States › Illinois › Hamilton County

Hamilton County, IL Water Quality

Water quality data for 3 public water systems serving Hamilton County, Illinois — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 3 water systems · 3 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

Hamilton County Earns a B

Hamilton County: 3 communities across 3 water systems. 66.7% have no open violations.

  • Median lead where detected: none detected
  • 0 communities with a lead detection, 3 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 2 with significant inspection deficiencies
  • 66.7% of communities have no open violations
—
Median Lead Level
County-wide, 90th percentile
3
Water Systems
Active CWS & NTNCWS
66%
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
  • Dahlgren
    Not detected
    No federal limits exceeded on record
    B
  • Broughton
    Not detected
    1 significant inspection deficiency
    A
  • McLeansboro
    Not detected
    1 violation currently open
    D
⚠ Needs Attention
  • McLeansboro
    Not detected
    1 violation currently open
    D
  • Broughton
    Not detected
    1 significant inspection deficiency
    A
  • Dahlgren
    Not detected
    No federal limits exceeded on record
    B

All Cities in Hamilton County

McLeansboro Not detected D
Dahlgren Not detected B
Broughton Not detected A
Showing 3 cities
No active violations Active violations

About Hamilton County Drinking Water

Hamilton County is served by 3 water systems covering 3 communities. 67% have no open violations.

Lead was not detected in any community in Hamilton County that reported a result.

No community here has PFAS above the federal limit on record. State inspectors recorded significant deficiencies at 2 of them.

Frequently Asked Questions

Is Hamilton County tap water safe to drink?▼
67% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Hamilton County?▼
No community reported a lead detection.
How many water systems serve Hamilton County?▼
3 community water systems serve 3 communities here.
← Back to Illinois water quality overview