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2026 Rankings

Columbia County, Wisconsin Home Safety Rankings - 18 ZIPs

Explore rankings under Home Safety Score model 4.0.0. Only ZIPs with all four required inputs are ranked; missing evidence is not imputed or reweighted.

Columbia County, Wisconsin (Wisconsin) includes 18 tracked ZIP codes and 20 mapped community water systems; confirm service for a specific address. Below are the water quality rankings for metro ZIPs with all required inputs.

Average Home Safety Grade: B (78/100)

Grade	ZIP Codes	%
A	0	0%
B	3	100%
C	0	0%
D	0	0%
F	0	0%

Top 10 ZIP Codes by Home Safety Score

Rank	ZIP	City	Score	Grade
1	53925	Columbus	80	B
2	53578	Prairie Du Sac	78	B
3	53901	Portage	77	B

10 Riskiest ZIP Codes

Rank	ZIP	City	Score	Grade	Risk Factor
1	53901	Portage	77	B	10 violations
2	53578	Prairie Du Sac	78	B	Lead above EPA action level
3	53925	Columbus	80	B	11 violations

Most Common Contaminant Violations

Contaminant	Violations	ZIPs Affected
Lead and Copper Rule	15	9
Stage 2 DBP Rule	14	8
Consumer Confidence Report Rule	11	8
Gross Beta	10	2
Surface Water Treatment Rule	10	6
Stage 1 DBP Rule	7	6
Groundwater Rule	5	5
Gross Alpha	2	2

Lead Risk

Average of reported 90th-percentile lead results: 0.0058 mg/L (below EPA action level)
2 of 13 ZIP codes with known status exceed EPA lead action level
24% of housing built before 1950
40% of housing built before 1970

Cities in This Metro

Randolph, WI — 2 ZIP codes
Lodi, WI — 1 ZIP code
Plain, WI — 1 ZIP code
Prairie Du Sac, WI — 1 ZIP code
Portage, WI — 1 ZIP code
Arlington, WI — 1 ZIP code
Cambria, WI — 1 ZIP code
Columbus, WI — 1 ZIP code
Dalton, WI — 1 ZIP code
Doylestown, WI — 1 ZIP code
Fall River, WI — 1 ZIP code
Friesland, WI — 1 ZIP code
Pardeeville, WI — 1 ZIP code
Poynette, WI — 1 ZIP code
Rio, WI — 1 ZIP code
Wisconsin Dells, WI — 1 ZIP code
Wyocena, WI — 1 ZIP code

All 18 ZIP Codes Ranked

View complete ranking

Rank	ZIP	City	Score	Grade	Violations
1	53925	Columbus	80	B	11
2	53578	Prairie Du Sac	78	B	7
3	53901	Portage	77	B	10
4	53555	Lodi	—	—	4
5	53577	Plain	—	—	—
6	53911	Arlington	—	—	0
7	53923	Cambria	—	—	1
8	53926	Dalton	—	—	6
9	53928	Doylestown	—	—	—
10	53932	Fall River	—	—	2
11	53935	Friesland	—	—	—
12	53954	Pardeeville	—	—	12
13	53955	Poynette	—	—	4
14	53956	Randolph	—	—	8
15	53960	Rio	—	—	4
16	53965	Wisconsin Dells	—	—	5
17	53969	Wyocena	—	—	—

Data Sources

Water quality: EPA SDWIS
Housing: U.S. Census Bureau American Community Survey
Flood: FEMA NFIP
Flood scope: historical NFIP claim records and claim-rated-zone evidence; this is not current property-map coverage.

Reporting periods vary by source; the page metadata identifies this materialization.

Methodology
Model 4.0.0 averages SDWIS water compliance and UCMR5 PFAS within drinking water, then averages drinking water, county radon, and annual AQI as three equal domains. All four inputs are required. Score methodology → · Rankings methodology →

Disclaimer: Scores are based on EPA SDWIS reported data and are not a guarantee of current water safety. Water quality can change. For the most current information, contact your local water utility or request a Consumer Confidence Report.

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How to cite this page

APA

ZipCheckup. (2026). Columbia County, Wisconsin Home Safety Rankings - 18 ZIPs. https://zipcheckup.com/rankings/metro/columbia-wisconsin/

BibTeX

@misc{zipcheckup-rankings-metro-columbia-wisconsin,
  author = {{ZipCheckup}},
  title  = {{Columbia County, Wisconsin Home Safety Rankings - 18 ZIPs}},
  year   = {2026},
  url    = {https://zipcheckup.com/rankings/metro/columbia-wisconsin/}
}

Page version: October 2026.

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