ZIP Codes with Most EPA Water Violations

Out of 17,874 ZIP codes with data across all 50 states, these are the highest-ranked areas for recorded epa violations. Each ZIP links to a full safety report with water quality, lead, radon, and flood data.

Statistic	Value
ZIP codes ranked	17,874
Highest value	1,204
Median value	7

Top 100 Worst ZIP Codes

Rank	ZIP Code	City	State	Recorded EPA Violations	Safety Score
1	18322	Brodheadsville	PA	1,204	—
2	19460	Phoenixville	PA	983	33/100
3	19403	Norristown	PA	941	33/100
4	86426	Fort Mohave	AZ	892	67/100
5	19426	Collegeville	PA	881	33/100
6	86429	Bullhead City	AZ	862	50/100
7	86442	Bullhead City	AZ	842	50/100
8	74873	Tecumseh	OK	790	—
9	74331	Afton	OK	782	—
10	73010	Blanchard	OK	677	83/100
11	74079	Stroud	OK	658	—
12	74038	Jennings	OK	654	—
13	74052	Oilton	OK	605	—
14	74855	Meeker	OK	598	—
15	74864	Prague	OK	594	—
16	26763	Springfield	WV	592	—
17	74869	Sparks	OK	586	—
18	26726	Keyser	WV	581	—
19	26753	Ridgeley	WV	539	—
20	26767	Wiley Ford	WV	539	—
21	85365	Yuma	AZ	515	67/100
22	73089	Tuttle	OK	482	—
23	99567	Chugiak	AK	479	67/100
24	99577	Eagle River	AK	479	67/100
25	77357	New Caney	TX	474	75/100
26	07828	Budd Lake	NJ	472	33/100
27	79118	Amarillo	TX	465	67/100
28	26719	Fort Ashby	WV	456	—
29	77372	Splendora	TX	425	—
30	07836	Flanders	NJ	414	33/100
31	07840	Hackettstown	NJ	389	33/100
32	77090	Houston	TX	374	75/100
33	74035	Hominy	OK	365	—
34	97390	Tidewater	OR	345	—
35	97394	Waldport	OR	345	—
36	77662	Vidor	TX	342	83/100
37	07853	Long Valley	NJ	339	33/100
38	78112	Elmendorf	TX	334	75/100
39	79382	Wolfforth	TX	329	67/100
40	18041	East Greenville	PA	314	33/100
41	74501	Mcalester	OK	312	83/100
42	76048	Granbury	TX	310	83/100
43	18073	Pennsburg	PA	308	33/100
44	26554	Fairmont	WV	306	67/100
45	18076	Red Hill	PA	305	33/100
46	26175	Sistersville	WV	305	—
47	73020	Choctaw	OK	290	75/100
48	27603	Raleigh	NC	279	50/100
49	75766	Jacksonville	TX	279	—
50	85298	Gilbert	AZ	278	42/100
51	79706	Midland	TX	277	—
52	06804	Brookfield	CT	275	33/100
53	18974	Warminster	PA	273	33/100
54	76705	Waco	TX	273	75/100
55	97376	Seal Rock	OR	272	—
56	77351	Livingston	TX	270	67/100
57	85249	Chandler	AZ	269	58/100
58	17740	Jersey Shore	PA	266	50/100
59	73084	Spencer	OK	266	75/100
60	74849	Konawa	OK	263	—
61	17702	Williamsport	PA	261	33/100
62	33309	Fort Lauderdale	FL	258	67/100
63	74422	Boynton	OK	257	—
64	75862	Trinity	TX	257	—
65	18436	Lake Ariel	PA	255	50/100
66	74884	Wewoka	OK	254	—
67	12564	Pawling	NY	251	—
68	18951	Quakertown	PA	250	33/100
69	33844	Haines City	FL	246	67/100
70	19504	Barto	PA	245	—
71	74434	Fort Gibson	OK	245	—
72	24801	Welch	WV	244	—
73	15531	Boswell	PA	242	67/100
74	25276	Spencer	WV	241	—
75	77060	Houston	TX	240	75/100
76	25661	Williamson	WV	239	—
77	85367	Yuma	AZ	236	67/100
78	85635	Sierra Vista	AZ	229	67/100
79	76825	Brady	TX	227	—
80	85650	Sierra Vista	AZ	227	67/100
81	11576	Roslyn	NY	226	67/100
82	15946	Portage	PA	226	67/100
83	11030	Manhasset	NY	225	67/100
84	11507	Albertson	NY	225	67/100
85	11577	Roslyn Heights	NY	225	67/100
86	74525	Atoka	OK	225	—
87	74352	Locust Grove	OK	224	50/100
88	85615	Hereford	AZ	223	—
89	25670	Delbarton	WV	219	—
90	33068	Pompano Beach	FL	219	67/100
91	73044	Guthrie	OK	219	—
92	33311	Fort Lauderdale	FL	218	67/100
93	73647	Foss	OK	218	—
94	75974	Tenaha	TX	218	—
95	73717	Alva	OK	216	—
96	97338	Dallas	OR	216	—
97	74421	Beggs	OK	215	—
98	76642	Groesbeck	TX	215	—
99	85142	Queen Creek	AZ	215	42/100
100	97361	Monmouth	OR	215	—

Rankings by State

State	ZIP Codes Ranked
Texas	1,461
Pennsylvania	1,180
Florida	844
Illinois	826
Missouri	742
Ohio	741
New York	720
North Carolina	643
California	622
Michigan	551
Oklahoma	512
Georgia	511
Tennessee	495
Kentucky	482
West Virginia	479
New Jersey	478
Alabama	455
Indiana	427
Arkansas	383
Wisconsin	372
Mississippi	361
Kansas	361
Louisiana	323
Virginia	322
Washington	311
Arizona	288
Colorado	262
Maryland	251
Minnesota	251
South Carolina	251
Massachusetts	244
Oregon	226
Connecticut	173
Iowa	171
Utah	163
New Mexico	132
Maine	130
Vermont	114
South Dakota	88
Idaho	86
New Hampshire	68
Nebraska	68
Rhode Island	59
Montana	54
North Dakota	39
Wyoming	36
District of Columbia	36
Nevada	31
Delaware	25
Alaska	17
Hawaii	9

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 Water Violations — 2026 Rank...