States › Illinois › Macon County

Macon County, IL Water Quality

Water quality data for 12 public water systems serving Macon County, Illinois — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 12 water systems · 13 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

Macon County Earns a B

Macon County: 13 communities across 12 water systems. 84.6% have no open violations.

  • Median lead where detected: 2.60 ppb
  • 7 communities with a lead detection, 6 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 5 with significant inspection deficiencies
  • 84.6% of communities have no open violations
2.6 ppb
Median Lead Level
County-wide, 90th percentile
12
Water Systems
Active CWS & NTNCWS
84%
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
  • Decatur
    2.60 ppb
    No federal limits exceeded on record
    A
  • Long Creek
    2.80 ppb
    No federal limits exceeded on record
    A
  • Niantic
    Not detected
    No federal limits exceeded on record
    B
  • Elwin
    2.60 ppb
    No federal limits exceeded on record
    A
  • Maroa
    Not detected
    Copper above the 1,300 ppb action level
    B
⚠ Needs Attention
  • Warrensburg
    7.00 ppb
    Copper above the 1,300 ppb action level
    D
  • Blue Mound
    Not detected
    1 violation currently open
    D
  • Forsyth
    Not detected
    Copper above the 1,300 ppb action level
    C
  • Argenta
    Not detected
    Copper above the 1,300 ppb action level
    C
  • Mount Zion
    1.50 ppb
    1 significant inspection deficiency
    C
County Lead Level — Median 2.6 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.6 ppb — 17.3% of the federal action level
Systems by Lead Level
Under 5 ppb
6
5 – 10 ppb
1
No Data
6

All Cities in Macon County

Decatur 2.60 ppb A
Mount Zion 1.50 ppb C
Forsyth Not detected C
Maroa Not detected B
Harristown Not detected B
Long Creek 2.80 ppb A
Blue Mound Not detected D
Warrensburg 7.00 ppb D
Oreana 2.53 ppb B
Argenta Not detected C
Macon 2.20 ppb B
Niantic Not detected B
Elwin 2.60 ppb A
Showing 13 cities
No active violations Active violations

About Macon County Drinking Water

Macon County is served by 12 water systems covering 13 communities. 85% have no open violations.

Of the communities reporting lead results, 7 recorded a detection, with a median of 2.60 ppb — 17% of the federal action level. 6 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 5 of them.

Frequently Asked Questions

Is Macon County tap water safe to drink?▼
85% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Macon County?▼
Among communities with a detection the median is 2.60 ppb, 17% of the 15 ppb action level. 6 reported none detected and 0 reported no result.
How many water systems serve Macon County?▼
12 community water systems serve 13 communities here.
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