Clasificaciones 2026

Sistemas de agua menos confiables en Washington — 2026

Última actualización: 4 de junio de 2026

732 códigos postales clasificados por Reliability Score N.º 1: código postal 98243 (Deer Harbor, WA) — 15/100
Plomo Infracciones Puntuación más baja Más seguros Riesgo de inundación Costo de energía Radón PFAS Confiabilidad Índice EJ Riesgo para compradores CO y gas Gas más seguro Carga de remediación Infracciones sin resolver (por proveedor) Equidad del agua (por proveedor)

Out of 732 ZIP codes with data in Washington, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All Washington Rankings

Statistic Value
ZIP codes ranked 732
Lowest value 15/100
Median value 73/100
State Washington

100 Lowest-Ranked ZIP Codes

Rank ZIP Code City State Reliability Score Safety Score
1 98243 Deer Harbor WA 15/100 66/100
2 98250 Friday Harbor WA 15/100 70/100
3 99336 Kennewick WA 20/100 58/100
4 99337 Kennewick WA 20/100 58/100
5 99338 Kennewick WA 20/100 58/100
6 98277 Oak Harbor WA 25/100 66/100
7 98278 Oak Harbor WA 25/100 71/100
8 98832 Marlin WA 27/100 78/100
9 98582 Salkum WA 30/100 62/100
10 98595 Westport WA 33/100 74/100
11 98224 Baring WA 35/100 73/100
12 98262 Lummi Island WA 38/100 85/100
13 98672 White Salmon WA 39/100 78/100
14 99114 Colville WA 40/100 56/100
15 99118 Curlew WA 40/100 48/100
16 99323 Burbank WA 40/100 71/100
17 98941 Roslyn WA 42/100 72/100
18 98930 Grandview WA 44/100 81/100
19 98266 Maple Falls WA 45/100 91/100
20 98272 Monroe WA 45/100 69/100
21 98565 Napavine WA 45/100 95/100
22 99157 Northport WA 45/100 64/100
23 99344 Othello WA 45/100 72/100
24 98816 Chelan WA 47/100 91/100
25 99343 Mesa WA 47/100 62/100
26 98572 Pe Ell WA 49/100 90/100
27 98027 Issaquah WA 50/100 74/100
28 98029 Issaquah WA 50/100 89/100
29 98068 Snoqualmie Pass WA 50/100 81/100
30 98223 Arlington WA 50/100 78/100
31 98236 Clinton WA 50/100 71/100
32 98511 Tumwater WA 50/100 77/100
33 98849 Riverside WA 50/100 59/100
34 98951 Wapato WA 50/100 67/100
35 99020 Marshall WA 50/100 54/100
36 99156 Newport WA 50/100 51/100
37 99371 Washtucna WA 50/100 75/100
38 98245 Eastsound WA 52/100 93/100
39 98264 Lynden WA 52/100 89/100
40 99349 Mattawa WA 52/100 82/100
41 98001 Auburn WA 55/100 84/100
42 98002 Auburn WA 55/100 84/100
43 98036 Lynnwood WA 55/100 76/100
44 98071 Auburn WA 55/100 93/100
45 98092 Auburn WA 55/100 84/100
46 98253 Greenbank WA 55/100 85/100
47 98256 Index WA 55/100 82/100
48 98260 Langley WA 55/100 80/100
49 98365 Port Ludlow WA 55/100 87/100
50 98381 Sekiu WA 55/100 93/100
51 98520 Aberdeen WA 55/100 71/100
52 98532 Chehalis WA 55/100 75/100
53 98831 Manson WA 55/100 88/100
54 98837 Moses Lake WA 55/100 72/100
55 98848 Quincy WA 55/100 75/100
56 98857 Warden WA 55/100 78/100
57 98948 Toppenish WA 55/100 73/100
58 99031 Spangle WA 55/100 67/100
59 99032 Sprague WA 55/100 77/100
60 99111 Colfax WA 55/100 78/100
61 99119 Cusick WA 55/100 60/100
62 99143 Lacrosse WA 55/100 72/100
63 99163 Pullman WA 55/100 73/100
64 99164 Pullman WA 55/100 78/100
65 99165 Pullman WA 55/100 78/100
66 99180 Usk WA 55/100 61/100
67 99335 Kahlotus WA 55/100 79/100
68 99301 Pasco WA 56/100 80/100
69 99302 Pasco WA 56/100 79/100
70 98239 Coupeville WA 57/100 94/100
71 98953 Zillah WA 57/100 82/100
72 99003 Chattaroy WA 57/100 69/100
73 98252 Granite Falls WA 58/100 83/100
74 98623 Husum WA 58/100 78/100
75 99161 Palouse WA 58/100 81/100
76 98011 Bothell WA 60/100 84/100
77 98021 Bothell WA 60/100 84/100
78 98043 Mountlake Terrace WA 60/100 85/100
79 98233 Burlington WA 60/100 77/100
80 98241 Darrington WA 60/100 85/100
81 98247 Everson WA 60/100 78/100
82 98257 La Conner WA 60/100 88/100
83 98286 Shaw Island WA 60/100 66/100
84 98356 Morton WA 60/100 87/100
85 98357 Neah Bay WA 60/100 66/100
86 98360 Orting WA 60/100 83/100
87 98391 Bonney Lake WA 60/100 65/100
88 98396 Wilkeson WA 60/100 92/100
89 98533 Cinebar WA 60/100 66/100
90 98552 Humptulips WA 60/100 73/100
91 98563 Montesano WA 60/100 81/100
92 98641 Oysterville WA 60/100 99/100
93 98802 East Wenatchee WA 60/100 73/100
94 98819 Conconully WA 60/100 40/100
95 98823 Ephrata WA 60/100 70/100
96 98826 Leavenworth WA 60/100 81/100
97 98846 Pateros WA 60/100 67/100
98 98853 Stratford WA 60/100 53/100
99 98862 Winthrop WA 60/100 64/100
100 98922 Cle Elum WA 60/100 49/100

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.

Explore More Rankings

Cómo se calcula esta clasificación, fuentes de datos y limitaciones: Metodología de clasificaciones →

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Seguridad del hogar 2026 Combinación de riesgo de agua, plomo, radón y ambiental PFAS 2026 Químicos eternos detectados en el agua potable Riesgo de plomo 2026 Infraestructura de tuberías de plomo y excedencias de la EPA
Aviso: Las clasificaciones se basan en datos de la EPA, la FEMA y agencias federales. Reflejan patrones históricos e indicadores de riesgo, no necesariamente las condiciones actuales. Para obtener la información más actual, los residentes pueden comunicarse con la compañía local de agua o solicitar un Informe de Confianza del Consumidor (CCR).

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