2026 Rankings

ZIP Codes with Most EPA Violations in Oklahoma — 2026

Last updated: June 4, 2026

633 ZIP codes ranked by Violations #1: ZIP 74035 (Hominy, OK) — 186
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 633 ZIP codes with data in Oklahoma, these are the highest-ranked areas for violations. See also: National ZIP Codes with Most EPA Water Violations | All Oklahoma Rankings

Statistic Value
ZIP codes ranked 633
Highest value 186
Median value 8
State Oklahoma

Top 100 Worst ZIP Codes

Rank ZIP Code City State Violations Safety Score
1 74035 Hominy OK 186 62/100
2 74884 Wewoka OK 134 70/100
3 73077 Perry OK 106 68/100
4 74652 Shidler OK 103 55/100
5 74467 Wagoner OK 100 65/100
6 74477 Wagoner OK 100 66/100
7 74027 Delaware OK 99 75/100
8 74002 Barnsdall OK 98 68/100
9 74966 Wister OK 97 66/100
10 74643 Lamont OK 96 87/100
11 74851 Mcloud OK 90 88/100
12 74060 Prue OK 85 94/100
13 74054 Osage OK 84 86/100
14 73401 Ardmore OK 81 65/100
15 73402 Ardmore OK 81 66/100
16 73403 Ardmore OK 81 66/100
17 73451 Ardmore OK 81 66/100
18 73454 Ardmore OK 81 66/100
19 74451 Park Hill OK 76 69/100
20 74727 Boswell OK 70 66/100
21 74651 Red Rock OK 69 66/100
22 73057 Maysville OK 67 62/100
23 74873 Tecumseh OK 67 40/100
24 74553 Kiowa OK 64 70/100
25 74637 Fairfax OK 64 70/100
26 74422 Boynton OK 63 55/100
27 74058 Pawnee OK 62 70/100
28 74427 Cookson OK 60 54/100
29 74352 Locust Grove OK 59 71/100
30 74344 Grove OK 58 61/100
31 74345 Grove OK 58 62/100
32 74022 Copan OK 56 68/100
33 74525 Atoka OK 56 70/100
34 74542 Atoka OK 56 66/100
35 73521 Altus OK 55 70/100
36 73522 Altus OK 55 65/100
37 74536 Clayton OK 53 37/100
38 73857 Sharon OK 51 61/100
39 74421 Beggs OK 51 70/100
40 74965 Westville OK 51 61/100
41 73753 Kremlin OK 50 70/100
42 74426 Checotah OK 50 70/100
43 73570 Tipton OK 49 70/100
44 74020 Cleveland OK 49 70/100
45 74848 Holdenville OK 49 70/100
46 74061 Ramona OK 47 71/100
47 74048 Nowata OK 46 65/100
48 74432 Eufaula OK 45 70/100
49 73011 Bradley OK 44 83/100
50 73737 Fairview OK 44 65/100
51 74959 Spiro OK 44 59/100
52 73762 Okarche OK 43 64/100
53 74001 Avant OK 43 70/100
54 74003 Bartlesville OK 43 60/100
55 74004 Bartlesville OK 43 66/100
56 74005 Bartlesville OK 43 66/100
57 74006 Bartlesville OK 43 55/100
58 74962 Vian OK 43 67/100
59 73568 Temple OK 42 66/100
60 74571 Talihina OK 42 70/100
61 74029 Dewey OK 39 65/100
62 74501 Mcalester OK 39 65/100
63 74502 Mcalester OK 39 66/100
64 74878 Wanette OK 38 53/100
65 73834 Buffalo OK 37 81/100
66 74875 Tryon OK 37 57/100
67 74953 Poteau OK 37 65/100
68 74630 Billings OK 36 73/100
69 73552 Indiahoma OK 35 65/100
70 74401 Muskogee OK 35 69/100
71 74402 Muskogee OK 35 65/100
72 74403 Muskogee OK 35 59/100
73 73004 Amber OK 34 55/100
74 73089 Tuttle OK 34 85/100
75 73096 Weatherford OK 34 83/100
76 73726 Carmen OK 34 83/100
77 73844 Gate OK 34 67/100
78 74523 Antlers OK 34 70/100
79 74331 Afton OK 33 53/100
80 74445 Morris OK 33 70/100
81 74447 Okmulgee OK 33 65/100
82 74561 Quinton OK 33 62/100
83 74563 Red Oak OK 33 70/100
84 73019 Norman OK 32 87/100
85 73026 Norman OK 32 80/100
86 73069 Norman OK 32 80/100
87 73070 Norman OK 32 85/100
88 73071 Norman OK 32 80/100
89 73072 Norman OK 32 75/100
90 73546 Grandfield OK 32 55/100
91 73628 Cheyenne OK 32 62/100
92 73040 Geary OK 31 76/100
93 73573 Waurika OK 31 62/100
94 74363 Quapaw OK 31 79/100
95 74370 Wyandotte OK 31 82/100
96 74636 Deer Creek OK 31 66/100
97 74647 Newkirk OK 30 83/100
98 74883 Wetumka OK 30 51/100
99 73446 Madill OK 29 70/100
100 73550 Hollis OK 29 65/100

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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