COUNTY REPORT WI

Grant County, Wisconsin

21 ZIP codes · Avg score 66/100 · Grade C

ZipCheckup grade for Grant County: C.

A mixed picture - some signals here are worth your attention.

Grant County: 21 ZIP codes, mid-range safety grade.

How Grant County Compares

Grant County66/100
Wisconsin avg70/100
National avg73/100

How Grant County Compares

C
County Grade
66/100
Avg Safety Score
21
ZIP Codes
10
Water Systems

Grant County scores 4 points below the Wisconsin state average (70/100) and 7 points below the national average (73/100).

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData

C
County Grade
66
Avg Safety Score
21
ZIP Codes
Best ZIP: 53813 (66/100)
Lowest ZIP: 53818 (65/100)
$183K
Median Home Value
$420
Avg Remediation (0.23% of home value)

ZIP Code Risk Map

Water Quality Map: Grant County, Wisconsin

Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.

A B C D F

Key Risk Factors

Health risk index: 13.3 (asthma 11%, diabetes 11.5%)

Modeled additional annual cost estimate per homeowner: $718, largest modeled factor: Flood

62% of homes built before 1980 (lead paint was banned for residential use in 1978)

County Health Indicators vs National Average

Asthma 11% (national: 8.9%)
Diabetes 11.5% (national: 10.5%)
Obesity 40.9% (national: 32.4%)

Black markers indicate national averages. Source: CDC PLACES, Census ACS.

Infrastructure Overview

1975
Median Build Year
62%
Pre-1980 Housing
44/100
Infrastructure Stress Indicator
60%
ZIPs with High Infrastructure Stress
High
Lead Pipe Risk

Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINSA infrastructure needs, EPA SDWIS violations, and EPA lead indicators.

Compound Risk Breakdown

Estimated additional annual cost per homeowner: $718

Flood $491/yr
Energy Code Gap $392/yr
Water / Lead $206/yr

Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).

Housing Age Distribution

21,794 housing units in Grant County

Pre-1940 24%
1940–1959 11%
1960–1979 27%
1980–1999 20%
2000+ 17%

Source: U.S. Census Bureau ACS B25034 (Year Structure Built).

Water Safety Affordability

How much it costs to fix water issues relative to home values in Grant County

$183K
Median Home Value
$420
Est. Remediation Cost
0.2%
of Home Value
Remediation as % of home value low burden

Modeled remediation costs in Grant County can be compared with the median property value; actual costs vary by property.

Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.

Health Outcomes vs National Average

CDC PLACES data for Grant County residents

Asthma 11% (US avg: 8.9%)
Diabetes 11.5% (US avg: 11%)
Obesity 40.9% (US avg: 32.4%)

Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.

Water systems mapped to Grant County ZIP codes

8 community water systems mapped to Grant County ZIP codes; EPA may list more systems serving the county.

Show all 8 water systems

10 water systems mapped to Grant County ZIP codes in our data; EPA may list more systems serving the county.

Systems with the most violations in Grant County

5 water systems with violations in EPA records.

All ZIP Codes in Grant County

21 ZIP codes tracked in Grant County.

# ZIP Code City Safety Score Grade Violations Home Value
1 53813 Lancaster 66 C 1 $205K
2 53818 Platteville 65 C 2 (1 health) $214K
3 53554 Livingston — — $166K
4 53569 Montfort — — $198K
5 53801 Bagley — — $128K
6 53802 Beetown — — $206K
7 53804 Bloomington — — $164K
8 53805 Boscobel — — 2 $147K
9 53806 Cassville — — $145K
10 53807 Cuba City — — 27 (3 health) $210K
11 53808 Dickeyville — — 2 (1 health) $183K
12 53809 Fennimore — — 3 $183K
13 53810 Glen Haven — — $152K
14 53811 Hazel Green — — 22 (4 health) $219K
15 53812 Kieler — — $195K
16 53816 Mount Hope — — $208K
17 53817 Patch Grove — — $140K
18 53820 Potosi — — 23 (1 health) $204K
19 53824 Sinsinawa — — —
20 53825 Stitzer — — $144K
21 53827 Woodman — — 2 $150K

Recommended Buyer Guides for Grant County

Which guides appear depends on what the county data show.

Overview

Grant County in Wisconsin covers 21 tracked ZIP records with an average Home Safety Score of C (66/100) across 2 scored records.

9 of 9 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 5 health-based violations appear in the available health breakdown.

← Back to Wisconsin Home Safety Profile

Data Sources

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

Frequently Asked Questions

Is water safe in Grant County?
Grant County receives a grade of C. Some ZIP codes have recorded violations and residents in affected areas may want to test their water.
How many water systems serve Grant County?
We map 10 public water systems to 21 ZIP codes in our data for Grant County. EPA may list more systems serving the county, so this is not a full count.
What is the biggest environmental risk in Grant County?
In ZipCheckup's cost model, the factor with the largest estimated average annual cost in Grant County is flood. Across all modeled risk factors, the estimated average additional annual cost is $718 per homeowner; actual costs vary by home.
How old are homes in Grant County?
The median home build year in Grant County is 1975. 62% of homes were built before 1980; homes built before 1978 may contain lead-based paint, and older homes may have older plumbing materials.
How does Grant County compare to Wisconsin?
Grant County has an average Home Safety Score of 66/100 under model 4.0.0, which is below the Wisconsin state average of 70/100.

How to cite this page

APA ZipCheckup. (2026). Grant County, WI: HSS 66/100; PFAS Found in Water. https://zipcheckup.com/county/wisconsin/grant/
BibTeX
@misc{zipcheckup-county-wisconsin-grant,
  author = {{ZipCheckup}},
  title  = {{Grant County, WI: HSS 66/100; PFAS Found in Water}},
  year   = {2026},
  url    = {https://zipcheckup.com/county/wisconsin/grant/}
}

Page version: October 2026.

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