St. Joseph County, Indiana
27 ZIP codes · Avg score 59/100 · Grade C · Updated 2026-06-03
The systems supplying St. Joseph County's 27 ZIP codes vary in performance — most meet minimum standards, but violations in select areas are on record.
How St. Joseph County Compares
How St. Joseph County Compares
St. Joseph County scores 1 points below the Indiana state average (60/100) 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, Indiana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.5 (asthma 11.1%, diabetes 13%)
Estimated additional annual cost per homeowner: $1,135, driven primarily by sea_level
Infrastructure: 0.425% avg pipe failure probability, 56% of ZIPs at high risk
70.3% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across St. Joseph County water systems. Health-based shown in red, total in blue.
Peak year: 2021 with 17 violations. Past 5 years: 34 total (34 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: $1,135
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
113,630 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 | South Bend Water Works | 115,000 | 267 |
| 2 | Clearwater Village Mobile Home Park | 400 | 238 |
| 3 | Sunset Village & Rv Park | 25 | 238 |
| 4 | Mishawaka Utilities | 49,675 | 57 |
| 5 | University of Notre Dame | 7,400 | 32 |
16 total water systems serve St. Joseph County.
All ZIP Codes in St. Joseph County
27 ZIP codes tracked in St. Joseph County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 46530 | Granger | 69 | C | 3 | $317K |
| 2 | 46554 | North Liberty | 68 | C | 2 | $189K |
| 3 | 46601 | South Bend | 65 | C | 14 (2 health) | $132K |
| 4 | 46615 | South Bend | 65 | C | 14 (2 health) | $128K |
| 5 | 46617 | South Bend | 65 | C | 14 (2 health) | $231K |
| 6 | 46619 | South Bend | 65 | C | 14 (2 health) | $98K |
| 7 | 46536 | Lakeville | 64 | C | 2 | $208K |
| 8 | 46552 | New Carlisle | 60 | C | 12 | $212K |
| 9 | 46604 | South Bend | 60 | C | 14 (2 health) | — |
| 10 | 46613 | South Bend | 60 | C | 14 (2 health) | $71K |
| 11 | 46614 | South Bend | 60 | C | 14 (2 health) | $175K |
| 12 | 46616 | South Bend | 60 | C | 14 (2 health) | $136K |
| 13 | 46624 | South Bend | 60 | C | 14 (2 health) | — |
| 14 | 46626 | South Bend | 60 | C | 14 (2 health) | — |
| 15 | 46628 | South Bend | 60 | C | 14 (2 health) | $165K |
| 16 | 46634 | South Bend | 60 | C | 14 (2 health) | — |
| 17 | 46635 | South Bend | 60 | C | 14 (2 health) | $193K |
| 18 | 46637 | South Bend | 60 | C | 14 (2 health) | $192K |
| 19 | 46660 | South Bend | 60 | C | 14 (2 health) | — |
| 20 | 46680 | South Bend | 60 | C | 14 (2 health) | — |
| 21 | 46699 | South Bend | 60 | C | 14 (2 health) | — |
| 22 | 46556 | Notre Dame | 55 | C | 4 | — |
| 23 | 46544 | Mishawaka | 50 | D | 4 | $151K |
| 24 | 46545 | Mishawaka | 50 | D | 4 | $175K |
| 25 | 46546 | Mishawaka | 48 | D | 4 | — |
| 26 | 46365 | Mill Creek | 40 | D | 0 | $178K |
| 27 | 46595 | Wyatt | 40 | D | 0 | — |
Recommended Buyer Guides for St. Joseph County
Eight risk categories drive the selection — PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback — and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- Best Lead Paint Test Kits — 70.3% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for St. Joseph County, Indiana
Overview
St. Joseph County in Indiana covers 27 ZIP codes with an average Home Safety Score of C (59/100).
25 of 27 ZIP codes have recorded EPA violations. 34 health-based violations have been documented.
← Back to Indiana 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.