2026 Rankings

ZIP Codes with Most EPA Violations in Arizona — 2026

Last updated: June 4, 2026

461 ZIP codes ranked by Violations #1: ZIP 85701 (Tucson, AZ) — 218
Lead Violations Lowest Score Safest Flood Risk Energy Cost Radon PFAS Reliability EJ Index Homebuyer Risk CO & Gas Safest Gas Remediation Burden Unresolved Violations (by Utility) Water Equity (by Utility)

Out of 461 ZIP codes with data in Arizona, these are the highest-ranked areas for violations. See also: National ZIP Codes with Most EPA Water Violations | All Arizona Rankings

Statistic Value
ZIP codes ranked 461
Highest value 218
Median value 28
State Arizona

Top 100 Worst ZIP Codes

Rank ZIP Code City State Violations Safety Score
1 85701 Tucson AZ 218 58/100
2 85702 Tucson AZ 218 50/100
3 85703 Tucson AZ 218 50/100
4 85704 Tucson AZ 218 58/100
5 85705 Tucson AZ 218 53/100
6 85706 Tucson AZ 218 58/100
7 85707 Tucson AZ 218 50/100
8 85708 Tucson AZ 218 50/100
9 85709 Tucson AZ 218 50/100
10 85710 Tucson AZ 218 53/100
11 85711 Tucson AZ 218 58/100
12 85712 Tucson AZ 218 53/100
13 85713 Tucson AZ 218 58/100
14 85714 Tucson AZ 218 58/100
15 85715 Tucson AZ 218 53/100
16 85716 Tucson AZ 218 53/100
17 85717 Tucson AZ 218 50/100
18 85718 Tucson AZ 218 53/100
19 85719 Tucson AZ 218 53/100
20 85720 Tucson AZ 218 50/100
21 85721 Tucson AZ 218 50/100
22 85722 Tucson AZ 218 50/100
23 85723 Tucson AZ 218 50/100
24 85724 Tucson AZ 218 50/100
25 85725 Tucson AZ 218 50/100
26 85726 Tucson AZ 218 50/100
27 85728 Tucson AZ 218 50/100
28 85730 Tucson AZ 218 58/100
29 85731 Tucson AZ 218 50/100
30 85732 Tucson AZ 218 50/100
31 85733 Tucson AZ 218 50/100
32 85734 Tucson AZ 218 50/100
33 85735 Tucson AZ 218 53/100
34 85736 Tucson AZ 218 50/100
35 85737 Tucson AZ 218 53/100
36 85739 Tucson AZ 218 53/100
37 85740 Tucson AZ 218 50/100
38 85741 Tucson AZ 218 58/100
39 85742 Tucson AZ 218 53/100
40 85743 Tucson AZ 218 58/100
41 85744 Tucson AZ 218 50/100
42 85745 Tucson AZ 218 53/100
43 85746 Tucson AZ 218 58/100
44 85747 Tucson AZ 218 53/100
45 85748 Tucson AZ 218 58/100
46 85749 Tucson AZ 218 48/100
47 85750 Tucson AZ 218 53/100
48 85751 Tucson AZ 218 50/100
49 85752 Tucson AZ 218 50/100
50 85754 Tucson AZ 218 50/100
51 85755 Tucson AZ 218 58/100
52 85756 Tucson AZ 218 53/100
53 85757 Tucson AZ 218 53/100
54 85775 Tucson AZ 218 50/100
55 85356 Wellton AZ 140 53/100
56 85001 Phoenix AZ 126 58/100
57 85002 Phoenix AZ 126 50/100
58 85003 Phoenix AZ 126 58/100
59 85004 Phoenix AZ 126 58/100
60 85005 Phoenix AZ 126 58/100
61 85006 Phoenix AZ 126 58/100
62 85007 Phoenix AZ 126 53/100
63 85008 Phoenix AZ 126 48/100
64 85009 Phoenix AZ 126 53/100
65 85010 Phoenix AZ 126 50/100
66 85011 Phoenix AZ 126 50/100
67 85012 Phoenix AZ 126 53/100
68 85013 Phoenix AZ 126 48/100
69 85014 Phoenix AZ 126 48/100
70 85015 Phoenix AZ 126 48/100
71 85016 Phoenix AZ 126 48/100
72 85017 Phoenix AZ 126 53/100
73 85018 Phoenix AZ 126 48/100
74 85019 Phoenix AZ 126 53/100
75 85020 Phoenix AZ 126 48/100
76 85021 Phoenix AZ 126 48/100
77 85022 Phoenix AZ 126 53/100
78 85023 Phoenix AZ 126 53/100
79 85024 Phoenix AZ 126 50/100
80 85025 Phoenix AZ 126 50/100
81 85026 Phoenix AZ 126 50/100
82 85027 Phoenix AZ 126 58/100
83 85028 Phoenix AZ 126 58/100
84 85029 Phoenix AZ 126 53/100
85 85030 Phoenix AZ 126 58/100
86 85031 Phoenix AZ 126 48/100
87 85032 Phoenix AZ 126 53/100
88 85033 Phoenix AZ 126 53/100
89 85034 Phoenix AZ 126 53/100
90 85035 Phoenix AZ 126 58/100
91 85036 Phoenix AZ 126 58/100
92 85037 Phoenix AZ 126 58/100
93 85038 Phoenix AZ 126 50/100
94 85039 Phoenix AZ 126 50/100
95 85040 Phoenix AZ 126 58/100
96 85041 Phoenix AZ 126 53/100
97 85042 Phoenix AZ 126 58/100
98 85043 Phoenix AZ 126 58/100
99 85044 Phoenix AZ 126 58/100
100 85045 Phoenix AZ 126 50/100

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: 2026-06-04.

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.

Explore More Rankings

How this ranking is calculated, data sources, and limitations: Rankings Methodology →

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Disclaimer: Rankings are based on EPA, FEMA, and federal agency data. They reflect historical patterns and risk indicators, not necessarily current conditions. For the most current information, contact your local water utility or request a Consumer Confidence Report.

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