St. Clair County, Michigan
20 ZIP codes · Avg score 98/100 · Grade A · Updated
ZipCheckup grade for St. Clair County: A.
No federal data flags a major home-safety concern for this ZIP.
Based on current EPA data, St. Clair County's 20 ZIP codes maintain an above-average drinking water safety record.
How St. Clair County Compares
How St. Clair County Compares
St. Clair County scores 13 points above the Michigan state average (85/100) and 25 points above the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:
ZIP Code Risk Map
Water Quality Map: St. Clair County, Michigan
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.4 (asthma 11.7%, diabetes 12.2%)
Estimated additional annual cost per homeowner: $1,742, driven primarily by flood
60.8% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across St. Clair County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 3 violations. Past 5 years: 6 total (6 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
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,742
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
67,746 housing units in St. Clair 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 St. Clair County
Remediation costs are relatively manageable for most homeowners in St. Clair 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 St. Clair County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving St. Clair County
8 community water systems serving St. Clair County.
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Show all 8 water systems
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20 total water systems serve St. Clair County.
Systems with the most violations in St. Clair County
5 water systems with recorded EPA violations.
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All ZIP Codes in St. Clair County
20 ZIP codes tracked in St. Clair County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 48023 | Fair Haven | 100 | A | 0 | $237K |
| 2 | 48040 | Marysville | 100 | A | 0 | $186K |
| 3 | 48001 | Algonac | 99 | A | 2 | $250K |
| 4 | 48039 | Marine City | 98 | A | 4 (1 health) | $171K |
| 5 | 48049 | North Street | 98 | A | 3 | $226K |
| 6 | 48059 | Fort Gratiot | 98 | A | 5 | $199K |
| 7 | 48060 | Port Huron | 98 | A | 3 | $152K |
| 8 | 48079 | Saint Clair | 98 | A | 5 (1 health) | $277K |
| 9 | 48074 | Smiths Creek | 93 | A | 14 | $192K |
| 10 | 48002 | Allenton | — | — | $295K | |
| 11 | 48004 | Anchorville | — | — | — | |
| 12 | 48006 | Avoca | — | — | $226K | |
| 13 | 48014 | Capac | — | — | 6 | $208K |
| 14 | 48027 | Goodells | — | — | $243K | |
| 15 | 48028 | Harsens Island | — | — | $339K | |
| 16 | 48041 | Memphis | — | — | 0 | $296K |
| 17 | 48061 | Port Huron | — | — | — | |
| 18 | 48063 | Columbus | — | — | 0 | $298K |
| 19 | 48064 | Casco | — | — | $280K | |
| 20 | 48097 | Yale | — | — | 7 (1 health) | $175K |
Recommended Buyer Guides for St. Clair County
While many sites publish identical guide lists across every county they cover, the selection here changes by location - driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Lead Paint Test Kits — 60.8% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for St. Clair County, Michigan
Overview
St. Clair County in Michigan covers 20 tracked ZIP records with an average Home Safety Score of A (98/100) across 9 scored records.
9 of 13 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 3 health-based violations appear in the available health breakdown.
← Back to Michigan Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.