Clark County, Wisconsin
15 ZIP codes · Avg score 74/100 · Grade B · Updated 2026-06-03
For households in Clark County, the 15 ZIP codes on record show consistently safe tap water.
How Clark County Compares
How Clark County Compares
Clark County scores 8 points above the Wisconsin state average (66/100) and 6 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Clark County, Wisconsin
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.2 (asthma 11.4%, diabetes 12.5%)
Estimated additional annual cost per homeowner: $915, driven primarily by energy_code_gap
Infrastructure: 0.405% avg pipe failure probability, 47% of ZIPs at high risk
67.6% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Clark County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 10 violations. Past 5 years: 17 total (17 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $915
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
15,284 housing units in Clark County
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 Clark County
Remediation costs are relatively manageable for most homeowners in Clark County, representing a small fraction of property value.
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 Clark County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Clark County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Clark Company Health Care Center | 510 | 14 |
| 2 | Neillsville Waterworks | 2,384 | 14 |
| 3 | Pine Island Estates | 75 | 14 |
| 4 | Grandview Mobile Home Court | 42 | 14 |
| 5 | Owen Waterworks | 936 | 13 |
19 total water systems serve Clark County.
All ZIP Codes in Clark County
15 ZIP codes tracked in Clark County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 54422 | Curtiss | 83 | B | 1 | $136K |
| 2 | 54425 | Dorchester | 83 | B | 0 | $175K |
| 3 | 54437 | Greenwood | 83 | B | 0 | $149K |
| 4 | 54446 | Loyal | 83 | B | 0 | $153K |
| 5 | 54488 | Unity | 83 | B | 1 | $138K |
| 6 | 54498 | Withee | 83 | B | 0 | $145K |
| 7 | 54405 | Abbotsford | 82 | B | 2 (1 health) | $153K |
| 8 | 54754 | Merrillan | 82 | B | 3 (1 health) | $163K |
| 9 | 54460 | Owen | 80 | B | 12 (3 health) | $157K |
| 10 | 54436 | Granton | 78 | B | 1 (1 health) | $172K |
| 11 | 54456 | Neillsville | 70 | B | 14 | $169K |
| 12 | 54771 | Thorp | 56 | C | 7 (2 health) | $178K |
| 13 | 54420 | Chili | 53 | D | 0 | $173K |
| 14 | 54447 | Lublin | 53 | D | 0 | $162K |
| 15 | 54493 | Willard | 53 | D | 0 | $215K |
Recommended Buyer Guides for Clark County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 67.6% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Clark County, Wisconsin
Overview
Clark County in Wisconsin covers 15 ZIP codes with an average Home Safety Score of B (74/100).
8 of 15 ZIP codes have recorded EPA violations. 8 health-based violations have been documented.
← Back to Wisconsin water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.