Worst Infrastructure: Wisconsin — 2026 Rankings

Out of 778 ZIP codes with infrastructure data in Wisconsin, these areas face the highest estimated risk of water pipe failure based on infrastructure age, funding gaps, and violation history.

Statistic	Value
ZIP codes ranked	778
Highest risk	NaN%
Median risk	NaN%
Average risk	NaN%
State	Wisconsin

Top 100 Highest Risk ZIP Codes

Rank	ZIP Code	City	State	Pipe Failure Risk	Risk Level	Safety Score
1	53001	Adell	WI	NaN%	Unknown	—
2	53002	Allenton	WI	NaN%	Unknown	—
3	53003	Ashippun	WI	NaN%	Unknown	—
4	53004	Belgium	WI	NaN%	Unknown	—
5	53005	Brookfield	WI	NaN%	Unknown	64/100
6	53006	Brownsville	WI	NaN%	Unknown	—
7	53007	Butler	WI	NaN%	Unknown	—
8	53010	Campbellsport	WI	NaN%	Unknown	—
9	53011	Cascade	WI	NaN%	Unknown	—
10	53012	Cedarburg	WI	NaN%	Unknown	81/100
11	53013	Cedar Grove	WI	NaN%	Unknown	—
12	53014	Chilton	WI	NaN%	Unknown	—
13	53015	Cleveland	WI	NaN%	Unknown	—
14	53016	Clyman	WI	NaN%	Unknown	—
15	53017	Colgate	WI	NaN%	Unknown	—
16	53018	Delafield	WI	NaN%	Unknown	—
17	53019	Eden	WI	NaN%	Unknown	—
18	53020	Elkhart Lake	WI	NaN%	Unknown	—
19	53021	Fredonia	WI	NaN%	Unknown	—
20	53022	Germantown	WI	NaN%	Unknown	—
21	53023	Glenbeulah	WI	NaN%	Unknown	—
22	53024	Grafton	WI	NaN%	Unknown	67/100
23	53027	Hartford	WI	NaN%	Unknown	—
24	53029	Hartland	WI	NaN%	Unknown	33/100
25	53031	Hingham	WI	NaN%	Unknown	—
26	53032	Horicon	WI	NaN%	Unknown	61/100
27	53033	Hubertus	WI	NaN%	Unknown	—
28	53034	Hustisford	WI	NaN%	Unknown	—
29	53035	Iron Ridge	WI	NaN%	Unknown	—
30	53036	Ixonia	WI	NaN%	Unknown	—
31	53037	Jackson	WI	NaN%	Unknown	—
32	53038	Johnson Creek	WI	NaN%	Unknown	—
33	53039	Juneau	WI	NaN%	Unknown	—
34	53040	Kewaskum	WI	NaN%	Unknown	—
35	53042	Kiel	WI	NaN%	Unknown	81/100
36	53044	Kohler	WI	NaN%	Unknown	66/100
37	53045	Brookfield	WI	NaN%	Unknown	61/100
38	53046	Lannon	WI	NaN%	Unknown	—
39	53047	Lebanon	WI	NaN%	Unknown	—
40	53048	Lomira	WI	NaN%	Unknown	—
41	53049	Malone	WI	NaN%	Unknown	—
42	53050	Mayville	WI	NaN%	Unknown	66/100
43	53051	Menomonee Falls	WI	NaN%	Unknown	62/100
44	53057	Mount Calvary	WI	NaN%	Unknown	—
45	53058	Nashotah	WI	NaN%	Unknown	—
46	53059	Neosho	WI	NaN%	Unknown	—
47	53061	New Holstein	WI	NaN%	Unknown	—
48	53063	Newton	WI	NaN%	Unknown	—
49	53065	Oakfield	WI	NaN%	Unknown	—
50	53066	Oconomowoc	WI	NaN%	Unknown	60/100
51	53069	Okauchee	WI	NaN%	Unknown	—
52	53070	Oostburg	WI	NaN%	Unknown	—
53	53072	Pewaukee	WI	NaN%	Unknown	33/100
54	53073	Plymouth	WI	NaN%	Unknown	83/100
55	53074	Port Washington	WI	NaN%	Unknown	65/100
56	53075	Random Lake	WI	NaN%	Unknown	—
57	53076	Richfield	WI	NaN%	Unknown	—
58	53078	Rubicon	WI	NaN%	Unknown	—
59	53079	Saint Cloud	WI	NaN%	Unknown	—
60	53080	Saukville	WI	NaN%	Unknown	65/100
61	53081	Sheboygan	WI	NaN%	Unknown	66/100
62	53083	Sheboygan	WI	NaN%	Unknown	66/100
63	53085	Sheboygan Falls	WI	NaN%	Unknown	82/100
64	53086	Slinger	WI	NaN%	Unknown	—
65	53088	Stockbridge	WI	NaN%	Unknown	—
66	53089	Sussex	WI	NaN%	Unknown	50/100
67	53090	West Bend	WI	NaN%	Unknown	—
68	53091	Theresa	WI	NaN%	Unknown	—
69	53092	Thiensville	WI	NaN%	Unknown	67/100
70	53093	Waldo	WI	NaN%	Unknown	—
71	53094	Watertown	WI	NaN%	Unknown	66/100
72	53095	West Bend	WI	NaN%	Unknown	—
73	53097	Mequon	WI	NaN%	Unknown	79/100
74	53098	Watertown	WI	NaN%	Unknown	—
75	53099	Woodland	WI	NaN%	Unknown	—
76	53103	Big Bend	WI	NaN%	Unknown	—
77	53104	Bristol	WI	NaN%	Unknown	—
78	53105	Burlington	WI	NaN%	Unknown	67/100
79	53108	Caledonia	WI	NaN%	Unknown	80/100
80	53110	Cudahy	WI	NaN%	Unknown	83/100
81	53114	Darien	WI	NaN%	Unknown	50/100
82	53115	Delavan	WI	NaN%	Unknown	50/100
83	53118	Dousman	WI	NaN%	Unknown	—
84	53119	Eagle	WI	NaN%	Unknown	—
85	53120	East Troy	WI	NaN%	Unknown	67/100
86	53121	Elkhorn	WI	NaN%	Unknown	65/100
87	53122	Elm Grove	WI	NaN%	Unknown	65/100
88	53125	Fontana	WI	NaN%	Unknown	—
89	53126	Franksville	WI	NaN%	Unknown	80/100
90	53127	Genesee Depot	WI	NaN%	Unknown	—
91	53128	Genoa City	WI	NaN%	Unknown	—
92	53129	Greendale	WI	NaN%	Unknown	—
93	53130	Hales Corners	WI	NaN%	Unknown	83/100
94	53132	Franklin	WI	NaN%	Unknown	82/100
95	53137	Helenville	WI	NaN%	Unknown	—
96	53139	Kansasville	WI	NaN%	Unknown	—
97	53140	Kenosha	WI	NaN%	Unknown	82/100
98	53142	Kenosha	WI	NaN%	Unknown	80/100
99	53143	Kenosha	WI	NaN%	Unknown	83/100
100	53144	Kenosha	WI	NaN%	Unknown	82/100

Methodology

Infrastructure risk rankings combine four data sources, each weighted equally (25%): (1) EPA Drinking Water Infrastructure Needs Survey (DWINS 2023) — state-level 20-year funding gap per capita for pipe replacement, treatment, and storage; (2) Census ACS housing vintage — percentage of homes built before 1980, when lead solder and galvanized pipes were common; (3) EPA SDWIS violation and enforcement data — system-level compliance history; (4) Lead and Copper Rule indicators — service line material inventories and 90th percentile lead testing results. The combined score is normalized to a 0-100% probability scale.

Data sources: EPA DWINS 2023, Census ACS, EPA SDWIS, Lead and Copper Rule data. Last updated: 2026-08-31.

Frequently Asked Questions

What does pipe failure probability mean?

Pipe failure probability estimates the likelihood of water main breaks, lead contamination from corroded pipes, or service disruptions based on infrastructure age, state funding gaps, violation history, and lead indicators. It is not a prediction of imminent failure, but a risk assessment based on known factors.

How is infrastructure risk calculated?

The risk score combines four equally weighted factors: state-level infrastructure funding gap per capita (from EPA DWINS 2023), housing vintage (Census ACS pre-1980 housing percentage), water system violation and enforcement history (EPA SDWIS), and lead exposure indicators (service line probability and testing results).

What can homeowners do about aging infrastructure?

Test your tap water annually, especially for lead. Check if your home has a lead service line through your water utility. Consider a whole-house water filter (NSF/ANSI 53 certified). Review your water system Consumer Confidence Report for violation history.

Does high risk mean my water is unsafe right now?

Not necessarily. Infrastructure risk indicates long-term vulnerability, not current contamination. However, areas with aging pipes and high violation counts have a statistically higher chance of water quality issues. Regular testing is the best way to verify your water safety.