Worst Infrastructure: Washington

Out of 704 ZIP codes with infrastructure data in Washington, these areas face the highest estimated risk of water pipe failure based on infrastructure age, funding gaps, and violation history.

Statistic	Value
ZIP codes ranked	704
Highest risk	90%
Median risk	37%
Average risk	39%
State	Washington

Top 100 Highest Risk ZIP Codes

Rank	ZIP Code	City	State	Pipe Failure Risk	Risk Level	Safety Score
1	98364	Port Gamble	WA	90%	Very High	73/100
2	98278	Oak Harbor	WA	87%	Very High	71/100
3	98830	Mansfield	WA	75%	Very High	63/100
4	98539	Doty	WA	74%	Very High	66/100
5	98644	Seaview	WA	73%	Very High	73/100
6	98526	Amanda Park	WA	72%	Very High	66/100
7	98438	Mcchord Afb	WA	70%	Very High	66/100
8	98504	Olympia	WA	69%	Very High	98/100
9	98505	Olympia	WA	69%	Very High	98/100
10	98507	Olympia	WA	69%	Very High	94/100
11	98508	Olympia	WA	69%	Very High	98/100
12	98599	Olympia	WA	69%	Very High	98/100
13	98638	Naselle	WA	69%	Very High	65/100
14	98222	Blakely Island	WA	68%	Very High	73/100
15	98238	Conway	WA	68%	Very High	73/100
16	98345	Keyport	WA	68%	Very High	66/100
17	98952	White Swan	WA	66%	Very High	53/100
18	99020	Marshall	WA	65%	Very High	54/100
19	98527	Bay Center	WA	63%	Very High	66/100
20	98297	Waldron	WA	62%	Very High	73/100
21	98286	Shaw Island	WA	61%	Very High	66/100
22	98511	Tumwater	WA	61%	Very High	77/100
23	98547	Grayland	WA	61%	Very High	65/100
24	98587	Taholah	WA	61%	Very High	66/100
25	98039	Medina	WA	60%	High	73/100
26	98586	South Bend	WA	60%	High	65/100
27	98280	Orcas	WA	59%	High	66/100
28	98320	Brinnon	WA	59%	High	65/100
29	98538	Curtis	WA	59%	High	65/100
30	98581	Ryderwood	WA	59%	High	66/100
31	98616	Cougar	WA	59%	High	40/100
32	98621	Grays River	WA	59%	High	65/100
33	98845	Palisades	WA	59%	High	63/100
34	98904	Yakima	WA	59%	High	82/100
35	98907	Yakima	WA	59%	High	82/100
36	98909	Yakima	WA	59%	High	82/100
37	98047	Pacific	WA	58%	High	60/100
38	98083	Kirkland	WA	58%	High	94/100
39	98205	Everett	WA	58%	High	87/100
40	98206	Everett	WA	58%	High	87/100
41	98207	Everett	WA	58%	High	91/100
42	98213	Everett	WA	58%	High	91/100
43	98355	Mineral	WA	58%	High	66/100
44	98392	Suquamish	WA	58%	High	73/100
45	98628	Klickitat	WA	58%	High	55/100
46	98860	Wilson Creek	WA	58%	High	53/100
47	98537	Cosmopolis	WA	57%	High	65/100
48	98673	Wishram	WA	57%	High	53/100
49	99116	Coulee Dam	WA	57%	High	66/100
50	98821	Dryden	WA	56%	High	87/100
51	98921	Buena	WA	56%	High	53/100
52	98939	Parker	WA	56%	High	53/100
53	99105	Benge	WA	56%	High	53/100
54	99328	Dayton	WA	56%	High	78/100
55	98624	Ilwaco	WA	55%	High	70/100
56	98647	Skamokawa	WA	55%	High	65/100
57	98941	Roslyn	WA	55%	High	72/100
58	98071	Auburn	WA	54%	High	93/100
59	98324	Carlsborg	WA	54%	High	98/100
60	98544	Galvin	WA	54%	High	65/100
61	98585	Silver Creek	WA	54%	High	73/100
62	99136	Hay	WA	54%	High	53/100
63	98235	Clearlake	WA	53%	High	65/100
64	98359	Olalla	WA	53%	High	73/100
65	98562	Moclips	WA	53%	High	73/100
66	98643	Rosburg	WA	53%	High	65/100
67	98827	Loomis	WA	53%	High	40/100
68	98836	Monitor	WA	53%	High	73/100
69	99329	Dixie	WA	53%	High	63/100
70	98263	Lyman	WA	52%	High	73/100
71	98351	Longbranch	WA	52%	High	73/100
72	98353	Manchester	WA	52%	High	99/100
73	98509	Lacey	WA	52%	High	96/100
74	98520	Aberdeen	WA	52%	High	71/100
75	98666	Vancouver	WA	52%	High	69/100
76	98668	Vancouver	WA	52%	High	65/100
77	98687	Vancouver	WA	52%	High	65/100
78	98923	Cowiche	WA	52%	High	63/100
79	98572	Pe Ell	WA	51%	High	90/100
80	98602	Appleton	WA	51%	High	53/100
81	98619	Glenwood	WA	51%	High	53/100
82	99102	Albion	WA	51%	High	81/100
83	99134	Harrington	WA	51%	High	53/100
84	98013	Burton	WA	50%	High	73/100
85	98035	Kent	WA	50%	High	99/100
86	98041	Bothell	WA	50%	High	85/100
87	98064	Kent	WA	50%	High	99/100
88	98089	Kent	WA	50%	High	99/100
89	98243	Deer Harbor	WA	50%	High	66/100
90	98259	North Lakewood	WA	50%	High	66/100
91	98314	Bremerton	WA	50%	High	99/100
92	98337	Bremerton	WA	50%	High	99/100
93	98343	Joyce	WA	50%	High	98/100
94	98583	Satsop	WA	50%	High	94/100
95	98590	Tokeland	WA	50%	High	60/100
96	98603	Ariel	WA	50%	High	40/100
97	98807	Wenatchee	WA	50%	High	98/100
98	98817	Chelan Falls	WA	50%	High	66/100
99	98859	Wauconda	WA	50%	High	40/100
100	99135	Hartline	WA	50%	High	53/100

Methodology

Infrastructure risk rankings combine four data sources, each weighted equally (25%): (1) EPA Drinking Water Infrastructure Needs Survey (DWINS 2023) — state-level 20-year funding gap per capita for pipe replacement, treatment, and storage; (2) Census ACS housing vintage — percentage of homes built before 1980, when lead solder and galvanized pipes were common; (3) EPA SDWIS violation and enforcement data — system-level compliance history; (4) Lead and Copper Rule indicators — service line material inventories and 90th percentile lead testing results. The combined score is normalized to a 0-100% probability scale.

Data sources: EPA DWINS 2023, Census ACS, EPA SDWIS, Lead and Copper Rule data. Last updated: 2026-07-19.

Frequently Asked Questions

What does pipe failure probability mean?

Pipe failure probability estimates the likelihood of water main breaks, lead contamination from corroded pipes, or service disruptions based on infrastructure age, state funding gaps, violation history, and lead indicators. It is not a prediction of imminent failure, but a risk assessment based on known factors.

How is infrastructure risk calculated?

The risk score combines four equally weighted factors: state-level infrastructure funding gap per capita (from EPA DWINS 2023), housing vintage (Census ACS pre-1980 housing percentage), water system violation and enforcement history (EPA SDWIS), and lead exposure indicators (service line probability and testing results).

What can homeowners do about aging infrastructure?

Test your tap water annually, especially for lead. Check if your home has a lead service line through your water utility. Consider a whole-house water filter (NSF/ANSI 53 certified). Review your water system Consumer Confidence Report for violation history.

Does high risk mean my water is unsafe right now?

Not necessarily. Infrastructure risk indicates long-term vulnerability, not current contamination. However, areas with aging pipes and high violation counts have a statistically higher chance of water quality issues. Regular testing is the best way to verify your water safety.

Worst Infrastructure: Washington — 2026 Rankings