2026 Rankings

Worst ZIP Codes for Lead in Water in Colorado — 2026

Last updated: June 4, 2026

547 ZIP codes ranked by Lead (mg/L) #1: ZIP 80746 (Paoli, CO) — 70.0 ppb
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 547 ZIP codes with data in Colorado, these are the highest-ranked areas for lead (mg/l). See also: National Worst ZIP Codes for Lead in Water | All Colorado Rankings

Statistic Value
ZIP codes ranked 547
Highest value 70.0 ppb
Median value 2.7 ppb
State Colorado

Top 100 Worst ZIP Codes

Rank ZIP Code City State Lead (mg/L) Safety Score
1 80746 Paoli CO 70.0 ppb 31/100
2 81432 Ridgway CO 15.8 ppb 41/100
3 80536 Livermore CO 13.8 ppb 34/100
4 81089 Walsenburg CO 11.0 ppb 44/100
5 80033 Wheat Ridge CO 10.0 ppb 53/100
6 80034 Wheat Ridge CO 10.0 ppb 50/100
7 80510 Allenspark CO 10.0 ppb 51/100
8 80818 Genoa CO 9.5 ppb 46/100
9 81654 Snowmass CO 9.2 ppb 56/100
10 81415 Crawford CO 8.4 ppb 56/100
11 80435 Dillon CO 8.0 ppb 59/100
12 81143 Moffat CO 8.0 ppb 72/100
13 81131 Crestone CO 7.6 ppb 76/100
14 80452 Idaho Springs CO 7.0 ppb 63/100
15 81069 Rye CO 7.0 ppb 40/100
16 81224 Crested Butte CO 7.0 ppb 61/100
17 81225 Crested Butte CO 7.0 ppb 55/100
18 81410 Austin CO 7.0 ppb 56/100
19 80437 Evergreen CO 6.0 ppb 52/100
20 80439 Evergreen CO 6.0 ppb 42/100
21 80444 Georgetown CO 6.0 ppb 67/100
22 80550 Windsor CO 5.8 ppb 60/100
23 80551 Windsor CO 5.8 ppb 60/100
24 80901 Colorado Springs CO 5.7 ppb 65/100
25 80902 Colorado Springs CO 5.7 ppb 61/100
26 80903 Colorado Springs CO 5.7 ppb 65/100
27 80904 Colorado Springs CO 5.7 ppb 55/100
28 80905 Colorado Springs CO 5.7 ppb 60/100
29 80906 Colorado Springs CO 5.7 ppb 55/100
30 80907 Colorado Springs CO 5.7 ppb 60/100
31 80908 Colorado Springs CO 5.7 ppb 65/100
32 80909 Colorado Springs CO 5.7 ppb 60/100
33 80910 Colorado Springs CO 5.7 ppb 60/100
34 80911 Colorado Springs CO 5.7 ppb 60/100
35 80912 Colorado Springs CO 5.7 ppb 61/100
36 80913 Colorado Springs CO 5.7 ppb 61/100
37 80914 Colorado Springs CO 5.7 ppb 61/100
38 80915 Colorado Springs CO 5.7 ppb 60/100
39 80916 Colorado Springs CO 5.7 ppb 65/100
40 80917 Colorado Springs CO 5.7 ppb 60/100
41 80918 Colorado Springs CO 5.7 ppb 60/100
42 80919 Colorado Springs CO 5.7 ppb 55/100
43 80920 Colorado Springs CO 5.7 ppb 60/100
44 80921 Colorado Springs CO 5.7 ppb 60/100
45 80922 Colorado Springs CO 5.7 ppb 65/100
46 80923 Colorado Springs CO 5.7 ppb 65/100
47 80924 Colorado Springs CO 5.7 ppb 65/100
48 80925 Colorado Springs CO 5.7 ppb 65/100
49 80926 Colorado Springs CO 5.7 ppb 65/100
50 80927 Colorado Springs CO 5.7 ppb 65/100
51 80928 Colorado Springs CO 5.7 ppb 61/100
52 80929 Colorado Springs CO 5.7 ppb 65/100
53 80930 Colorado Springs CO 5.7 ppb 61/100
54 80931 Colorado Springs CO 5.7 ppb 61/100
55 80932 Colorado Springs CO 5.7 ppb 61/100
56 80933 Colorado Springs CO 5.7 ppb 61/100
57 80934 Colorado Springs CO 5.7 ppb 61/100
58 80935 Colorado Springs CO 5.7 ppb 61/100
59 80936 Colorado Springs CO 5.7 ppb 61/100
60 80937 Colorado Springs CO 5.7 ppb 61/100
61 80938 Colorado Springs CO 5.7 ppb 61/100
62 80939 Colorado Springs CO 5.7 ppb 61/100
63 80941 Colorado Springs CO 5.7 ppb 61/100
64 80942 Colorado Springs CO 5.7 ppb 61/100
65 80943 Colorado Springs CO 5.7 ppb 61/100
66 80944 Colorado Springs CO 5.7 ppb 61/100
67 80945 Colorado Springs CO 5.7 ppb 61/100
68 80946 Colorado Springs CO 5.7 ppb 61/100
69 80947 Colorado Springs CO 5.7 ppb 61/100
70 80949 Colorado Springs CO 5.7 ppb 61/100
71 80950 Colorado Springs CO 5.7 ppb 61/100
72 80951 Colorado Springs CO 5.7 ppb 65/100
73 80960 Colorado Springs CO 5.7 ppb 61/100
74 80962 Colorado Springs CO 5.7 ppb 61/100
75 80970 Colorado Springs CO 5.7 ppb 61/100
76 80977 Colorado Springs CO 5.7 ppb 61/100
77 80995 Colorado Springs CO 5.7 ppb 61/100
78 80997 Colorado Springs CO 5.7 ppb 61/100
79 80483 Yampa CO 5.1 ppb 79/100
80 80110 Englewood CO 5.0 ppb 69/100
81 80111 Englewood CO 5.0 ppb 64/100
82 80113 Englewood CO 5.0 ppb 64/100
83 80120 Littleton CO 5.0 ppb 65/100
84 80121 Littleton CO 5.0 ppb 70/100
85 80122 Littleton CO 5.0 ppb 65/100
86 80123 Littleton CO 5.0 ppb 65/100
87 80125 Littleton CO 5.0 ppb 70/100
88 80126 Littleton CO 5.0 ppb 70/100
89 80127 Littleton CO 5.0 ppb 70/100
90 80128 Littleton CO 5.0 ppb 70/100
91 80129 Littleton CO 5.0 ppb 70/100
92 80130 Littleton CO 5.0 ppb 70/100
93 80135 Sedalia CO 5.0 ppb 64/100
94 80150 Englewood CO 5.0 ppb 65/100
95 80151 Englewood CO 5.0 ppb 65/100
96 80155 Englewood CO 5.0 ppb 65/100
97 80160 Littleton CO 5.0 ppb 66/100
98 80161 Littleton CO 5.0 ppb 66/100
99 80162 Littleton CO 5.0 ppb 66/100
100 80163 Littleton CO 5.0 ppb 66/100

Methodology

Lead rankings are based on the 90th percentile lead testing value (PB90) reported by water systems under the Lead and Copper Rule. When CCR data is unavailable, EPA SDWIS lead sampling data is used. The EPA action level for lead is 15 ppb (0.015 mg/L). There is no safe level of lead exposure.

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 is a dangerous lead level in water?

The EPA action level is 15 parts per billion (ppb). The American Academy of Pediatrics recommends no more than 1 ppb for school drinking water. There is no safe level of lead exposure for children.

How is lead measured in water?

Water systems collect samples from homes with known lead service lines or lead solder. The 90th percentile value (PB90) means 90% of samples tested below that level. If PB90 exceeds 15 ppb, the system must take corrective action.

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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