States › Indiana › St. Joseph County

St. Joseph County, IN Water Quality

Water quality data for 7 public water systems serving St. Joseph County, Indiana — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 7 water systems · 11 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

St. Joseph County Earns a B

St. Joseph County: 11 communities across 7 water systems. 100.0% have no open violations.

  • Median lead where detected: 6.10 ppb
  • 10 communities with a lead detection, 1 reporting none detected
  • 3 communities with PFAS above the federal limit
  • 2 with significant inspection deficiencies
  • 100.0% of communities have no open violations
6.1 ppb
Median Lead Level
County-wide, 90th percentile
7
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • North Liberty
    1.42 ppb
    No federal limits exceeded on record
    B
  • Lakeville
    0.82 ppb
    No federal limits exceeded on record
    B
  • Mishawaka
    8.90 ppb
    Lead at 8.90 ppb, above a third of the action level
    A
  • Osceola
    8.90 ppb
    Lead at 8.90 ppb, above a third of the action level
    A
  • New Carlisle
    Not detected
    1 significant inspection deficiency
    B
⚠ Needs Attention
  • South Bend
    4.70 ppb
    PFAS above the limit at 1 of 9 sampling points
    B
  • Granger
    4.70 ppb
    PFAS above the limit at 1 of 9 sampling points
    B
  • Roseland
    4.70 ppb
    PFAS above the limit at 1 of 9 sampling points
    B
  • Walkerton
    8.20 ppb
    1 significant inspection deficiency
    B
  • Notre Dame
    7.50 ppb
    1 health-based violation since 2015
    B
County Lead Level — Median 6.1 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 6.1 ppb — 40.7% of the federal action level
Systems by Lead Level
Under 5 ppb
5
5 – 10 ppb
5
No Data
1

All Cities in St. Joseph County

South Bend 4.70 ppb B
Mishawaka 8.90 ppb A
Notre Dame 7.50 ppb B
Granger 4.70 ppb B
Walkerton 8.20 ppb B
New Carlisle Not detected B
North Liberty 1.42 ppb B
Osceola 8.90 ppb A
Lakeville 0.82 ppb B
Roseland 4.70 ppb B
Indian Village 7.50 ppb B
Showing 11 cities
No active violations Active violations

About St. Joseph County Drinking Water

St. Joseph County is served by 7 water systems covering 11 communities. No community here has an open violation on record.

Of the communities reporting lead results, 10 recorded a detection, with a median of 6.10 ppb — 41% of the federal action level. 1 reported none detected, which means below the laboratory limit rather than an absence of lead.

3 of 11 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded significant deficiencies at 2 of them.

Frequently Asked Questions

Is St. Joseph County tap water safe to drink?▼
No community in St. Joseph County has an open violation on record. 3 of 11 have PFAS above the federal limit, which is the main open concern.
What is the lead level in St. Joseph County?▼
Among communities with a detection the median is 6.10 ppb, 41% of the 15 ppb action level. 1 reported none detected and 0 reported no result.
How many water systems serve St. Joseph County?▼
7 community water systems serve 11 communities here.
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