2026 Rankings

ZIP Codes with Most EPA Violations in Minnesota — 2026

Last updated: June 4, 2026

351 ZIP codes ranked by Violations #1: ZIP 56735 (Lancaster, MN) — 30
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 351 ZIP codes with data in Minnesota, these are the highest-ranked areas for violations. See also: National ZIP Codes with Most EPA Water Violations | All Minnesota Rankings

Statistic Value
ZIP codes ranked 351
Highest value 30
Median value 1
State Minnesota

Top 100 Worst ZIP Codes

Rank ZIP Code City State Violations Safety Score
1 56735 Lancaster MN 30 37/100
2 56253 Lake Lillian MN 19 45/100
3 56267 Morris MN 19 45/100
4 56572 Pelican Rapids MN 19 40/100
5 56501 Detroit Lakes MN 17 40/100
6 56502 Detroit Lakes MN 17 45/100
7 56216 Blomkest MN 16 51/100
8 55335 Gibbon MN 15 33/100
9 56525 Comstock MN 13 69/100
10 55087 Warsaw MN 12 61/100
11 56523 Climax MN 12 59/100
12 55073 Scandia MN 11 60/100
13 56537 Fergus Falls MN 11 38/100
14 56538 Fergus Falls MN 11 38/100
15 56667 Puposky MN 11 71/100
16 55065 Randolph MN 9 54/100
17 56601 Bemidji MN 8 75/100
18 56619 Bemidji MN 8 75/100
19 56310 Avon MN 7 61/100
20 56756 Salol MN 7 47/100
21 55362 Monticello MN 6 69/100
22 55365 Monticello MN 6 65/100
23 55561 Monticello MN 6 65/100
24 55563 Monticello MN 6 65/100
25 55565 Monticello MN 6 65/100
26 55580 Monticello MN 6 65/100
27 55581 Monticello MN 6 65/100
28 55582 Monticello MN 6 65/100
29 55584 Monticello MN 6 65/100
30 55585 Monticello MN 6 65/100
31 55586 Monticello MN 6 65/100
32 55587 Monticello MN 6 65/100
33 55588 Monticello MN 6 65/100
34 55589 Monticello MN 6 65/100
35 55590 Monticello MN 6 65/100
36 55591 Monticello MN 6 65/100
37 55965 Preston MN 6 62/100
38 56073 New Ulm MN 6 62/100
39 55045 Lindstrom MN 5 76/100
40 55069 Rush City MN 5 75/100
41 55731 Ely MN 5 78/100
42 55746 Hibbing MN 5 53/100
43 55747 Hibbing MN 5 45/100
44 55953 Lyle MN 5 54/100
45 55987 Winona MN 5 57/100
46 56026 Ellendale MN 5 65/100
47 56111 Alpha MN 5 65/100
48 56274 Norcross MN 5 66/100
49 56342 Isle MN 5 79/100
50 56550 Hendrum MN 5 53/100
51 56701 Thief River Falls MN 5 56/100
52 56763 Warroad MN 5 68/100
53 55019 Dundas MN 4 67/100
54 55044 Lakeville MN 4 63/100
55 55052 Morristown MN 4 63/100
56 55076 Inver Grove Heights MN 4 58/100
57 55077 Inver Grove Heights MN 4 58/100
58 55323 Crystal Bay MN 4 47/100
59 55332 Fairfax MN 4 68/100
60 55382 South Haven MN 4 57/100
61 55385 Stewart MN 4 51/100
62 55601 Beaver Bay MN 4 52/100
63 55704 Askov MN 4 81/100
64 55707 Barnum MN 4 72/100
65 55734 Eveleth MN 4 79/100
66 55912 Austin MN 4 53/100
67 55924 Claremont MN 4 67/100
68 55959 Minnesota City MN 4 65/100
69 55982 Waltham MN 4 53/100
70 56045 Hollandale MN 4 60/100
71 56228 Cosmos MN 4 61/100
72 56349 Lowry MN 4 63/100
73 56358 Ogilvie MN 4 64/100
74 56516 Bejou MN 4 52/100
75 56519 Borup MN 4 67/100
76 56583 Tintah MN 4 65/100
77 56672 Remer MN 4 81/100
78 56714 Badger MN 4 64/100
79 55018 Dennison MN 3 66/100
80 55604 Grand Marais MN 3 66/100
81 55614 Silver Bay MN 3 69/100
82 55901 Rochester MN 3 54/100
83 55902 Rochester MN 3 54/100
84 55903 Rochester MN 3 64/100
85 55904 Rochester MN 3 49/100
86 55905 Rochester MN 3 58/100
87 55906 Rochester MN 3 54/100
88 56001 Mankato MN 3 59/100
89 56002 Mankato MN 3 69/100
90 56003 Mankato MN 3 64/100
91 56006 Mankato MN 3 65/100
92 56009 Alden MN 3 42/100
93 56042 Hartland MN 3 65/100
94 56054 Lafayette MN 3 55/100
95 56161 Okabena MN 3 67/100
96 56172 Slayton MN 3 69/100
97 56173 Steen MN 3 51/100
98 56223 Clarkfield MN 3 69/100
99 56278 Ortonville MN 3 59/100
100 56293 Wabasso MN 3 69/100

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 →

Related Rankings

Home Safety 2026 Combined water, lead, radon and environmental risk PFAS 2026 Forever chemicals detected in drinking water Lead Risk 2026 Lead pipe infrastructure and EPA exceedances
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.

Get safety alerts for Minnesota

Free updates when EPA data changes for this area. No spam.

Unsubscribe anytime. Privacy Policy.

Share This Page

X Facebook
Check your water filter options Free tool — no phone call required.