Ontonagon County, Michigan
10 ZIP codes · Avg score 76/100 · Grade B · Updated 2026-06-03
Recent water monitoring in Ontonagon County shows 10 ZIP codes with consistently safe results.
How Ontonagon County Compares
How Ontonagon County Compares
Ontonagon County scores 2 points above the Michigan state average (74/100) and 8 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Ontonagon County, Michigan
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 16.7 (asthma 11.2%, diabetes 15.8%)
Estimated additional annual cost per homeowner: $1,037, driven primarily by energy_code_gap
Infrastructure: 0.438% avg pipe failure probability, 70% of ZIPs at high risk
80.2% 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: $1,037
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
5,502 housing units in Ontonagon 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 Ontonagon County
Water safety remediation is a moderate expense relative to home values. Most homeowners can address issues through staged improvements over time.
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 Ontonagon 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 Ontonagon County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | INTERIOR TOWNSHIP | 200 | 6 |
| 2 | ROCKLAND TOWNSHIP | 350 | 5 |
| 3 | Ontonagon | 2,607 | 1 |
| 4 | Bergland Township | 210 | 0 |
| 5 | MCMILLAN TOWNSHIP | 391 | 0 |
All ZIP Codes in Ontonagon County
10 ZIP codes tracked in Ontonagon County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 49910 | Bergland | 99 | A | 0 | $303K |
| 2 | 49967 | Trout Creek | 96 | A | 6 | $91K |
| 3 | 49925 | Ewen | 88 | A | 0 | $117K |
| 4 | 49953 | Ontonagon | 87 | A | 1 | $103K |
| 5 | 49912 | Bruce Crossing | 66 | C | 0 | $114K |
| 6 | 49929 | Greenland | 66 | C | 0 | $59K |
| 7 | 49948 | Mass City | 66 | C | 0 | $100K |
| 8 | 49961 | Sidnaw | 66 | C | 0 | $84K |
| 9 | 49971 | White Pine | 66 | C | 0 | $60K |
| 10 | 49960 | Rockland | 62 | C | 5 | $60K |
Recommended Buyer Guides for Ontonagon County
Designed to find the guide that fits the county, not the other way around — the system reads EPA detections, FEMA hazard layers, and CDC lead-exposure markers, then outputs the categories that resolve those specific risks for households here, with NSF-certified products surfaced when the matching contaminant appears in the local monitoring data.
- Best Lead Paint Test Kits — 80.2% of homes built before 1978
Deep Dive Reports
Detailed analysis for Ontonagon County, Michigan
Overview
Ontonagon County in Michigan covers 10 ZIP codes with an average Home Safety Score of B (76/100).
3 of 10 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to Michigan 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.