CONGRESSIONAL DISTRICT WI

Wisconsin — 4th District

119th Congress · 58 ZIP codes · Avg score 61/100 · Grade C · Updated 2026-06-03

Data: EPA SDWIS / Census 119th Congress Last verified: 2026-06-03

C
District Grade
61
Avg Safety Score
58
ZIP Codes
5160
Total Violations
112
Health Violations
42
Water Systems
Best ZIP: 53156 (70/100)
Lowest ZIP: 53538 (34/100)

Top Contaminants

Consumer Confidence Report Rule (864) Lead and Copper Rule (345) Stage 1 DBP Rule (274) Surface Water Treatment Rule (267) Stage 2 DBP Rule (178)

ZIP Codes in This District

58 ZIP codes tracked in Wisconsin's 4th District. Showing top 50 by safety score.

# ZIP Code City Safety Score Grade Violations
1 53156 Palmyra 70 B 1
2 53178 Sullivan 70 B 0
3 53038 Johnson Creek 69 C 17 (1 health)
4 53036 Ixonia 68 C 4
5 53201 Milwaukee 67 C 120 (2 health)
6 53202 Milwaukee 67 C 120 (2 health)
7 53203 Milwaukee 67 C 120 (2 health)
8 53204 Milwaukee 67 C 120 (2 health)
9 53205 Milwaukee 67 C 120 (2 health)
10 53206 Milwaukee 67 C 120 (2 health)
11 53207 Milwaukee 67 C 120 (2 health)
12 53210 Milwaukee 67 C 120 (2 health)
13 53212 Milwaukee 67 C 120 (2 health)
14 53214 Milwaukee 67 C 120 (2 health)
15 53219 Milwaukee 67 C 120 (2 health)
16 53220 Milwaukee 67 C 120 (2 health)
17 53228 Milwaukee 67 C 120 (2 health)
18 53233 Milwaukee 67 C 120 (2 health)
19 53089 Sussex 66 C 6 (1 health)
20 53234 Milwaukee 63 C 120 (2 health)
21 53237 Milwaukee 63 C 120 (2 health)
22 53244 Milwaukee 63 C 120 (2 health)
23 53259 Milwaukee 63 C 120 (2 health)
24 53263 Milwaukee 63 C 120 (2 health)
25 53267 Milwaukee 63 C 120 (2 health)
26 53268 Milwaukee 63 C 120 (2 health)
27 53274 Milwaukee 63 C 120 (2 health)
28 53278 Milwaukee 63 C 120 (2 health)
29 53288 Milwaukee 63 C 120 (2 health)
30 53290 Milwaukee 63 C 120 (2 health)
31 53293 Milwaukee 63 C 120 (2 health)
32 53295 Milwaukee 63 C 120 (2 health)
33 53018 Delafield 62 C 25 (5 health)
34 53208 Milwaukee 62 C 120 (2 health)
35 53211 Milwaukee 62 C 120 (2 health)
36 53215 Milwaukee 62 C 120 (2 health)
37 53221 Milwaukee 62 C 120 (2 health)
38 53222 Milwaukee 62 C 120 (2 health)
39 53224 Milwaukee 62 C 120 (2 health)
40 53225 Milwaukee 62 C 120 (2 health)
41 53226 Milwaukee 62 C 120 (2 health)
42 53227 Milwaukee 62 C 120 (2 health)
43 53551 Lake Mills 58 C 3 (1 health)
44 53213 Milwaukee 57 C 120 (2 health)
45 53216 Milwaukee 57 C 120 (2 health)
46 53223 Milwaukee 57 C 120 (2 health)
47 53003 Ashippun 53 D 0
48 53118 Dousman 53 D 24 (11 health)
49 53066 Oconomowoc 52 D 7
50 53209 Milwaukee 52 D 120 (2 health)

Overview

Wisconsin's 4th District serving an estimated 29,212,157 residents encompasses 58 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (61/100).

5160 EPA violations have been recorded across this district's water systems. 112 are health-based violations. About 93% of tracked ZIP codes have at least one violation.

Top Contaminants

The most frequently cited water quality issues in this district:

  • Consumer Confidence Report Rule — 864 violations
  • Lead and Copper Rule — 345 violations
  • Stage 1 DBP Rule — 274 violations
  • Surface Water Treatment Rule — 267 violations
  • Stage 2 DBP Rule — 178 violations

Housing Context

Homes in this district were built on average around 1956 (~70 years old). Older homes may have lead pipes or solder — consider a water filter if your home predates 1986.

Lead Alert: 1 ZIP code in this district exceed the EPA action level for lead. Consider using a certified lead-removal filter.

Data Sources

Updated daily. Data covers 58 ZIP codes in Wisconsin's 4th District.

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