Lead · Wisconsin

Lead in Wisconsin Drinking Water — 447 ZIPs Tested

EPA data analysis for lead in Wisconsin drinking water systems

ZipCheckup tracks Lead in Wisconsin drinking water: 447 ZIP codes with detected levels on record. 259 ZIP codes exceed the EPA limit (15 ppb (action level)). Lead carries a high health-risk designation.

447
ZIPs with Detections
259
ZIPs with Violations
55.6%
Violation Rate
15 ppb (action level)
EPA Limit
High
Health Risk
Reverse Osmosis or NSF 53 Carbon Block
Best Filter Method

Lead Contamination in Wisconsin

ZipCheckup analyzed drinking water data across 466 ZIP codes in Wisconsin for lead contamination. 447 ZIP codes have reported lead detections, and 259 have EPA violations on record.

The violation rate for lead in Wisconsin is 55.6% of all ZIP codes — higher than the national average.

EPA Standard for Lead

The EPA maximum contaminant level (MCL) for lead is 15 ppb (action level), governed by the Lead and Copper Rule (LCRR/LCRI). Water systems that exceed this limit must take corrective action and notify consumers.

Worst ZIP Codes for Lead in Wisconsin

These ZIP codes reported the highest lead levels in Wisconsin based on CCR reports and EPA data:

Lowest Lead Levels in Wisconsin

These ZIP codes had the lowest reported lead detections in Wisconsin:

Health Effects of Lead

Lead is a potent neurotoxin with no safe level of exposure. In children, lead causes developmental delays, reduced IQ, and behavioral problems. In adults, it causes high blood pressure, kidney damage, and cardiovascular effects. Pregnant women face increased risk of premature birth.

How to Remove Lead From Drinking Water

The most effective treatment for lead removal is Reverse Osmosis or NSF 53 Carbon Block. Look for filters certified under NSF 53 / NSF 58 standards.

Check Your ZIP Code

Use the ZipCheckup water quality search to see lead data for your specific water system in Wisconsin.

Worst ZIP Codes for Lead in Wisconsin

Ranked by highest lead detection level.

Rank ZIP Code City Level Detected EPA Limit Status
1 53533 Dodgeville 37 ppb 15 ppb Exceeds
2 53565 Mineral Point 37 ppb 15 ppb Exceeds
3 53083 Sheboygan 22 ppb 15 ppb Exceeds
4 53085 Sheboygan Falls 22 ppb 15 ppb Exceeds
5 53555 Lodi 18 ppb 15 ppb Exceeds
6 53578 Prairie Du Sac 18 ppb 15 ppb Exceeds
7 53115 Delavan 16 ppb 15 ppb Exceeds
8 53125 Fontana 16 ppb 15 ppb Exceeds
9 53147 Lake Geneva 16 ppb 15 ppb Exceeds
10 53184 Walworth 16 ppb 15 ppb Exceeds
11 53191 Williams Bay 16 ppb 15 ppb Exceeds
12 53211 Milwaukee 16 ppb 15 ppb Exceeds
13 53217 Milwaukee 16 ppb 15 ppb Exceeds
14 53105 Burlington 15 ppb 15 ppb Within Limit
15 53018 Delafield 14 ppb 15 ppb Within Limit
16 53029 Hartland 14 ppb 15 ppb Within Limit
17 53072 Pewaukee 14 ppb 15 ppb Within Limit
18 53121 Elkhorn 14 ppb 15 ppb Within Limit
19 53014 Chilton 13 ppb 15 ppb Within Limit
20 53110 Cudahy 13 ppb 15 ppb Within Limit

Lowest Lead Levels in Wisconsin

ZIP Code City Level Detected
54986 Winneconne 1 ppb
54968 Princeton 1 ppb
54960 Neshkoro 1 ppb
54943 Hancock 1 ppb
54941 Green Lake 1 ppb
54923 Berlin 1 ppb
54826 Comstock 1 ppb
54813 Barronett 1 ppb
54773 Whitehall 1 ppb
54770 Strum 1 ppb

Cities with Lead Data in Wisconsin

156 cities in Wisconsin have lead testing data available.

+ 136 more cities

Wisconsin Water Quality Overview: See statewide water quality rankings on the Wisconsin water quality page.
Learn more about Lead: Read the full guide on Lead in drinking water.
Home → Contaminants → Lead → Wisconsin

How to cite this page

APA ZipCheckup. (2026). Lead in Wisconsin Drinking Water — 447 ZIPs Tested. https://zipcheckup.com/contaminants/lead/wisconsin/
BibTeX 
@misc{zipcheckup-contaminants-lead-wisconsin,
  author = {{ZipCheckup}},
  title  = {{Lead in Wisconsin Drinking Water — 447 ZIPs Tested}},
  year   = {2026},
  url    = {https://zipcheckup.com/contaminants/lead/wisconsin/}
}

Page version: August 2026.

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