Keweenaw County, Michigan
4 ZIP codes · Avg score 68/100 · Grade C · Updated 2026-06-03
Keweenaw County's water quality grade reflects a middle-ground assessment — its 4 ZIP codes range from fully compliant to violation-flagged.
How Keweenaw County Compares
How Keweenaw County Compares
Keweenaw County scores 6 points below the Michigan state average (74/100) and 0 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
Key Risk Factors
Health risk index: 14.8 (asthma 10.6%, diabetes 13.4%)
Estimated additional annual cost per homeowner: $698, driven primarily by energy_code_gap
Infrastructure: 0.41% avg pipe failure probability, 75% of ZIPs at high risk
70.8% 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: $698
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
1,937 housing units in Keweenaw 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 Keweenaw County
Remediation costs are relatively manageable for most homeowners in Keweenaw 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 Keweenaw County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
All ZIP Codes in Keweenaw County
4 ZIP codes tracked in Keweenaw County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 49901 | Ahmeek | 83 | B | 0 | $75K |
| 2 | 49918 | Copper Harbor | 82 | B | 2 (1 health) | $285K |
| 3 | 49805 | Allouez | 53 | D | 0 | $116K |
| 4 | 49950 | Mohawk | 53 | D | 0 | $222K |
Recommended Buyer Guides for Keweenaw County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Lead Paint Test Kits — 70.8% of homes built before 1978
Overview
Keweenaw County in Michigan covers 4 ZIP codes with an average Home Safety Score of C (68/100).
1 of 4 ZIP codes have recorded EPA violations. 1 health-based violation have been documented.
← 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.