ZIP Codes with Most EPA Violations in Arizona

Out of 288 ZIP codes with data in Arizona, these are the highest-ranked areas for recorded epa violations. See also: National ZIP Codes with Most EPA Water Violations | All Arizona Rankings

Statistic	Value
ZIP codes ranked	288
Highest value	892
Median value	23
State	Arizona

Top 100 Worst ZIP Codes

Rank	ZIP Code	City	State	Recorded EPA Violations	Safety Score
1	86426	Fort Mohave	AZ	892	67/100
2	86429	Bullhead City	AZ	862	50/100
3	86442	Bullhead City	AZ	842	50/100
4	85365	Yuma	AZ	515	67/100
5	85298	Gilbert	AZ	278	42/100
6	85249	Chandler	AZ	269	58/100
7	85367	Yuma	AZ	236	67/100
8	85635	Sierra Vista	AZ	229	67/100
9	85650	Sierra Vista	AZ	227	67/100
10	85615	Hereford	AZ	223	—
11	85142	Queen Creek	AZ	215	42/100
12	85212	Mesa	AZ	203	42/100
13	86351	Sedona	AZ	203	50/100
14	85206	Mesa	AZ	200	42/100
15	85209	Mesa	AZ	200	58/100
16	85234	Gilbert	AZ	200	42/100
17	85296	Gilbert	AZ	182	42/100
18	85233	Gilbert	AZ	174	42/100
19	85236	Higley	AZ	174	42/100
20	85295	Gilbert	AZ	174	42/100
21	85297	Gilbert	AZ	174	42/100
22	85901	Show Low	AZ	171	67/100
23	85139	Maricopa	AZ	166	58/100
24	85356	Wellton	AZ	129	—
25	85704	Tucson	AZ	129	58/100
26	85120	Apache Junction	AZ	123	58/100
27	85935	Pinetop	AZ	119	67/100
28	85328	Cibola	AZ	115	—
29	85334	Ehrenberg	AZ	115	—
30	85705	Tucson	AZ	109	42/100
31	85741	Tucson	AZ	109	42/100
32	86440	Mohave Valley	AZ	106	67/100
33	85653	Marana	AZ	103	42/100
34	85742	Tucson	AZ	101	42/100
35	85718	Tucson	AZ	100	58/100
36	85119	Apache Junction	AZ	97	58/100
37	85138	Maricopa	AZ	96	58/100
38	85745	Tucson	AZ	96	58/100
39	85912	White Mountain Lake	AZ	96	—
40	85248	Chandler	AZ	94	58/100
41	86005	Flagstaff	AZ	94	67/100
42	85395	Goodyear	AZ	91	44/100
43	86001	Flagstaff	AZ	88	67/100
44	85929	Lakeside	AZ	86	67/100
45	85225	Chandler	AZ	83	58/100
46	85286	Chandler	AZ	83	58/100
47	85340	Litchfield Park	AZ	79	42/100
48	85224	Chandler	AZ	77	58/100
49	85226	Chandler	AZ	77	58/100
50	85378	Surprise	AZ	77	58/100
51	85326	Buckeye	AZ	76	58/100
52	85737	Tucson	AZ	76	58/100
53	85621	Nogales	AZ	73	67/100
54	85132	Florence	AZ	72	42/100
55	85194	Casa Grande	AZ	72	—
56	85546	Safford	AZ	72	—
57	86305	Prescott	AZ	72	50/100
58	85355	Waddell	AZ	71	58/100
59	85756	Tucson	AZ	71	60/100
60	85131	Eloy	AZ	70	58/100
61	85350	Somerton	AZ	69	67/100
62	85641	Vail	AZ	69	58/100
63	85396	Buckeye	AZ	68	59/100
64	85374	Surprise	AZ	67	59/100
65	86004	Flagstaff	AZ	67	67/100
66	85335	El Mirage	AZ	65	59/100
67	85541	Payson	AZ	65	50/100
68	86011	Flagstaff	AZ	65	67/100
69	86323	Chino Valley	AZ	65	50/100
70	85387	Surprise	AZ	64	61/100
71	85543	Pima	AZ	63	—
72	85544	Pine	AZ	62	67/100
73	85730	Tucson	AZ	62	59/100
74	85937	Snowflake	AZ	59	67/100
75	85939	Taylor	AZ	59	—
76	85338	Goodyear	AZ	57	48/100
77	85364	Yuma	AZ	54	67/100
78	85938	Springerville	AZ	53	—
79	86314	Prescott Valley	AZ	53	67/100
80	85379	Surprise	AZ	49	66/100
81	86301	Prescott	AZ	49	50/100
82	86303	Prescott	AZ	49	50/100
83	85388	Surprise	AZ	47	66/100
84	85629	Sahuarita	AZ	47	58/100
85	85747	Tucson	AZ	47	66/100
86	86338	Skull Valley	AZ	47	—
87	85602	Benson	AZ	45	67/100
88	85719	Tucson	AZ	45	69/100
89	85743	Tucson	AZ	44	52/100
90	85757	Tucson	AZ	43	69/100
91	86326	Cottonwood	AZ	43	69/100
92	85706	Tucson	AZ	42	68/100
93	85736	Tucson	AZ	42	70/100
94	85323	Avondale	AZ	41	54/100
95	85755	Tucson	AZ	41	69/100
96	86327	Dewey	AZ	41	69/100
97	85715	Tucson	AZ	39	71/100
98	85750	Tucson	AZ	39	71/100
99	85925	Eagar	AZ	39	67/100
100	86313	Prescott	AZ	38	53/100

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 Arizona — 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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