St. Joseph County, Michigan
10 ZIP codes · Avg score 59/100 · Grade C · Updated 2026-06-03
Current EPA records place St. Joseph County in the middle tier for drinking water safety, with 10 ZIP codes showing a range of outcomes.
How St. Joseph County Compares
How St. Joseph County Compares
St. Joseph County scores 15 points below the Michigan state average (74/100) and 9 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: St. Joseph County, Michigan
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.7 (asthma 11.6%, diabetes 12.8%)
Estimated additional annual cost per homeowner: $1,124, driven primarily by energy_code_gap
Infrastructure: 0.425% avg pipe failure probability, 80% of ZIPs at high risk
74.3% 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: $1,124
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
26,550 housing units in St. Joseph 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. Joseph County
Remediation costs are relatively manageable for most homeowners in St. Joseph 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. Joseph 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 St. Joseph County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Centreville | 1,579 | 14 |
| 2 | Colon | 1,190 | 7 |
| 3 | Lockport Township | 1,778 | 7 |
| 4 | Mendon | 920 | 7 |
| 5 | Constantine | 2,075 | 6 |
14 total water systems serve St. Joseph County.
All ZIP Codes in St. Joseph County
10 ZIP codes tracked in St. Joseph County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 49091 | Sturgis | 70 | B | 0 | $174K |
| 2 | 49099 | White Pigeon | 70 | B | 1 | $172K |
| 3 | 49032 | Centreville | 69 | C | 4 (1 health) | $160K |
| 4 | 49030 | Burr Oak | 61 | C | 3 | $119K |
| 5 | 49072 | Mendon | 61 | C | 7 | $169K |
| 6 | 49075 | Nottawa | 61 | C | 5 | $63K |
| 7 | 49042 | Constantine | 60 | C | 2 | $162K |
| 8 | 49093 | Three Rivers | 54 | D | 3 | $174K |
| 9 | 49066 | Leonidas | 40 | D | 0 | $188K |
| 10 | 49089 | Sherwood | 40 | D | 0 | $121K |
Recommended Buyer Guides for St. Joseph 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 — 74.3% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for St. Joseph County, Michigan
Overview
St. Joseph County in Michigan covers 10 ZIP codes with an average Home Safety Score of C (59/100).
7 of 10 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.