Iosco County, Michigan
11 ZIP codes · Avg score 80/100 · Grade B · Updated 2026-06-03
In current tracking cycles, Iosco County — spanning 11 ZIP codes — records above-average water quality outcomes; the county's compliance history over recent years shows few departures from federal standards.
How Iosco County Compares
How Iosco County Compares
Iosco County scores 6 points above the Michigan state average (74/100) and 12 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Iosco County, Michigan
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 17 (asthma 11.5%, diabetes 15.9%)
Estimated additional annual cost per homeowner: $1,244, driven primarily by energy_code_gap
Infrastructure: 0.384% avg pipe failure probability, 18% of ZIPs at high risk
75.7% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across Iosco County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 2 violations. Past 5 years: 3 total (3 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: $1,244
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
24,674 housing units in Iosco 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 Iosco County
Remediation costs are relatively manageable for most homeowners in Iosco 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 Iosco 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 Iosco County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | OSCODA TOWNSHIP | 6,997 | 23 |
| 2 | Au Sable Township | 2,370 | 23 |
| 3 | Hale Homestead Apartments | 72 | 23 |
| 4 | City of Tawas City, | 1,827 | 4 |
| 5 | HALE CREEK MANOR | 43 | 4 |
11 total water systems serve Iosco County.
All ZIP Codes in Iosco County
11 ZIP codes tracked in Iosco County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 48739 | Hale | 97 | A | 4 | $171K |
| 2 | 48764 | Tawas City | 97 | A | 2 | — |
| 3 | 48730 | East Tawas | 90 | A | 0 | $140K |
| 4 | 48763 | Tawas City | 88 | A | 2 | $154K |
| 5 | 48770 | Whittemore | 88 | A | 1 | $101K |
| 6 | 48750 | Oscoda | 87 | A | 23 (3 health) | $111K |
| 7 | 48738 | Greenbush | 73 | B | 0 | $154K |
| 8 | 48737 | Glennie | 66 | C | 0 | $121K |
| 9 | 48743 | Long Lake | 66 | C | 0 | — |
| 10 | 48748 | National City | 66 | C | 0 | $143K |
| 11 | 48761 | South Branch | 66 | C | 0 | $113K |
Recommended Buyer Guides for Iosco 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 — 75.7% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Iosco County, Michigan
Overview
Iosco County in Michigan covers 11 ZIP codes with an average Home Safety Score of B (80/100).
5 of 11 ZIP codes have recorded EPA violations. 3 health-based violations 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.