Oneida County, Wisconsin
11 ZIP codes · Avg score 64/100 · Grade C · Updated 2026-06-03
Across Oneida County, EPA compliance data for 11 ZIP codes sits at a moderate level — not alarming, but not uniformly clean either.
How Oneida County Compares
How Oneida County Compares
Oneida County scores 2 points below the Wisconsin state average (66/100) and 4 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Oneida 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 10.5%, diabetes 13.8%)
Estimated additional annual cost per homeowner: $525, driven primarily by energy_code_gap
Infrastructure: 0.362% avg pipe failure probability, 20% of ZIPs at high risk
58.2% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across Oneida County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 10 violations. Past 5 years: 11 total (11 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: $525
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
39,953 housing units in Oneida 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 Oneida County
Remediation costs are relatively manageable for most homeowners in Oneida 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 Oneida 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 Oneida County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Northernaire Sanitary District | 315 | 18 |
| 2 | Three Lakes Sanitary District | 500 | 18 |
| 3 | LAKELAND SANITARY DIST 1 | 2,381 | 10 |
| 4 | Lakeland Village 1 | 81 | 10 |
| 5 | Patricia Lake Manufactured Housing Community | 56 | 10 |
13 total water systems serve Oneida County.
All ZIP Codes in Oneida County
11 ZIP codes tracked in Oneida County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 54539 | Lake Tomahawk | 83 | B | 0 | $241K |
| 2 | 54501 | Rhinelander | 82 | B | 5 (1 health) | $195K |
| 3 | 54521 | Eagle River | 82 | B | 7 (1 health) | $276K |
| 4 | 54548 | Minocqua | 82 | B | 10 (1 health) | $308K |
| 5 | 54562 | Three Lakes | 59 | C | 18 (3 health) | $292K |
| 6 | 54529 | Harshaw | 53 | D | 0 | $264K |
| 7 | 54531 | Hazelhurst | 53 | D | 0 | $323K |
| 8 | 54543 | Mc Naughton | 53 | D | 0 | — |
| 9 | 54558 | Saint Germain | 53 | D | 0 | $235K |
| 10 | 54560 | Sayner | 53 | D | 0 | $218K |
| 11 | 54568 | Woodruff | 53 | D | 0 | $262K |
Recommended Buyer Guides for Oneida County
Strictly editorial — no paid placements influence which guides appear; the selection draws on NSF certifications and EPA detection records for water systems serving this county.
- Best Lead Paint Test Kits — 58.2% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Oneida County, Wisconsin
Overview
Oneida County in Wisconsin covers 11 ZIP codes with an average Home Safety Score of C (64/100).
4 of 11 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.