ZIP Codes with Most EPA Violations in Washington

Out of 311 ZIP codes with data in Washington, these are the highest-ranked areas for recorded epa violations. See also: National ZIP Codes with Most EPA Water Violations | All Washington Rankings

Statistic	Value
ZIP codes ranked	311
Highest value	166
Median value	5
State	Washington

Top 100 Worst ZIP Codes

Rank	ZIP Code	City	State	Recorded EPA Violations	Safety Score
1	98528	Belfair	WA	166	—
2	98277	Oak Harbor	WA	152	—
3	98848	Quincy	WA	132	67/100
4	99156	Newport	WA	127	—
5	99362	Walla Walla	WA	119	67/100
6	98382	Sequim	WA	107	83/100
7	99324	College Place	WA	106	67/100
8	98282	Camano Island	WA	92	—
9	98338	Graham	WA	91	67/100
10	98328	Eatonville	WA	86	83/100
11	98239	Coupeville	WA	80	—
12	98321	Buckley	WA	62	92/100
13	98360	Orting	WA	58	94/100
14	98260	Langley	WA	57	—
15	98837	Moses Lake	WA	57	50/100
16	99301	Pasco	WA	54	79/100
17	98249	Freeland	WA	48	—
18	98323	Carbonado	WA	48	—
19	98396	Wilkeson	WA	48	—
20	98823	Ephrata	WA	48	—
21	98019	Duvall	WA	45	85/100
22	99003	Chattaroy	WA	43	36/100
23	99006	Deer Park	WA	43	36/100
24	99009	Elk	WA	43	—
25	99338	Kennewick	WA	39	61/100
26	99352	Richland	WA	39	61/100
27	98951	Wapato	WA	38	70/100
28	98502	Olympia	WA	34	69/100
29	98648	Stevenson	WA	32	—
30	98248	Ferndale	WA	31	86/100
31	99350	Prosser	WA	29	74/100
32	98901	Yakima	WA	27	74/100
33	98908	Yakima	WA	26	74/100
34	98936	Moxee	WA	26	74/100
35	98532	Chehalis	WA	25	96/100
36	98930	Grandview	WA	25	75/100
37	99320	Benton City	WA	24	59/100
38	98230	Blaine	WA	23	89/100
39	98605	Bingen	WA	23	—
40	98240	Custer	WA	22	—
41	99353	West Richland	WA	22	76/100
42	98253	Greenbank	WA	21	—
43	98902	Yakima	WA	21	76/100
44	98903	Yakima	WA	21	76/100
45	99217	Spokane	WA	21	42/100
46	98387	Spanaway	WA	20	77/100
47	99206	Spokane	WA	20	59/100
48	99216	Spokane	WA	20	42/100
49	98651	Underwood	WA	19	—
50	98223	Arlington	WA	17	92/100
51	98596	Winlock	WA	17	—
52	98816	Chelan	WA	17	96/100
53	99025	Newman Lake	WA	17	—
54	99027	Otis Orchards	WA	17	—
55	98272	Monroe	WA	16	95/100
56	98292	Stanwood	WA	16	—
57	98391	Bonney Lake	WA	16	94/100
58	98245	Eastsound	WA	15	—
59	98247	Everson	WA	15	92/100
60	98264	Lynden	WA	15	92/100
61	98092	Auburn	WA	14	79/100
62	98236	Clinton	WA	14	—
63	98250	Friday Harbor	WA	14	—
64	99016	Greenacres	WA	14	61/100
65	99037	Veradale	WA	14	61/100
66	98290	Snohomish	WA	13	96/100
67	98362	Port Angeles	WA	13	96/100
68	98370	Poulsbo	WA	13	93/100
69	98520	Aberdeen	WA	13	97/100
70	98610	Carson	WA	13	—
71	98262	Lummi Island	WA	12	—
72	98279	Olga	WA	12	—
73	98295	Sumas	WA	12	—
74	98372	Puyallup	WA	12	79/100
75	98374	Puyallup	WA	12	79/100
76	99344	Othello	WA	12	80/100
77	98371	Puyallup	WA	11	80/100
78	98271	Marysville	WA	10	97/100
79	98349	Lakebay	WA	10	—
80	98375	Puyallup	WA	10	80/100
81	98531	Centralia	WA	10	80/100
82	98953	Zillah	WA	10	—
83	99019	Liberty Lake	WA	10	63/100
84	99114	Colville	WA	10	63/100
85	99208	Spokane	WA	10	47/100
86	99223	Spokane	WA	10	46/100
87	99224	Spokane	WA	10	47/100
88	98303	Anderson Island	WA	9	—
89	98312	Bremerton	WA	9	97/100
90	98351	Longbranch	WA	9	—
91	98363	Port Angeles	WA	9	97/100
92	98501	Olympia	WA	9	80/100
93	98831	Manson	WA	9	97/100
94	99036	Valleyford	WA	9	—
95	98070	Vashon	WA	8	93/100
96	98110	Bainbridge Island	WA	8	97/100
97	98270	Marysville	WA	8	98/100
98	98367	Port Orchard	WA	8	81/100
99	98537	Cosmopolis	WA	8	—
100	98683	Vancouver	WA	8	46/100

Methodology

Violation counts include all types recorded in the EPA SDWIS database: Maximum Contaminant Level (MCL) violations, treatment technique violations, and monitoring/reporting violations. Both resolved and unresolved violations are counted. Higher counts may reflect longer system histories or larger service areas.

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: 2026-08-31.

Frequently Asked Questions

What counts as an EPA water violation?

EPA violations include exceeding Maximum Contaminant Levels (MCLs), failing to treat water properly (treatment technique violations), and not testing or reporting on schedule (monitoring violations). Health-based violations are the most serious.

Does a high violation count mean the water is unsafe now?

Not necessarily. Many violations are historical or monitoring-related. However, a pattern of repeated violations indicates systemic issues with water system management or infrastructure.

ZIP Codes with Most EPA Violations in Washington — 2026

Top 100 Worst ZIP Codes

Methodology

Frequently Asked Questions

What counts as an EPA water violation?

Does a high violation count mean the water is unsafe now?

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