Green Lake County, Wisconsin
7 ZIP codes · Avg score 57/100 · Grade C · Updated 2026-06-04
Water systems across Green Lake County's 7 ZIP codes produce average compliance results overall — pockets with documented violations exist, and the variation between areas makes ZIP-level lookup the most useful tool for residents here.
How Green Lake County Compares
How Green Lake County Compares
Green Lake County scores 9 points below the Wisconsin state average (66/100) and 11 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Green Lake County, Wisconsin
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.9 (asthma 11.1%, diabetes 13.8%)
Estimated additional annual cost per homeowner: $1,409, driven primarily by flood
Infrastructure: 0.406% avg pipe failure probability, 57% of ZIPs at high risk
70.7% of homes built before 1978 (lead paint era)
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: $1,409
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
12,653 housing units in Green Lake 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 Green Lake County
Remediation costs are relatively manageable for most homeowners in Green Lake 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 Green Lake 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 Green Lake County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Green Lake Waterworks | 1,002 | 6 |
| 2 | Dakota Capital Mhc Llc | 102 | 6 |
| 3 | Lamplighter Mhc Llc | 80 | 6 |
| 4 | Green Lake Mhp | 70 | 6 |
| 5 | PRINCETON WATERWORKS | 1,166 | 5 |
7 total water systems serve Green Lake County.
All ZIP Codes in Green Lake County
7 ZIP codes tracked in Green Lake County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 54941 | Green Lake | 69 | C | 6 (1 health) | $270K |
| 2 | 54968 | Princeton | 69 | C | 5 (1 health) | $180K |
| 3 | 53946 | Markesan | 65 | C | 0 | $233K |
| 4 | 54923 | Berlin | 65 | C | 0 | $180K |
| 5 | 53947 | Marquette | 53 | D | 0 | $211K |
| 6 | 53939 | Kingston | 40 | D | 0 | $131K |
| 7 | 54960 | Neshkoro | 40 | D | 0 | $206K |
Recommended Buyer Guides for Green Lake County
Editorial-only picks, screened against the EPA detections on file.
- Best Lead Paint Test Kits — 70.7% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Green Lake County, Wisconsin
Overview
Green Lake County in Wisconsin covers 7 ZIP codes with an average Home Safety Score of C (57/100).
2 of 7 ZIP codes have recorded EPA violations. 2 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.