Interim Enhanced Surface Water Treatment Rule violations in Alaska
89 active public water systems in Alaska had a Interim Enhanced Surface Water Treatment Rule violation in the past three years, 31 of them in the latest quarter of EPA's data. What Interim Enhanced Surface Water Treatment Rule is and why it matters.
Health effects: Violations indicate failure to meet treatment technique requirements that reduce exposure to Cryptosporidium, Giardia, and other microbial pathogens. Cryptosporidium poses the greatest risk to immunocompromised individuals, infants, and the elderly, and can cause severe or fatal illness in vulnerable populations.
Systems with a Interim Enhanced Surface Water Treatment Rule violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
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 | |
|
Kivalina Water System Kivalina · Northwest Arctic Borough County |
452 | 7 | 0 | |
|
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 | |
|
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 | |
|
Eek Water System Eek · Bethel Census Area County |
280 | 9 | 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 | |
|
Grayling Water System Grayling · Yukon-Koyukuk Census Area County |
207 | 13 | 2 | |
|
Arctic Village Water System Arctic Village · Yukon-Koyukuk Census Area County |
175 | 8 | 2 | |
|
Golovin Community Water System Golovin · Nome Census Area County |
150 | 8 | 2 | |
|
Chilkat Indian Village Haines · Haines Borough County |
113 | 10 | 1 | |
|
Hughes Public Water Supply Hughes · Yukon-Koyukuk Census Area County |
107 | 9 | 2 | |
|
Port Alexander PWS Port Alexander · Sitka City and Borough County |
95 | 5 | 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 | |
|
Chalkyitsik Village Water Chalkyitsik · Yukon-Koyukuk Census Area County |
76 | 7 | 2 | |
|
Takotna Water System Takotna · Yukon-Koyukuk Census Area County |
70 | 7 | 1 | |
|
Whalers Cove Lodge Angoon · County |
65 | 4 | 2 | |
|
Nelson Lagoon Water System Nelson Lagoon · Aleutians East Borough County |
60 | 8 | 0 | |
|
Sportsmans Cove Lodge Ketchikan · Ketchikan Gateway Borough County |
55 | 4 | 1 | |
|
Islander Bar & Restaurant Wasilla · Matanuska-Susitna Borough County |
38 | 3 | 2 | |
|
Barrow Utilities & Elec. Coop., Inc. (bu Barrow · North Slope Borough County |
4,900 | 2 | 0 | |
|
Denali Main / Front Country Denali Park · Denali Borough County |
4,122 | 7 | 1 | |
|
Uscg Station Kodiak Kodiak · Kodiak Island Borough County |
3,092 | 3 | 1 | |
|
Haines Borough Haines · Haines Borough County |
2,376 | 6 | 0 | |
|
Metlakatla Metlakatla · County |
1,575 | 9 | 3 | |
|
Hilcorp Pboc Prudhoe Bay · North Slope Borough County |
1,200 | 2 | 0 | |
|
Grande Denali / Denali Bluffs Denali Park · Denali Borough County |
1,000 | 3 | 0 | |
|
Hoonah PWS Hoonah · County |
980 | 7 | 0 | |
|
Klawock Klawock · County |
904 | 3 | 0 | |
|
Sand Point Water System Sand Point · Aleutians East Borough County |
830 | 7 | 0 | |
|
Emmonak Water System Emmonak · County |
820 | 10 | 3 | |
|
Eaglecrest Ski Area Juneau · Juneau City and Borough County |
771 | 3 | 0 | |
|
Unalakleet City Water Supply Unalakleet · Nome Census Area County |
757 | 6 | 0 | |
|
Noorvik Water System Noorvik · Northwest Arctic Borough County |
735 | 6 | 1 | |
|
Kipnuk Water System Kipnuk · Bethel Census Area County |
639 | 8 | 0 | |
|
Kotlik Water System Kotlik · County |
617 | 9 | 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 |
About this data
A system is counted once if any of its violations in the past three years involved Interim Enhanced Surface Water Treatment Rule, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Interim Enhanced Surface Water Treatment Rule 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.