2026 Rankings

Worst ZIP Codes for Lead in Water in Wisconsin — 2026

Last updated: June 4, 2026

698 ZIP codes ranked by Lead (mg/L) #1: ZIP 54215 (Kellnersville, WI) — 49.4 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 698 ZIP codes with data in Wisconsin, these are the highest-ranked areas for lead (mg/l). See also: National Worst ZIP Codes for Lead in Water | All Wisconsin Rankings

Statistic Value
ZIP codes ranked 698
Highest value 49.4 ppb
Median value 2.1 ppb
State Wisconsin

Top 100 Worst ZIP Codes

Rank ZIP Code City State Lead (mg/L) Safety Score
1 54215 Kellnersville WI 49.4 ppb 48/100
2 53565 Mineral Point WI 37.0 ppb 43/100
3 54625 Dodge WI 31.8 ppb 55/100
4 54180 Wrightstown WI 29.5 ppb 57/100
5 54645 Mount Sterling WI 28.0 ppb 28/100
6 54971 Ripon WI 28.0 ppb 44/100
7 54404 Marshfield WI 27.0 ppb 32/100
8 54441 Hewitt WI 27.0 ppb 53/100
9 54449 Marshfield WI 27.0 ppb 44/100
10 54472 Marshfield WI 27.0 ppb 32/100
11 54630 Galesville WI 21.6 ppb 57/100
12 54771 Thorp WI 21.0 ppb 56/100
13 54724 Bloomer WI 20.0 ppb 57/100
14 53039 Juneau WI 19.0 ppb 24/100
15 53555 Lodi WI 18.0 ppb 43/100
16 54806 Ashland WI 18.0 ppb 45/100
17 54140 Little Chute WI 17.0 ppb 49/100
18 54216 Kewaunee WI 16.0 ppb 57/100
19 53094 Watertown WI 15.0 ppb 28/100
20 53098 Watertown WI 15.0 ppb 28/100
21 53105 Burlington WI 15.0 ppb 49/100
22 54241 Two Rivers WI 15.0 ppb 52/100
23 53121 Elkhorn WI 14.0 ppb 41/100
24 53014 Chilton WI 13.0 ppb 62/100
25 53538 Fort Atkinson WI 13.0 ppb 34/100
26 54136 Kimberly WI 13.0 ppb 56/100
27 54961 New London WI 13.0 ppb 40/100
28 53952 Oxford WI 12.6 ppb 63/100
29 53029 Hartland WI 12.0 ppb 48/100
30 53090 West Bend WI 12.0 ppb 51/100
31 53095 West Bend WI 12.0 ppb 51/100
32 54411 Athens WI 12.0 ppb 42/100
33 54945 Iola WI 12.0 ppb 41/100
34 54990 Iola WI 12.0 ppb 41/100
35 53916 Beaver Dam WI 11.3 ppb 54/100
36 54562 Three Lakes WI 11.2 ppb 59/100
37 53534 Edgerton WI 11.0 ppb 43/100
38 54154 Oconto Falls WI 11.0 ppb 67/100
39 53070 Oostburg WI 10.5 ppb 69/100
40 53925 Columbus WI 10.2 ppb 61/100
41 53115 Delavan WI 10.0 ppb 52/100
42 53190 Whitewater WI 10.0 ppb 51/100
43 53545 Janesville WI 10.0 ppb 47/100
44 53546 Janesville WI 10.0 ppb 52/100
45 53547 Janesville WI 10.0 ppb 49/100
46 53548 Janesville WI 10.0 ppb 52/100
47 53581 Richland Center WI 10.0 ppb 46/100
48 54956 Neenah WI 9.9 ppb 74/100
49 54957 Neenah WI 9.9 ppb 78/100
50 53049 Malone WI 9.5 ppb 53/100
51 53057 Mount Calvary WI 9.5 ppb 66/100
52 54932 Eldorado WI 9.5 ppb 40/100
53 54935 Fond Du Lac WI 9.5 ppb 42/100
54 54936 Fond Du Lac WI 9.5 ppb 49/100
55 54937 Fond Du Lac WI 9.5 ppb 47/100
56 54974 Rosendale WI 9.5 ppb 40/100
57 54979 Van Dyne WI 9.5 ppb 40/100
58 53184 Walworth WI 9.2 ppb 49/100
59 53110 Cudahy WI 9.0 ppb 73/100
60 53013 Cedar Grove WI 8.9 ppb 73/100
61 54732 Cornell WI 8.5 ppb 74/100
62 53048 Lomira WI 8.2 ppb 53/100
63 53128 Genoa City WI 8.1 ppb 56/100
64 53913 Baraboo WI 8.1 ppb 70/100
65 53951 North Freedom WI 8.1 ppb 78/100
66 54110 Brillion WI 8.1 ppb 70/100
67 54475 Rudolph WI 8.1 ppb 40/100
68 54494 Wisconsin Rapids WI 8.1 ppb 52/100
69 54495 Wisconsin Rapids WI 8.1 ppb 57/100
70 53147 Lake Geneva WI 8.0 ppb 56/100
71 54632 Genoa WI 7.8 ppb 54/100
72 53172 South Milwaukee WI 7.7 ppb 72/100
73 54220 Manitowoc WI 7.7 ppb 71/100
74 54221 Manitowoc WI 7.7 ppb 74/100
75 53080 Saukville WI 7.6 ppb 68/100
76 54901 Oshkosh WI 7.5 ppb 55/100
77 54902 Oshkosh WI 7.5 ppb 50/100
78 54903 Oshkosh WI 7.5 ppb 60/100
79 54904 Oshkosh WI 7.5 ppb 55/100
80 54906 Oshkosh WI 7.5 ppb 53/100
81 54927 Butte Des Morts WI 7.5 ppb 53/100
82 54942 Greenville WI 7.5 ppb 73/100
83 53012 Cedarburg WI 7.3 ppb 72/100
84 54474 Rothschild WI 7.3 ppb 58/100
85 53518 Blue River WI 7.3 ppb 64/100
86 53551 Lake Mills WI 7.1 ppb 58/100
87 53946 Markesan WI 7.1 ppb 65/100
88 53919 Brandon WI 6.9 ppb 60/100
89 53066 Oconomowoc WI 6.8 ppb 54/100
90 54245 Valders WI 6.8 ppb 77/100
91 54004 Clayton WI 6.5 ppb 77/100
92 53583 Sauk City WI 6.4 ppb 57/100
93 54933 Embarrass WI 6.4 ppb 59/100
94 54805 Almena WI 6.3 ppb 77/100
95 53536 Evansville WI 6.3 ppb 61/100
96 53901 Portage WI 6.2 ppb 69/100
97 53073 Plymouth WI 6.2 ppb 76/100
98 53586 Shullsburg WI 6.1 ppb 67/100
99 54234 Sister Bay WI 6.1 ppb 67/100
100 54406 Amherst WI 6.0 ppb 62/100

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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