States › Illinois › McDonough County

McDonough County, IL Water Quality

Water quality data for 11 public water systems serving McDonough County, Illinois — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 11 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

McDonough County Earns a B

McDonough County: 11 communities across 11 water systems. 100.0% have no open violations.

  • Median lead where detected: 1.30 ppb
  • 1 communities with a lead detection, 10 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 4 with significant inspection deficiencies
  • 100.0% of communities have no open violations
1.3 ppb
Median Lead Level
County-wide, 90th percentile
11
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
  • Colchester
    Not detected
    No federal limits exceeded on record
    B
  • Blandinsville
    1.30 ppb
    No federal limits exceeded on record
    A
  • Prairie City
    Not detected
    No federal limits exceeded on record
    B
  • Industry
    Not detected
    2 health-based violations since 2015
    B
  • Bardolph
    Not detected
    2 health-based violations since 2015
    B
⚠ Needs Attention
  • Adair
    Not detected
    1 significant inspection deficiency
    C
  • Bushnell
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Good Hope
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Sciota
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Macomb
    Not detected
    4 health-based violations since 2015
    B
County Lead Level — Median 1.3 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.3 ppb — 8.7% of the federal action level
Systems by Lead Level
Under 5 ppb
1
No Data
10

All Cities in McDonough County

Macomb Not detected B
Bushnell Not detected B
Colchester Not detected B
Blandinsville 1.30 ppb A
Industry Not detected B
Prairie City Not detected B
Good Hope Not detected B
Bardolph Not detected B
Adair Not detected C
Tennessee Not detected B
Sciota Not detected B
Showing 11 cities
No active violations Active violations

About McDonough County Drinking Water

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

Of the communities reporting lead results, 1 recorded a detection, with a median of 1.30 ppb — 9% of the federal action level. 10 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 4 of them.

Frequently Asked Questions

Is McDonough County tap water safe to drink?▼
No community in McDonough County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in McDonough County?▼
Among communities with a detection the median is 1.30 ppb, 9% of the 15 ppb action level. 10 reported none detected and 0 reported no result.
How many water systems serve McDonough County?▼
11 community water systems serve 11 communities here.
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