ZIP Codes with Most EPA Violations in Ohio

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	43791	White Cottage	OH	21	—
32	43901	Adena	OH	21	—
33	43938	Mingo Junction	OH	21	—
34	44084	Rock Creek	OH	21	70/100
35	44085	Rome	OH	21	70/100
36	45761	Millfield	OH	21	72/100
37	43103	Ashville	OH	20	—
38	43983	Piedmont	OH	20	—
39	45732	Glouster	OH	20	73/100
40	43055	Newark	OH	19	58/100
41	43207	Columbus	OH	19	25/100
42	43905	Barton	OH	19	60/100
43	43944	Richmond	OH	19	53/100
44	44807	Attica	OH	19	—
45	45875	Ottawa	OH	19	—
46	44606	Apple Creek	OH	18	—
47	44624	Dundee	OH	18	—
48	44662	Navarre	OH	18	55/100
49	45716	Buchtel	OH	18	—
50	43064	Plain City	OH	17	42/100
51	43119	Galloway	OH	17	28/100
52	43135	Laurelville	OH	17	—
53	44044	Grafton	OH	17	74/100
54	44090	Wellington	OH	17	77/100
55	44240	Kent	OH	17	58/100
56	44818	Bloomville	OH	17	—
57	44882	Sycamore	OH	17	—
58	44883	Tiffin	OH	17	—
59	45107	Blanchester	OH	17	38/100
60	45644	Kingston	OH	17	—
61	43025	Hebron	OH	16	56/100
62	43976	Hopedale	OH	16	—
63	43986	Jewett	OH	16	—
64	44627	Fredericksburg	OH	16	—
65	44904	Mansfield	OH	16	—
66	44905	Mansfield	OH	16	—
67	45011	Hamilton	OH	16	33/100
68	45106	Bethel	OH	16	55/100
69	45385	Xenia	OH	16	54/100
70	45690	Waverly	OH	16	—
71	43512	Defiance	OH	15	—
72	43526	Hicksville	OH	15	—
73	43545	Napoleon	OH	15	—
74	43724	Caldwell	OH	15	52/100
75	44224	Stow	OH	15	56/100
76	44618	Dalton	OH	15	—
77	44813	Bellville	OH	15	—
78	45036	Lebanon	OH	15	43/100
79	45121	Georgetown	OH	15	—
80	45344	New Carlisle	OH	15	56/100
81	45638	Ironton	OH	15	53/100
82	43008	Buckeye Lake	OH	14	—
83	43023	Granville	OH	14	61/100
84	44050	Lagrange	OH	14	77/100
85	44333	Akron	OH	14	39/100
86	44667	Orrville	OH	14	—
87	45144	Manchester	OH	14	—
88	45613	Beaver	OH	14	—
89	45648	Lucasville	OH	14	—
90	43146	Orient	OH	13	—
91	44253	Litchfield	OH	13	76/100
92	45040	Mason	OH	13	45/100
93	45152	Morrow	OH	13	40/100
94	45634	Hamden	OH	13	—
95	45651	Mc Arthur	OH	13	—
96	45661	Piketon	OH	13	—
97	43311	Bellefontaine	OH	12	—
98	43430	Genoa	OH	12	—
99	43527	Holgate	OH	12	—
100	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: 2026-08-31.

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 Ohio — 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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