2026 Rankings

ZIP Codes with Most EPA Violations in Ohio — 2026

Last updated: October 15, 2026

741 ZIP codes ranked by Recorded EPA Violations #1: ZIP 43943 (Rayland, OH) - 58
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 741 ZIP codes with data in Ohio, these are the highest-ranked areas for recorded epa violations. See also: National ZIP Codes with Most EPA Water Violations | All Ohio Rankings

Statistic Value
ZIP codes ranked 741
Highest value 58
Median value 4
State Ohio

Top 100 Worst ZIP Codes

Rank ZIP Code City State Recorded EPA Violations Safety Score
1 43943 Rayland OH 58 —
2 43950 Saint Clairsville OH 55 33/100
3 43977 Flushing OH 41 50/100
4 43907 Cadiz OH 39 —
5 43917 Dillonvale OH 38 —
6 45140 Loveland OH 36 35/100
7 43137 Lockbourne OH 35 25/100
8 43830 Nashport OH 35 —
9 43912 Bridgeport OH 34 33/100
10 43935 Martins Ferry OH 34 33/100
11 43764 New Lexington OH 33 —
12 45769 Pomeroy OH 33 —
13 43718 Belmont OH 32 50/100
14 43777 Roseville OH 32 —
15 45150 Milford OH 31 53/100
16 43963 Tiltonsville OH 29 50/100
17 43971 Yorkville OH 29 —
18 45750 Marietta OH 27 50/100
19 44041 Geneva OH 26 67/100
20 45760 Middleport OH 26 —
21 45771 Racine OH 26 —
22 43701 Zanesville OH 25 —
23 43906 Bellaire OH 24 55/100
24 43140 London OH 23 50/100
25 44903 Mansfield OH 23 —
26 43746 Hopewell OH 22 —
27 43760 Mount Perry OH 22 —
28 43771 Philo OH 22 —
29 45601 Chillicothe OH 22 —
30 45764 Nelsonville OH 22 71/100
31 43901 Adena OH 21 —
32 43938 Mingo Junction OH 21 —
33 44084 Rock Creek OH 21 70/100
34 44085 Rome OH 21 70/100
35 45761 Millfield OH 21 72/100
36 43103 Ashville OH 20 —
37 43983 Piedmont OH 20 —
38 45732 Glouster OH 20 73/100
39 43055 Newark OH 19 58/100
40 43207 Columbus OH 19 25/100
41 43905 Barton OH 19 60/100
42 43944 Richmond OH 19 53/100
43 44807 Attica OH 19 —
44 45875 Ottawa OH 19 —
45 44606 Apple Creek OH 18 —
46 44624 Dundee OH 18 —
47 44662 Navarre OH 18 55/100
48 45716 Buchtel OH 18 —
49 43064 Plain City OH 17 42/100
50 43119 Galloway OH 17 28/100
51 43135 Laurelville OH 17 —
52 44044 Grafton OH 17 74/100
53 44090 Wellington OH 17 77/100
54 44240 Kent OH 17 58/100
55 44818 Bloomville OH 17 —
56 44882 Sycamore OH 17 —
57 44883 Tiffin OH 17 —
58 45107 Blanchester OH 17 38/100
59 45644 Kingston OH 17 —
60 43025 Hebron OH 16 56/100
61 43976 Hopedale OH 16 —
62 43986 Jewett OH 16 —
63 44627 Fredericksburg OH 16 —
64 44904 Mansfield OH 16 —
65 44905 Mansfield OH 16 —
66 45011 Hamilton OH 16 33/100
67 45106 Bethel OH 16 55/100
68 45385 Xenia OH 16 54/100
69 45690 Waverly OH 16 —
70 43512 Defiance OH 15 —
71 43526 Hicksville OH 15 —
72 43545 Napoleon OH 15 —
73 43724 Caldwell OH 15 52/100
74 44224 Stow OH 15 56/100
75 44618 Dalton OH 15 —
76 44813 Bellville OH 15 —
77 45036 Lebanon OH 15 43/100
78 45121 Georgetown OH 15 —
79 45344 New Carlisle OH 15 56/100
80 45638 Ironton OH 15 53/100
81 43008 Buckeye Lake OH 14 —
82 43023 Granville OH 14 61/100
83 44050 Lagrange OH 14 77/100
84 44333 Akron OH 14 39/100
85 44667 Orrville OH 14 —
86 45144 Manchester OH 14 —
87 45613 Beaver OH 14 —
88 45648 Lucasville OH 14 —
89 43146 Orient OH 13 —
90 44253 Litchfield OH 13 76/100
91 45040 Mason OH 13 45/100
92 45152 Morrow OH 13 40/100
93 45634 Hamden OH 13 —
94 45651 Mc Arthur OH 13 —
95 45661 Piketon OH 13 —
96 43311 Bellefontaine OH 12 —
97 43430 Genoa OH 12 —
98 43527 Holgate OH 12 —
99 43548 New Bavaria OH 12 —

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: 2026-10-15.

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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