2026 Rankings

ZIP Codes with Most EPA Violations in Colorado — 2026

Last updated: June 4, 2026

484 ZIP codes ranked by Violations #1: ZIP 81419 (Hotchkiss, CO) — 92
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 484 ZIP codes with data in Colorado, these are the highest-ranked areas for violations. See also: National ZIP Codes with Most EPA Water Violations | All Colorado Rankings

Statistic Value
ZIP codes ranked 484
Highest value 92
Median value 5
State Colorado

Top 100 Worst ZIP Codes

Rank ZIP Code City State Violations Safety Score
1 81419 Hotchkiss CO 92 57/100
2 81058 Manzanola CO 88 33/100
3 81030 Cheraw CO 83 33/100
4 80816 Florissant CO 82 66/100
5 81067 Rocky Ford CO 51 45/100
6 81435 Telluride CO 51 59/100
7 80477 Steamboat Springs CO 50 72/100
8 80487 Steamboat Springs CO 50 67/100
9 80488 Steamboat Springs CO 50 69/100
10 81047 Holly CO 47 33/100
11 80437 Evergreen CO 45 52/100
12 80439 Evergreen CO 45 42/100
13 81023 Beulah CO 45 45/100
14 80511 Estes Park CO 44 59/100
15 80517 Estes Park CO 44 54/100
16 81089 Walsenburg CO 43 44/100
17 81429 Paradox CO 43 49/100
18 81019 Colorado City CO 41 57/100
19 80467 Oak Creek CO 40 68/100
20 81428 Paonia CO 39 58/100
21 81069 Rye CO 36 40/100
22 81201 Salida CO 33 69/100
23 81144 Monte Vista CO 32 73/100
24 81426 Ophir CO 32 54/100
25 80133 Palmer Lake CO 31 66/100
26 80621 Fort Lupton CO 31 61/100
27 81055 La Veta CO 31 53/100
28 81430 Placerville CO 31 65/100
29 81092 Wiley CO 30 45/100
30 81041 Granada CO 29 50/100
31 80540 Lyons CO 28 35/100
32 81084 Two Buttes CO 28 47/100
33 81652 Silt CO 28 64/100
34 80136 Strasburg CO 27 63/100
35 80860 Victor CO 27 56/100
36 81424 Nucla CO 27 60/100
37 80461 Leadville CO 26 56/100
38 81071 Sheridan Lake CO 24 62/100
39 81045 Haswell CO 23 61/100
40 80818 Genoa CO 22 46/100
41 81432 Ridgway CO 22 41/100
42 80482 Winter Park CO 21 69/100
43 80654 Wiggins CO 21 57/100
44 81050 La Junta CO 21 35/100
45 81601 Glenwood Springs CO 21 55/100
46 81602 Glenwood Springs CO 21 60/100
47 80443 Frisco CO 20 69/100
48 80814 Divide CO 20 60/100
49 81101 Alamosa CO 20 67/100
50 81102 Alamosa CO 20 72/100
51 81137 Ignacio CO 20 62/100
52 81641 Meeker CO 20 68/100
53 81656 Woody Creek CO 20 57/100
54 80421 Bailey CO 19 69/100
55 80536 Livermore CO 19 34/100
56 81654 Snowmass CO 19 56/100
57 80727 Eckley CO 18 61/100
58 80827 Lake George CO 18 64/100
59 81124 Capulin CO 18 82/100
60 81328 Mancos CO 18 56/100
61 80101 Agate CO 17 64/100
62 80118 Larkspur CO 17 60/100
63 80459 Kremmling CO 17 65/100
64 80747 Peetz CO 17 51/100
65 81082 Trinidad CO 17 69/100
66 81226 Florence CO 17 66/100
67 81290 Florence CO 17 61/100
68 81422 Naturita CO 17 66/100
69 81650 Rifle CO 17 61/100
70 80440 Fairplay CO 16 64/100
71 81044 Hasty CO 16 37/100
72 81120 Antonito CO 16 72/100
73 81324 Dove Creek CO 16 47/100
74 80427 Central City CO 15 61/100
75 80545 Red Feather Lakes CO 15 61/100
76 81321 Cortez CO 15 66/100
77 81623 Carbondale CO 15 68/100
78 80424 Breckenridge CO 14 68/100
79 80446 Granby CO 14 63/100
80 80510 Allenspark CO 14 51/100
81 80549 Wellington CO 14 63/100
82 81090 Walsh CO 14 34/100
83 81427 Ouray CO 14 69/100
84 81434 Somerset CO 14 67/100
85 80110 Englewood CO 13 69/100
86 80111 Englewood CO 13 64/100
87 80112 Englewood CO 13 64/100
88 80113 Englewood CO 13 64/100
89 80135 Sedalia CO 13 64/100
90 80150 Englewood CO 13 65/100
91 80151 Englewood CO 13 65/100
92 80155 Englewood CO 13 65/100
93 80455 Jamestown CO 13 59/100
94 80743 Otis CO 13 65/100
95 80817 Fountain CO 13 64/100
96 81147 Pagosa Springs CO 13 77/100
97 81157 Pagosa Springs CO 13 77/100
98 81413 Cedaredge CO 13 59/100
99 81639 Hayden CO 13 77/100
100 80010 Aurora CO 12 51/100

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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