough County |
271 | 11 | 0 | |
|
Too'gha INC in Tanana Tanana · Yukon-Koyukuk Census Area County |
271 | 9 | 1 | |
|
Shaktoolik Water System Shaktoolik · Nome Census Area County |
270 | 6 | 0 | |
|
Goodnews Bay Goodnews Bay · Bethel Census Area County |
250 | 5 | 0 | |
|
McCarthy Lodge Glennallen · County |
215 | 2 | 0 | |
|
Grayling Water System Grayling · Yukon-Koyukuk Census Area County |
207 | 13 | 2 | |
|
Nondalton Nondalton · Lake and Peninsula Borough County |
205 | 10 | 2 | |
|
Chignik Bay Water System Chignik Bay · Lake and Peninsula Borough County |
199 | 6 | 1 | |
|
Arctic Village Water System Arctic Village · Yukon-Koyukuk Census Area County |
175 | 8 | 2 | |
|
Uaf/iab Toolik Field Station Fairbanks · Fairbanks North Star Borough County |
175 | 2 | 0 | |
|
Waterfall Resort Ketchikan · Ketchikan Gateway Borough County |
168 | 4 | 0 | |
|
Kokhanok Water & WW System Kokhanok · Lake and Peninsula Borough County |
160 | 7 | 0 | |
|
Golovin Community Water System Golovin · Nome Census Area County |
150 | 8 | 2 | |
|
Kako Retreat Center Russian Mission · County |
122 | 4 | 2 | |
|
Chilkat Indian Village Haines · Haines Borough County |
113 | 10 | 1 | |
|
Hughes Public Water Supply Hughes · Yukon-Koyukuk Census Area County |
107 | 9 | 2 | |
|
North Slope Borough SA 10 Deadhorse, Prudhoe Bay · North Slope Borough County |
100 | 1 | 0 | |
|
Akutan Akutan · Aleutians East Borough County |
95 | 10 | 0 | |
|
Port Alexander PWS Port Alexander · Sitka City and Borough County |
95 | 5 | 0 | |
|
Tatitlek Water System Tatitlek · County |
95 | 8 | 0 | |
|
Perryville Water System Perryville · Lake and Peninsula Borough County |
88 | 11 | 0 | |
|
Diomede Joint Utilities Little Diomede · Nome Census Area County |
83 | 11 | 1 | |
|
Native Village of Sleetmute Sleetmute · Bethel Census Area County |
82 | 8 | 0 | |
|
Chalkyitsik Village Water Chalkyitsik · Yukon-Koyukuk Census Area County |
76 | 7 | 2 | |
|
Saltry Halibut Cove · Kenai Peninsula Borough County |
75 | 5 | 0 | |
|
Takotna Water System Takotna · Yukon-Koyukuk Census Area County |
70 | 7 | 1 | |
|
Whalers Cove Lodge Angoon · County |
65 | 4 | 2 | |
|
Karluk Water System Karluk · Kodiak Island Borough County |
60 | 2 | 1 | |
|
Nelson Lagoon Water System Nelson Lagoon · Aleutians East Borough County |
60 | 8 | 0 | |
|
Port Protection Ketchikan · Ketchikan Gateway Borough County |
60 | 2 | 2 |
About this data
A system is counted once if any of its violations in the past three years involved Surface Water Treatment Rule (SWTR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Surface Water Treatment Rule (SWTR) 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.