2026 Rankings

ZIP Codes with Most EPA Violations in Maryland — 2026

Last updated: June 4, 2026

196 ZIP codes ranked by Violations #1: ZIP 20664 (Newburg, MD) — 22
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 196 ZIP codes with data in Maryland, these are the highest-ranked areas for violations. See also: National ZIP Codes with Most EPA Water Violations | All Maryland Rankings

Statistic Value
ZIP codes ranked 196
Highest value 22
Median value 5
State Maryland

Top 100 Worst ZIP Codes

Rank ZIP Code City State Violations Safety Score
1 20664 Newburg MD 22 72/100
2 21639 Greensboro MD 21 89/100
3 21866 Tylerton MD 18 67/100
4 21903 Perryville MD 15 59/100
5 21901 North East MD 13 59/100
6 21201 Baltimore MD 11 68/100
7 21202 Baltimore MD 11 63/100
8 21203 Baltimore MD 11 93/100
9 21205 Baltimore MD 11 68/100
10 21206 Baltimore MD 11 63/100
11 21209 Baltimore MD 11 58/100
12 21210 Baltimore MD 11 63/100
13 21211 Baltimore MD 11 58/100
14 21212 Baltimore MD 11 63/100
15 21213 Baltimore MD 11 63/100
16 21214 Baltimore MD 11 63/100
17 21215 Baltimore MD 11 58/100
18 21216 Baltimore MD 11 63/100
19 21217 Baltimore MD 11 68/100
20 21218 Baltimore MD 11 63/100
21 21223 Baltimore MD 11 63/100
22 21224 Baltimore MD 11 63/100
23 21229 Baltimore MD 11 58/100
24 21230 Baltimore MD 11 58/100
25 21231 Baltimore MD 11 58/100
26 21233 Baltimore MD 11 64/100
27 21235 Baltimore MD 11 64/100
28 21239 Baltimore MD 11 63/100
29 21240 Baltimore MD 11 81/100
30 21241 Baltimore MD 11 64/100
31 21250 Baltimore MD 11 64/100
32 21251 Baltimore MD 11 64/100
33 21260 Baltimore MD 11 64/100
34 21263 Baltimore MD 11 64/100
35 21264 Baltimore MD 11 64/100
36 21265 Baltimore MD 11 64/100
37 21268 Baltimore MD 11 64/100
38 21270 Baltimore MD 11 64/100
39 21273 Baltimore MD 11 64/100
40 21274 Baltimore MD 11 64/100
41 21275 Baltimore MD 11 64/100
42 21278 Baltimore MD 11 64/100
43 21279 Baltimore MD 11 64/100
44 21280 Baltimore MD 11 64/100
45 21281 Baltimore MD 11 64/100
46 21282 Baltimore MD 11 64/100
47 21283 Baltimore MD 11 64/100
48 21284 Baltimore MD 11 64/100
49 21285 Baltimore MD 11 64/100
50 21287 Baltimore MD 11 64/100
51 21288 Baltimore MD 11 64/100
52 21289 Baltimore MD 11 64/100
53 21290 Baltimore MD 11 64/100
54 21297 Baltimore MD 11 64/100
55 21298 Baltimore MD 11 68/100
56 21842 Ocean City MD 11 73/100
57 21843 Ocean City MD 11 93/100
58 21619 Chester MD 9 80/100
59 21624 Claiborne MD 9 93/100
60 21632 Federalsburg MD 9 88/100
61 21904 Port Deposit MD 9 66/100
62 21034 Darlington MD 8 62/100
63 21057 Glen Arm MD 8 68/100
64 21784 Sykesville MD 8 57/100
65 20639 Huntingtown MD 7 50/100
66 20871 Clarksburg MD 7 64/100
67 21078 Havre De Grace MD 7 56/100
68 21771 Mount Airy MD 7 69/100
69 21913 Cecilton MD 7 56/100
70 21921 Elkton MD 7 66/100
71 21922 Elkton MD 7 76/100
72 20650 Leonardtown MD 6 70/100
73 20794 Jessup MD 6 59/100
74 21044 Columbia MD 6 62/100
75 21045 Columbia MD 6 62/100
76 21046 Columbia MD 6 62/100
77 21629 Denton MD 6 94/100
78 21658 Queenstown MD 6 76/100
79 21795 Williamsport MD 6 59/100
80 21798 Woodsboro MD 6 64/100
81 21851 Pocomoke City MD 6 86/100
82 21917 Colora MD 6 53/100
83 20619 California MD 5 53/100
84 20622 Charlotte Hall MD 5 82/100
85 20657 Lusby MD 5 51/100
86 20658 Marbury MD 5 71/100
87 21041 Ellicott City MD 5 69/100
88 21042 Ellicott City MD 5 59/100
89 21043 Ellicott City MD 5 54/100
90 21053 Freeland MD 5 57/100
91 21108 Millersville MD 5 74/100
92 21157 Westminster MD 5 64/100
93 21158 Westminster MD 5 69/100
94 21539 Lonaconing MD 5 75/100
95 21562 Westernport MD 5 63/100
96 21617 Centreville MD 5 89/100
97 21660 Ridgely MD 5 93/100
98 21666 Stevensville MD 5 68/100
99 21682 Ridgely MD 5 97/100
100 21683 Ridgely MD 5 97/100

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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