Least Reliable Water Systems in Alaska — 2026

Out of 274 ZIP codes with data in Alaska, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All Alaska Rankings

Statistic	Value
ZIP codes ranked	274
Lowest value	25/100
Median value	55/100
State	Alaska

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Reliability Score	Safety Score
1	99752	Kotzebue	AK	25/100	59/100
2	99925	Klawock	AK	25/100	55/100
3	99663	Seldovia	AK	26/100	72/100
4	99628	Manokotak	AK	30/100	89/100
5	99640	Nondalton	AK	30/100	87/100
6	99643	Old Harbor	AK	30/100	43/100
7	99666	Nunam Iqua	AK	30/100	55/100
8	99668	Sleetmute	AK	30/100	79/100
9	99677	Tatitlek	AK	30/100	22/100
10	99736	Deering	AK	30/100	66/100
11	99739	Elim	AK	30/100	88/100
12	99741	Galena	AK	30/100	67/100
13	99750	Kivalina	AK	30/100	66/100
14	99751	Kobuk	AK	30/100	74/100
15	99777	Tanana	AK	30/100	72/100
16	99783	Wales	AK	30/100	75/100
17	99788	Chalkyitsik	AK	30/100	64/100
18	99820	Angoon	AK	30/100	69/100
19	99830	Kake	AK	30/100	39/100
20	99918	Coffman Cove	AK	30/100	66/100
21	99922	Hydaburg	AK	30/100	77/100
22	99665	Shageluk	AK	33/100	87/100
23	99778	Teller	AK	33/100	80/100
24	99658	Saint Marys	AK	34/100	75/100
25	99559	Bethel	AK	35/100	81/100
26	99581	Emmonak	AK	35/100	67/100
27	99620	Kotlik	AK	35/100	62/100
28	99621	Kwethluk	AK	35/100	70/100
29	99662	Scammon Bay	AK	35/100	68/100
30	99669	Soldotna	AK	35/100	53/100
31	99684	Unalakleet	AK	35/100	36/100
32	99727	Buckland	AK	35/100	66/100
33	99742	Gambell	AK	35/100	93/100
34	99770	Selawik	AK	35/100	70/100
35	99928	Ward Cove	AK	35/100	56/100
36	99745	Hughes	AK	36/100	92/100
37	99771	Shaktoolik	AK	36/100	88/100
38	99773	Shungnak	AK	36/100	95/100
39	99545	Kongiganak	AK	38/100	94/100
40	99763	Noorvik	AK	38/100	94/100
41	99827	Haines	AK	38/100	94/100
42	99836	Port Alexander	AK	38/100	83/100
43	99901	Ketchikan	AK	38/100	65/100
44	99950	Ketchikan	AK	38/100	67/100
45	99672	Sterling	AK	39/100	70/100
46	99680	Tuntutuliak	AK	39/100	97/100
47	99681	Tununak	AK	39/100	97/100
48	99501	Anchorage	AK	40/100	70/100
49	99502	Anchorage	AK	40/100	70/100
50	99503	Anchorage	AK	40/100	70/100
51	99504	Anchorage	AK	40/100	65/100
52	99507	Anchorage	AK	40/100	65/100
53	99508	Anchorage	AK	40/100	65/100
54	99509	Anchorage	AK	40/100	66/100
55	99510	Anchorage	AK	40/100	70/100
56	99511	Anchorage	AK	40/100	66/100
57	99513	Anchorage	AK	40/100	66/100
58	99514	Anchorage	AK	40/100	66/100
59	99515	Anchorage	AK	40/100	70/100
60	99516	Anchorage	AK	40/100	70/100
61	99517	Anchorage	AK	40/100	70/100
62	99518	Anchorage	AK	40/100	70/100
63	99519	Anchorage	AK	40/100	70/100
64	99520	Anchorage	AK	40/100	66/100
65	99521	Anchorage	AK	40/100	66/100
66	99522	Anchorage	AK	40/100	66/100
67	99523	Anchorage	AK	40/100	66/100
68	99524	Anchorage	AK	40/100	66/100
69	99529	Anchorage	AK	40/100	66/100
70	99530	Anchorage	AK	40/100	66/100
71	99599	Anchorage	AK	40/100	66/100
72	99655	Quinhagak	AK	40/100	85/100
73	99695	Anchorage	AK	40/100	66/100
74	99664	Seward	AK	41/100	66/100
75	99553	Akutan	AK	42/100	98/100
76	99578	Eek	AK	42/100	98/100
77	99585	Marshall	AK	42/100	83/100
78	99634	Napakiak	AK	42/100	95/100
79	99679	Tuluksak	AK	42/100	94/100
80	99720	Allakaket	AK	42/100	94/100
81	99767	Rampart	AK	42/100	94/100
82	99774	Stevens Village	AK	42/100	98/100
83	99776	Tanacross	AK	42/100	78/100
84	99554	Alakanuk	AK	44/100	82/100
85	99701	Fairbanks	AK	44/100	68/100
86	99705	North Pole	AK	44/100	73/100
87	99706	Fairbanks	AK	44/100	77/100
88	99707	Fairbanks	AK	44/100	78/100
89	99708	Fairbanks	AK	44/100	78/100
90	99709	Fairbanks	AK	44/100	68/100
91	99710	Fairbanks	AK	44/100	78/100
92	99711	Fairbanks	AK	44/100	77/100
93	99712	Fairbanks	AK	44/100	78/100
94	99775	Fairbanks	AK	44/100	77/100
95	99790	Fairbanks	AK	44/100	77/100
96	99546	Adak	AK	45/100	62/100
97	99548	Chignik Lake	AK	45/100	81/100
98	99550	Port Lions	AK	45/100	83/100
99	99589	Goodnews Bay	AK	45/100	81/100
100	99622	Kwigillingok	AK	45/100	81/100

Methodology

Water system reliability scores (0-100) combine violation frequency, violation recency, resolution rate, and system size. Systems with repeated health-based violations and unresolved issues score lowest. The reliability score focuses specifically on the water utility performance, distinct from the broader Home Safety Score.

Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-06-04.

Frequently Asked Questions

What does a low water reliability score mean?

A low reliability score (below 50) indicates a water system with frequent violations, poor resolution rates, or recurring compliance issues. These systems may have aging infrastructure, inadequate treatment, or management challenges.

How is reliability different from safety score?

The reliability score focuses specifically on the water utility performance (violations, resolution, compliance). The Home Safety Score is broader, also including lead risk, radon, and flood data. A ZIP code can have a reliable water system but still have high radon or flood risk.