Sanilac County, Michigan
17 ZIP codes · Avg score 73/100 · Grade B · Updated 2026-06-03
Spanning 17 ZIP codes, Sanilac County posts strong drinking water compliance — most systems have never triggered a health-based notice.
How Sanilac County Compares
How Sanilac County Compares
Sanilac County scores 1 points below the Michigan state average (74/100) and 5 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Sanilac County, Michigan
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.7 (asthma 11.6%, diabetes 13.8%)
Estimated additional annual cost per homeowner: $862, driven primarily by energy_code_gap
Infrastructure: 0.422% avg pipe failure probability, 71% of ZIPs at high risk
74.5% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across Sanilac County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 3 violations. Past 5 years: 4 total (4 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: $862
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
21,604 housing units in Sanilac 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 Sanilac County
Remediation costs are relatively manageable for most homeowners in Sanilac 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 Sanilac 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 Sanilac County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Sandusky, | 2,679 | 8 |
| 2 | Sanilac Township | 674 | 8 |
| 3 | Port Sanilac, Village of | 623 | 8 |
| 4 | City of Croswell, | 2,447 | 8 |
| 5 | Worth Township | 3,854 | 6 |
19 total water systems serve Sanilac County.
All ZIP Codes in Sanilac County
17 ZIP codes tracked in Sanilac County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 48434 | Forestville | 83 | B | 0 | $134K |
| 2 | 48453 | Marlette | 83 | B | 0 | $157K |
| 3 | 48422 | Croswell | 82 | B | 2 | $162K |
| 4 | 48426 | Decker | 82 | B | 2 (1 health) | $120K |
| 5 | 48416 | Brown City | 81 | B | 2 | $213K |
| 6 | 48469 | Port Sanilac | 81 | B | 4 | $167K |
| 7 | 48401 | Applegate | 80 | B | 3 | $161K |
| 8 | 48427 | Deckerville | 80 | B | 3 | $133K |
| 9 | 48450 | Lexington | 80 | B | 6 | $201K |
| 10 | 48456 | Minden City | 77 | B | 4 | $146K |
| 11 | 48419 | Carsonville | 72 | B | 1 | $180K |
| 12 | 48466 | Peck | 72 | B | 0 | $136K |
| 13 | 48471 | Sandusky | 72 | B | 1 | $130K |
| 14 | 48410 | Argyle | 53 | D | 0 | $107K |
| 15 | 48465 | Palms | 53 | D | 0 | $175K |
| 16 | 48470 | Ruth | 53 | D | 0 | $179K |
| 17 | 48472 | Snover | 53 | D | 0 | $154K |
Recommended Buyer Guides for Sanilac County
Filtered against EPA monitoring data and CDC lead-exposure guidance, the guides below skip the generic catalog and connect directly to the contaminants and hazards on file here.
- Best Lead Paint Test Kits — 74.5% of homes built before 1978
Deep Dive Reports
Detailed analysis for Sanilac County, Michigan
Overview
Sanilac County in Michigan covers 17 ZIP codes with an average Home Safety Score of B (73/100).
10 of 17 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.