Oconto County, Wisconsin
12 ZIP codes · Avg score 73/100 · Grade B · Updated 2026-06-03
Across Oconto County's 12 ZIP codes, EPA compliance data shows above-average performance — violation rates are minimal, none of the county's systems have triggered health-based MCL exceedances in recent cycles, and the county's scores have stayed above the national baseline across every recent reporting period.
How Oconto County Compares
How Oconto County Compares
Oconto County scores 7 points above the Wisconsin state average (66/100) and 5 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Oconto County, Wisconsin
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.5 (asthma 11%, diabetes 12.8%)
Estimated additional annual cost per homeowner: $765, driven primarily by energy_code_gap
Infrastructure: 0.369% avg pipe failure probability, 25% of ZIPs at high risk
59.4% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across Oconto County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 10 violations. Past 5 years: 12 total (12 health-based).
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: $765
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
20,867 housing units in Oconto 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 Oconto County
Remediation costs are relatively manageable for most homeowners in Oconto 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 Oconto 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 Oconto County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Lena Waterworks | 585 | 11 |
| 2 | GILLETT WATERWORKS | 1,264 | 7 |
| 3 | SURING WATERWORKS | 559 | 7 |
| 4 | Evergreen Park | 100 | 7 |
| 5 | Oconto Waterworks | 4,610 | 4 |
13 total water systems serve Oconto County.
All ZIP Codes in Oconto County
12 ZIP codes tracked in Oconto County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 54101 | Abrams | 83 | B | 1 | $265K |
| 2 | 54112 | Coleman | 83 | B | 1 | $173K |
| 3 | 54124 | Gillett | 83 | B | 0 | $132K |
| 4 | 54139 | Lena | 82 | B | 2 (1 health) | $184K |
| 5 | 54174 | Suring | 82 | B | 7 (1 health) | $178K |
| 6 | 54161 | Pound | 81 | B | 4 (2 health) | $192K |
| 7 | 54153 | Oconto | 72 | B | 2 (1 health) | $166K |
| 8 | 54154 | Oconto Falls | 67 | C | 2 (1 health) | $194K |
| 9 | 54111 | Cecil | 63 | C | 0 | $222K |
| 10 | 54127 | Green Valley | 63 | C | 0 | $133K |
| 11 | 54149 | Mountain | 63 | C | 0 | $193K |
| 12 | 54171 | Sobieski | 53 | D | 0 | $300K |
Recommended Buyer Guides for Oconto County
While many sites publish identical guide lists across every county they cover, the selection here changes by location — driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Lead Paint Test Kits — 59.4% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Oconto County, Wisconsin
Overview
Oconto County in Wisconsin covers 12 ZIP codes with an average Home Safety Score of B (73/100).
7 of 12 ZIP codes have recorded EPA violations. 6 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.