Shiawassee County, Michigan
9 ZIP codes · Avg score 65/100 · Grade C · Updated 2026-07-19
ZipCheckup grade for Shiawassee: C.
A mixed picture - some signals here are worth your attention.
Water systems across Shiawassee County's 9 ZIP codes produce average compliance results overall - pockets with documented violations exist, and the variation between areas makes ZIP-level lookup the most useful tool for residents here.
How Shiawassee County Compares
How Shiawassee County Compares
Shiawassee County scores 9 points below the Michigan state average (74/100) and 3 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-07-19
ZIP Code Risk Map
Water Quality Map: Shiawassee County, Michigan
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.3 (asthma 11.5%, diabetes 12.2%)
Estimated additional annual cost per homeowner: $1,146, driven primarily by flood
Infrastructure: 0.45% avg pipe failure probability, 44% of ZIPs at high risk
73.6% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
→ Stable trendEPA violation counts by year across Shiawassee County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 10 violations. Past 5 years: 13 total (13 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: $1,146
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
22,451 housing units in Shiawassee 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 Shiawassee County
Remediation costs are relatively manageable for most homeowners in Shiawassee 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 Shiawassee County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Shiawassee County
8 community water systems serving Shiawassee County.
- C
- D
- D
- C
- B
- B
Show all 8 water systems
- D
- C
12 total water systems serve Shiawassee County.
Systems with the most violations in Shiawassee County
4 water systems with recorded EPA violations.
- C
- B
- B
- D
All ZIP Codes in Shiawassee County
9 ZIP codes tracked in Shiawassee County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 48872 | Perry | 83 | B | 1 | $218K |
| 2 | 48418 | Byron | 80 | B | 4 (3 health) | $247K |
| 3 | 48817 | Corunna | 75 | B | 0 | $164K |
| 4 | 48414 | Bancroft | 71 | B | 5 (1 health) | $183K |
| 5 | 48867 | Owosso | 60 | C | 5 (3 health) | $146K |
| 6 | 48476 | Vernon | 53 | D | 0 | $122K |
| 7 | 48816 | Cohoctah | 53 | D | 0 | $138K |
| 8 | 48857 | Morrice | 53 | D | 0 | $130K |
| 9 | 48882 | Shaftsburg | 53 | D | 0 | — |
Recommended Buyer Guides for Shiawassee 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 — 73.6% 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 Shiawassee County, Michigan
Overview
Shiawassee County in Michigan covers 9 ZIP codes with an average Home Safety Score of C (65/100).
4 of 9 ZIP codes have recorded EPA violations. 7 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.