States › Illinois › McLean County

McLean County, IL Water Quality

Water quality data for 22 public water systems serving McLean County, Illinois — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 22 water systems · 22 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

McLean County Earns a B

McLean County: 22 communities across 22 water systems. 100.0% have no open violations.

  • Median lead where detected: 5.50 ppb
  • 9 communities with a lead detection, 13 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 17 with significant inspection deficiencies
  • 100.0% of communities have no open violations
5.5 ppb
Median Lead Level
County-wide, 90th percentile
22
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
  • Bloomington
    0.60 ppb
    No federal limits exceeded on record
    A
  • Hudson
    Not detected
    No federal limits exceeded on record
    B
  • McLean
    Not detected
    No federal limits exceeded on record
    B
  • Twin Grove
    8.46 ppb
    Lead at 8.46 ppb, above a third of the action level
    B
  • Heyworth
    Not detected
    2 significant inspection deficiencies
    B
⚠ Needs Attention
  • Le Roy
    49.00 ppb
    Lead above the 15 ppb action level
    D
  • Chenoa
    Not detected
    Copper above the 1,300 ppb action level
    D
  • Colfax
    10.70 ppb
    Copper above the 1,300 ppb action level
    C
  • Gridley
    Not detected
    Copper above the 1,300 ppb action level
    C
  • Danvers
    Not detected
    Copper above the 1,300 ppb action level
    C
County Lead Level — Median 5.5 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 5.5 ppb — 36.7% of the federal action level
Systems by Lead Level
Under 5 ppb
4
5 – 10 ppb
2
10 – 15 ppb
3
No Data
13

All Cities in McLean County

Bloomington 0.60 ppb A
Normal 5.50 ppb B
Le Roy 49.00 ppb D
Heyworth Not detected B
Lexington Not detected C
Hudson Not detected B
Chenoa Not detected D
Gridley Not detected C
Danvers Not detected C
Colfax 10.70 ppb C
Downs Not detected C
McLean Not detected B
Saybrook Not detected B
Twin Grove 8.46 ppb B
Stanford 1.30 ppb B
Carlock Not detected C
Towanda Not detected B
Arrowsmith Not detected B
Bellflower Not detected B
Ellsworth 1.70 ppb C
Anchor 13.50 ppb C
Cooksville 1.00 ppb C
Showing 22 cities
No active violations Active violations

About McLean County Drinking Water

McLean County is served by 22 water systems covering 22 communities. No community here has an open violation on record.

Of the communities reporting lead results, 9 recorded a detection, with a median of 5.50 ppb — 37% of the federal action level. 13 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 17 of them.

Frequently Asked Questions

Is McLean County tap water safe to drink?▼
No community in McLean County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in McLean County?▼
Among communities with a detection the median is 5.50 ppb, 37% of the 15 ppb action level. 13 reported none detected and 0 reported no result.
How many water systems serve McLean County?▼
22 community water systems serve 22 communities here.
← Back to Illinois water quality overview