2026 Rankings

ZIP Codes with Most EPA Violations in Colorado — 2026

Last updated: August 31, 2026

262 ZIP codes ranked by Recorded EPA Violations #1: ZIP 80906 (Colorado Springs, CO) - 180
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 262 ZIP codes with data in Colorado, these are the highest-ranked areas for recorded epa violations. See also: National ZIP Codes with Most EPA Water Violations | All Colorado Rankings

Statistic Value
ZIP codes ranked 262
Highest value 180
Median value 16
State Colorado

Top 100 Worst ZIP Codes

Rank ZIP Code City State Recorded EPA Violations Safety Score
1 80906 Colorado Springs CO 180 50/100
2 81435 Telluride CO 172 33/100
3 80816 Florissant CO 141 —
4 81426 Ophir CO 134 —
5 80439 Evergreen CO 113 50/100
6 81101 Alamosa CO 108 67/100
7 80461 Leadville CO 106 —
8 80517 Estes Park CO 99 50/100
9 80817 Fountain CO 84 33/100
10 80908 Colorado Springs CO 83 50/100
11 80301 Boulder CO 82 50/100
12 80910 Colorado Springs CO 82 50/100
13 80537 Loveland CO 71 33/100
14 80831 Peyton CO 71 50/100
15 81004 Pueblo CO 66 50/100
16 81019 Colorado City CO 66 —
17 81023 Beulah CO 66 —
18 81069 Rye CO 66 —
19 80524 Fort Collins CO 65 50/100
20 80903 Colorado Springs CO 64 50/100
21 80621 Fort Lupton CO 60 42/100
22 80487 Steamboat Springs CO 57 67/100
23 81520 Clifton CO 57 58/100
24 81526 Palisade CO 57 58/100
25 80465 Morrison CO 55 50/100
26 80926 Colorado Springs CO 55 50/100
27 80863 Woodland Park CO 54 —
28 80401 Golden CO 49 50/100
29 80118 Larkspur CO 47 50/100
30 80221 Denver CO 46 45/100
31 81650 Rifle CO 46 61/100
32 81652 Silt CO 46 —
33 80135 Sedalia CO 45 —
34 80216 Denver CO 43 63/100
35 80540 Lyons CO 43 —
36 80260 Denver CO 42 33/100
37 80110 Englewood CO 40 63/100
38 80123 Littleton CO 40 63/100
39 80210 Denver CO 40 63/100
40 80219 Denver CO 40 63/100
41 80223 Denver CO 40 63/100
42 80236 Denver CO 40 63/100
43 81625 Craig CO 39 —
44 80433 Conifer CO 37 —
45 81001 Pueblo CO 37 53/100
46 81006 Pueblo CO 37 53/100
47 80226 Denver CO 35 65/100
48 80227 Denver CO 35 65/100
49 80232 Denver CO 35 65/100
50 80246 Denver CO 35 65/100
51 80538 Loveland CO 35 38/100
52 80012 Aurora CO 34 66/100
53 80014 Aurora CO 34 66/100
54 80019 Aurora CO 34 66/100
55 80132 Monument CO 34 52/100
56 80202 Denver CO 34 66/100
57 80203 Denver CO 34 66/100
58 80204 Denver CO 34 66/100
59 80205 Denver CO 34 66/100
60 80206 Denver CO 34 66/100
61 80207 Denver CO 34 66/100
62 80209 Denver CO 34 66/100
63 80211 Denver CO 34 66/100
64 80212 Denver CO 34 66/100
65 80214 Denver CO 34 66/100
66 80218 Denver CO 34 66/100
67 80220 Denver CO 34 66/100
68 80222 Denver CO 34 66/100
69 80224 Denver CO 34 66/100
70 80230 Denver CO 34 66/100
71 80231 Denver CO 34 66/100
72 80235 Denver CO 34 66/100
73 80237 Denver CO 34 66/100
74 80238 Denver CO 34 66/100
75 80239 Denver CO 34 66/100
76 80247 Denver CO 34 66/100
77 80249 Denver CO 34 66/100
78 80264 Denver CO 34 66/100
79 80266 Denver CO 34 —
80 80290 Denver CO 34 —
81 80294 Denver CO 34 66/100
82 80127 Littleton CO 33 53/100
83 80016 Aurora CO 32 39/100
84 80921 Colorado Springs CO 31 54/100
85 81050 La Junta CO 31 —
86 81089 Walsenburg CO 30 —
87 81637 Gypsum CO 30 —
88 80125 Littleton CO 28 64/100
89 80550 Windsor CO 28 31/100
90 80615 Eaton CO 28 49/100
91 81226 Florence CO 28 55/100
92 80134 Parker CO 27 41/100
93 80535 Laporte CO 27 57/100
94 81419 Hotchkiss CO 27 55/100
95 81631 Eagle CO 27 —
96 80108 Castle Rock CO 26 41/100
97 80645 La Salle CO 26 49/100
98 80549 Wellington CO 25 57/100
99 80026 Lafayette CO 24 51/100
100 80525 Fort Collins CO 23 58/100

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: 2026-08-31.

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.

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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