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 | 15/100 |
| Median value | 45/100 |
| State | Alaska |
100 Lowest-Ranked ZIP Codes
| Rank | ZIP Code | City | State | Reliability Score | Safety Score |
|---|---|---|---|---|---|
| 1 | 99752 | Kotzebue | AK | 15/100 | 59/100 |
| 2 | 99925 | Klawock | AK | 15/100 | 55/100 |
| 3 | 99663 | Seldovia | AK | 16/100 | 72/100 |
| 4 | 99628 | Manokotak | AK | 20/100 | 89/100 |
| 5 | 99640 | Nondalton | AK | 20/100 | 87/100 |
| 6 | 99643 | Old Harbor | AK | 20/100 | 43/100 |
| 7 | 99668 | Sleetmute | AK | 20/100 | 79/100 |
| 8 | 99736 | Deering | AK | 20/100 | 66/100 |
| 9 | 99739 | Elim | AK | 20/100 | 88/100 |
| 10 | 99741 | Galena | AK | 20/100 | 67/100 |
| 11 | 99750 | Kivalina | AK | 20/100 | 66/100 |
| 12 | 99751 | Kobuk | AK | 20/100 | 74/100 |
| 13 | 99777 | Tanana | AK | 20/100 | 72/100 |
| 14 | 99783 | Wales | AK | 20/100 | 75/100 |
| 15 | 99788 | Chalkyitsik | AK | 20/100 | 64/100 |
| 16 | 99820 | Angoon | AK | 20/100 | 69/100 |
| 17 | 99830 | Kake | AK | 20/100 | 39/100 |
| 18 | 99918 | Coffman Cove | AK | 20/100 | 66/100 |
| 19 | 99922 | Hydaburg | AK | 20/100 | 77/100 |
| 20 | 99778 | Teller | AK | 23/100 | 80/100 |
| 21 | 99658 | Saint Marys | AK | 24/100 | 75/100 |
| 22 | 99559 | Bethel | AK | 25/100 | 81/100 |
| 23 | 99581 | Emmonak | AK | 25/100 | 67/100 |
| 24 | 99620 | Kotlik | AK | 25/100 | 62/100 |
| 25 | 99621 | Kwethluk | AK | 25/100 | 70/100 |
| 26 | 99662 | Scammon Bay | AK | 25/100 | 68/100 |
| 27 | 99669 | Soldotna | AK | 25/100 | 53/100 |
| 28 | 99684 | Unalakleet | AK | 25/100 | 36/100 |
| 29 | 99727 | Buckland | AK | 25/100 | 66/100 |
| 30 | 99742 | Gambell | AK | 25/100 | 93/100 |
| 31 | 99770 | Selawik | AK | 25/100 | 70/100 |
| 32 | 99771 | Shaktoolik | AK | 26/100 | 88/100 |
| 33 | 99773 | Shungnak | AK | 26/100 | 95/100 |
| 34 | 99763 | Noorvik | AK | 28/100 | 94/100 |
| 35 | 99827 | Haines | AK | 28/100 | 94/100 |
| 36 | 99901 | Ketchikan | AK | 28/100 | 65/100 |
| 37 | 99672 | Sterling | AK | 29/100 | 70/100 |
| 38 | 99680 | Tuntutuliak | AK | 29/100 | 97/100 |
| 39 | 99681 | Tununak | AK | 29/100 | 97/100 |
| 40 | 99655 | Quinhagak | AK | 30/100 | 85/100 |
| 41 | 99664 | Seward | AK | 31/100 | 66/100 |
| 42 | 99553 | Akutan | AK | 32/100 | 98/100 |
| 43 | 99578 | Eek | AK | 32/100 | 98/100 |
| 44 | 99585 | Marshall | AK | 32/100 | 83/100 |
| 45 | 99634 | Napakiak | AK | 32/100 | 95/100 |
| 46 | 99679 | Tuluksak | AK | 32/100 | 94/100 |
| 47 | 99720 | Allakaket | AK | 32/100 | 94/100 |
| 48 | 99776 | Tanacross | AK | 32/100 | 78/100 |
| 49 | 99554 | Alakanuk | AK | 34/100 | 82/100 |
| 50 | 99701 | Fairbanks | AK | 34/100 | 68/100 |
| 51 | 99705 | North Pole | AK | 34/100 | 73/100 |
| 52 | 99709 | Fairbanks | AK | 34/100 | 68/100 |
| 53 | 99712 | Fairbanks | AK | 34/100 | 78/100 |
| 54 | 99775 | Fairbanks | AK | 34/100 | 77/100 |
| 55 | 99546 | Adak | AK | 35/100 | 62/100 |
| 56 | 99550 | Port Lions | AK | 35/100 | 83/100 |
| 57 | 99589 | Goodnews Bay | AK | 35/100 | 81/100 |
| 58 | 99622 | Kwigillingok | AK | 35/100 | 81/100 |
| 59 | 99661 | Sand Point | AK | 35/100 | 92/100 |
| 60 | 99675 | Takotna | AK | 35/100 | 81/100 |
| 61 | 99722 | Arctic Village | AK | 35/100 | 81/100 |
| 62 | 99768 | Ruby | AK | 35/100 | 74/100 |
| 63 | 99604 | Hooper Bay | AK | 36/100 | 84/100 |
| 64 | 99641 | Nunapitchuk | AK | 36/100 | 95/100 |
| 65 | 99558 | Anvik | AK | 37/100 | 94/100 |
| 66 | 99588 | Glennallen | AK | 37/100 | 83/100 |
| 67 | 99611 | Kenai | AK | 37/100 | 79/100 |
| 68 | 99632 | Mountain Village | AK | 37/100 | 83/100 |
| 69 | 99919 | Thorne Bay | AK | 37/100 | 54/100 |
| 70 | 99781 | Venetie | AK | 39/100 | 97/100 |
| 71 | 99501 | Anchorage | AK | 40/100 | 70/100 |
| 72 | 99502 | Anchorage | AK | 40/100 | 70/100 |
| 73 | 99503 | Anchorage | AK | 40/100 | 70/100 |
| 74 | 99504 | Anchorage | AK | 40/100 | 65/100 |
| 75 | 99507 | Anchorage | AK | 40/100 | 65/100 |
| 76 | 99508 | Anchorage | AK | 40/100 | 65/100 |
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: 2026-04-13.
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.
Explore More Rankings
- Worst ZIP Codes for Lead in Water in Alaska
- ZIP Codes with Most EPA Violations in Alaska
- Lowest Home Safety Scores in Alaska
- Safest ZIP Codes in Alaska — Highest Safety Scores
- ZIP Codes with Highest Flood Risk in Alaska
- ZIP Codes with Highest Energy Costs in Alaska
- ZIP Codes with Highest Radon Risk
- ZIP Codes with PFAS Detections in Alaska
- ZIP Codes with Highest Environmental Justice Concern
- Worst ZIP Codes for Homebuyers — Hidden Risk Factors
- ZIP Codes with Worst CO & Gas Risk in Alaska
- Safest ZIP Codes for Gas & CO Risk in Alaska
- ZIP Codes with Worst Wildfire Smoke Risk
- Safest ZIP Codes for Wildfire Smoke
- All Rankings