STATE REPORT WI 270 HEALTH VIOLATIONS

Wisconsin Home Safety Profiles by ZIP

898 ZIP codes · 430 water systems · State-specific plumbing code · Updated

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData, NWS, State plumbing boards, Rewiring America

ZipCheckup tracks drinking-water and home-safety data for 898 ZIP codes across Wisconsin, covering 430 public water systems that serve about 3,676,900 people. 372 ZIP codes carry at least one EPA violation on record.

898
ZIP Codes
430
Water Systems
372
ZIPs with Violations
State-specific
Plumbing Code
B · 70
Avg Safety Score
13
ZIPs Exceeding Lead Limit
44%
High Radon Risk (Zone 1)
#29
of 50 States
47%
ZIPs Rated A or B
80%
ZIPs with Violations
B
Wisconsin average: 70/100 - ranked #29 of 50 states. 3 points below the national average (73). 80% of ZIP codes have recorded violations.

Across Wisconsin, most residents receive tap water that meets or exceeds federal safety standards in current EPA monitoring cycles.

Score Distribution

How Wisconsin's 898 ZIP codes are distributed across safety grades.

0
A
83
B
72
C
17
D
5
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

Model 4.0.0 inputs: EPA SDWIS, UCMR5 PFAS, EPA radon zones, annual county AQI •

Top 10 Safest ZIP Codes in Wisconsin

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 53073 PlymouthSheboygan 83 B
2 53110 CudahyMilwaukee 83 B
3 53130 Hales CornersMilwaukee 83 B
4 53143 KenoshaKenosha 83 B
5 53172 South MilwaukeeMilwaukee 83 B
6 53202 MilwaukeeMilwaukee 83 B
7 53203 MilwaukeeMilwaukee 83 B
8 53204 MilwaukeeMilwaukee 83 B
9 53205 MilwaukeeMilwaukee 83 B
10 53206 MilwaukeeMilwaukee 83 B

10 Lowest-Scoring ZIP Codes in Wisconsin

#ZIP CodeCityCountyScoreGradeViolations
1 53188 WaukeshaWaukesha 33 F 133
2 53186 WaukeshaWaukesha 33 F 97
3 53147 Lake GenevaWalworth 33 F 63
4 53072 PewaukeeWaukesha 33 F 142
5 53029 HartlandWaukesha 33 F 50
6 54474 RothschildMarathon 45 D 6
7 54476 SchofieldMarathon 47 D 4
8 53156 PalmyraJefferson 49 D 3
9 54403 WausauMarathon 50 D 1
10 54401 WausauMarathon 50 D 0

County Rankings

Water quality breakdown by county. 72 counties with data in Wisconsin.

Loading county map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

County-level aggregation of measured ZIP Home Safety Scores • EPA SDWIS, UCMR 5 PFAS, EPA radon zones, EPA AirData

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
55001 N/A N/A 7 N/A N/A
55003 80 B 9 54806 (80) 54806 (80)
55005 N/A N/A 14 N/A N/A
55007 N/A N/A 11 N/A N/A
55009 81 B 21 54162 (83) 54313 (79)
55011 N/A N/A 6 N/A N/A
55013 N/A N/A 5 N/A N/A
55015 N/A N/A 11 N/A N/A
55017 N/A N/A 10 N/A N/A
55019 N/A N/A 15 N/A N/A
55021 79 B 12 53925 (80) 53901 (77)
55023 N/A N/A 10 N/A N/A
55025 61 C 58 53572 (67) 53705 (50)
55027 64 C 22 53050 (66) 53032 (61)
55029 50 D 12 54235 (50) 54235 (50)
55031 N/A N/A 11 N/A N/A
55033 N/A N/A 12 N/A N/A
55035 67 C 7 54720 (81) 54703 (58)
55037 N/A N/A 2 N/A N/A
55039 64 C 17 53963 (66) 54971 (63)
55041 N/A N/A 5 N/A N/A
55043 66 C 21 53813 (66) 53818 (65)
55045 N/A N/A 6 N/A N/A
55047 N/A N/A 7 N/A N/A
55049 N/A N/A 14 N/A N/A
55051 N/A N/A 7 N/A N/A
55053 79 B 7 54615 (79) 54615 (79)
55055 62 C 11 53094 (66) 53156 (49)
55057 N/A N/A 10 N/A N/A
55059 82 B 20 53143 (83) 53142 (80)
55061 N/A N/A 4 N/A N/A
55063 71 B 10 54669 (82) 54601 (57)
55065 N/A N/A 9 N/A N/A
55067 N/A N/A 9 N/A N/A
55069 N/A N/A 5 N/A N/A
55071 81 B 16 53042 (81) 54241 (81)
55073 51 D 20 54455 (64) 54474 (45)
55075 N/A N/A 13 N/A N/A
55077 N/A N/A 6 N/A N/A
55078 N/A N/A 2 N/A N/A
55079 82 B 49 53110 (83) 53217 (67)
55081 83 B 10 54656 (83) 54660 (83)
55083 N/A N/A 12 N/A N/A
55085 N/A N/A 10 N/A N/A
55087 81 B 17 54165 (83) 54130 (74)
55089 71 B 8 53012 (81) 53080 (65)
55091 N/A N/A 4 N/A N/A
55093 N/A N/A 10 N/A N/A
55095 N/A N/A 12 N/A N/A
55097 N/A N/A 12 N/A N/A
55099 N/A N/A 9 N/A N/A
55101 76 B 16 53182 (81) 53406 (67)
55103 N/A N/A 7 N/A N/A
55105 65 C 16 53546 (67) 53536 (60)
55107 N/A N/A 7 N/A N/A
55109 N/A N/A 13 N/A N/A
55111 81 B 13 53913 (83) 53578 (78)
55113 N/A N/A 8 N/A N/A
55115 N/A N/A 14 N/A N/A
55117 73 B 15 53073 (83) 53083 (66)
55119 67 C 9 54451 (67) 54451 (67)
55121 N/A N/A 11 N/A N/A
55123 N/A N/A 11 N/A N/A
55125 N/A N/A 11 N/A N/A
55127 55 C 15 53120 (67) 53147 (33)
55129 N/A N/A 7 N/A N/A
55131 N/A N/A 11 N/A N/A
55133 52 D 32 53122 (65) 53188 (33)
55135 N/A N/A 14 N/A N/A
55137 N/A N/A 9 N/A N/A
55139 N/A N/A 16 N/A N/A
55141 N/A N/A 16 N/A N/A

Most Common Contaminants in Wisconsin

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Lead and Copper Rule Treatment Technique 238 589 No
Stage 2 DBP Rule Treatment Technique 225 352 Yes
Stage 1 DBP Rule Treatment Technique 157 302 Yes
Surface Water Treatment Rule Treatment Technique 106 244 No
Consumer Confidence Report Rule Reporting 103 151 Yes
Haloacetic Acids (HAA5) Disinfection Byproducts 81 98 Yes
Total Trihalomethanes (TTHM) Disinfection Byproducts 74 87 Yes
Gross Beta Radionuclides 46 316 Yes

Overview

We track multi-source home safety signals for 898 ZIP records across Wisconsin. Home Safety Score model 4.0.0 is published for 177 scored records; missing required evidence suppresses the score.

The EPA snapshots used for this build directly map water systems to 466 ZIP records, covering 430 community water systems that serve approximately 3,676,900 people.

372 of 466 ZIP codes with a reported violation count in the available EPA record (80%) have recorded EPA violations. 270 health-based violations appear in the available health breakdown.

Plumbing Regulations

Wisconsin follows the Wisconsin Comm 82 Plumbing Code (Current edition).

  • Plumbing code: State-specific (Current)
  • Homeowner DIY: Licensed plumber required
  • Water heater permit: Required
  • Annual backflow test: Required

Full Wisconsin regulations →

Areas with Most Violations

ZIP Code City Home Safety Grade Violations Health-Based System
53072 Pewaukee F 142 95 Pewaukee Village Waterworks
53188 Waukesha F 133 94 Waukesha Water Utility
53186 Waukesha F 97 71 Waukesha Water Utility
53189 Waukesha D 79 60 Waukesha Water Utility
53146 New Berlin D 76 60 New Berlin Water Utility
53183 Wales — 76 61 Waukesha Water Utility
53095 West Bend — 71 2 West Bend Waterworks
53115 Delavan D 69 2 Delavan Waterworks
53040 Kewaskum — 67 0 Kewaskum Waterworks
53147 Lake Geneva F 63 5 Lake Geneva Utility Commission

Areas with No Violations

ZIP Code City Home Safety Grade System Population
53002 Allenton — Allenton Sanitary District 860
53020 Elkhart Lake — Elkhart Lake Waterworks 1,567
53034 Hustisford — Hustisford Waterworks 1,063
53035 Iron Ridge — Hustisford Waterworks 1,063
53036 Ixonia — Hustisford Waterworks 1,063
53046 Lannon — Menomonee Falls Ww - Surface Water 23,867
53059 Neosho — Hustisford Waterworks 1,063
53061 New Holstein — New Holstein Waterworks 3,012
53065 Oakfield — Oakfield Waterworks 1,058
53110 Cudahy B Cudahy Waterworks 18,659

Home Safety Score

Average Home Safety Score for Wisconsin: B (70/100) across 177 scored of 898 tracked ZIP records.

Model 4.0.0 uses the canonical components water-compliance, pfas-mcl-screen, radon-zone, annual-aqi across 3 required domains. The sections below provide additional context and do not change that score. Missing required evidence suppresses the score, and a favorable result is not a property-level safety certification.

Lead & Copper

  • Average lead level (90th percentile): 0.0048 mg/L (EPA action level: 0.015 mg/L)
  • 13 of 466 ZIP codes with known status exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 396 ZIP codes (44%)
  • Moderate risk (Zone 2): 502 ZIP codes
  • Low risk (Zone 3): 0 ZIP codes

ZIP Code Reports for Wisconsin

Largest Communities

ZIP Code City Population Safety Grade Violations
53214 Milwaukee 738,304 B 0
53217 Milwaukee 696,383 C 17
53211 Milwaukee 689,475 C 16
53219 Milwaukee 689,240 B 0
53221 Milwaukee 684,233 B 4
53208 Milwaukee 675,064 B 0
53210 Milwaukee 675,064 B 0
53213 Milwaukee 675,064 B 0
53222 Milwaukee 675,064 B 0
53226 Milwaukee 675,064 B 0
53209 Milwaukee 661,598 B 0
53212 Milwaukee 661,598 B 0
53207 Milwaukee 647,340 B 1
53220 Milwaukee 640,393 B 2
53202 Milwaukee 626,000 B 0
53203 Milwaukee 626,000 B 0
53204 Milwaukee 626,000 B 0
53205 Milwaukee 626,000 B 0
53206 Milwaukee 626,000 B 0
53215 Milwaukee 626,000 B 0

Lowest Published Home Safety Scores

ZIP Code City Score Grade Violations
53029 Hartland 33 F 50
53072 Pewaukee 33 F 142
53147 Lake Geneva 33 F 63
53186 Waukesha 33 F 97
53188 Waukesha 33 F 133

Highest Published Home Safety Scores

ZIP Code City Score Grade Violations
53073 Plymouth 83 B 4
53110 Cudahy 83 B 0
53130 Hales Corners 83 B 2
53143 Kenosha 83 B 0
53172 South Milwaukee 83 B 1

All 898 ZIP Codes in Wisconsin

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Largest water systems in Wisconsin

The 12 biggest community water systems serving Wisconsin, of 430 total.

Show all 12 water systems

Systems with the most violations in Wisconsin

12 systems in Wisconsin with the most recorded EPA violations.

Frequently Asked Questions

Is the water safe to drink in Wisconsin?

Wisconsin has 430 community water systems serving 3,676,900 people across 898 ZIP codes. There are 1,277 recorded violations, including 270 health-based. 372 of 898 ZIP codes have at least one violation.

What plumbing code does Wisconsin follow?

Wisconsin follows the State-specific plumbing code. A licensed plumber is generally required for plumbing work.

Is lead a concern in Wisconsin's drinking water?

13 ZIP codes in Wisconsin have lead levels exceeding the EPA action level of 0.015 mg/L.

What is the radon risk in Wisconsin?

44% of ZIP codes in Wisconsin fall in EPA Radon Zone 1 (highest risk).

How to cite this page

APA ZipCheckup. (2026). Wisconsin Home Safety Profiles by ZIP. https://zipcheckup.com/states/wisconsin/
BibTeX 
@misc{zipcheckup-states-wisconsin,
  author = {{ZipCheckup}},
  title  = {{Wisconsin Home Safety Profiles by ZIP}},
  year   = {2026},
  url    = {https://zipcheckup.com/states/wisconsin/}
}

Page version: August 2026.

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