States › Indiana › Lake County

Lake County, IN Water Quality

Water quality data for 17 public water systems serving Lake County, Indiana — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 17 water systems · 21 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Lake County Earns a A

Lake County: 21 communities across 17 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.70 ppb
  • 19 communities with a lead detection, 2 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 3 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2.7 ppb
Median Lead Level
County-wide, 90th percentile
17
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
  • Gary
    3.00 ppb
    No federal limits exceeded on record
    A
  • Merrillville
    3.00 ppb
    No federal limits exceeded on record
    A
  • Crown Point
    0.70 ppb
    No federal limits exceeded on record
    A
  • Schererville
    1.00 ppb
    No federal limits exceeded on record
    A
  • Hobart
    3.00 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Cedar Lake
    1.10 ppb
    1 significant inspection deficiency
    B
  • Lake Dalecarlia
    Not detected
    2 significant inspection deficiencies
    B
  • East Chicago
    8.00 ppb
    1 health-based violation since 2015
    B
  • Lowell
    1.00 ppb
    5 health-based violations since 2015
    B
  • Griffith
    1.01 ppb
    1 significant inspection deficiency
    A
County Lead Level — Median 2.7 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.7 ppb — 18% of the federal action level
Systems by Lead Level
Under 5 ppb
17
5 – 10 ppb
2
No Data
2

All Cities in Lake County

Hammond 3.00 ppb A
Gary 3.00 ppb A
Merrillville 3.00 ppb A
Crown Point 0.70 ppb A
Schererville 1.00 ppb A
Hobart 3.00 ppb A
East Chicago 8.00 ppb B
Munster 2.00 ppb A
Highland 2.40 ppb A
St. John 2.70 ppb A
Dyer 7.70 ppb A
Griffith 1.01 ppb A
Lowell 1.00 ppb B
Cedar Lake 1.10 ppb B
Lake Station 3.00 ppb A
Lakes of the Four Seasons 2.30 ppb A
Whiting 3.70 ppb A
Winfield 3.00 ppb A
New Chicago Not detected A
Lake Dalecarlia Not detected B
Schneider 0.30 ppb B
Showing 21 cities
No active violations Active violations

About Lake County Drinking Water

Lake County is served by 17 water systems covering 21 communities. No community here has an open violation on record.

Of the communities reporting lead results, 19 recorded a detection, with a median of 2.70 ppb — 18% of the federal action level. 2 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded significant deficiencies at 3 of them.

Frequently Asked Questions

Is Lake County tap water safe to drink?▼
No community in Lake County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Lake County?▼
Among communities with a detection the median is 2.70 ppb, 18% of the 15 ppb action level. 2 reported none detected and 0 reported no result.
How many water systems serve Lake County?▼
17 community water systems serve 21 communities here.
← Back to Indiana water quality overview