States › Illinois › Sangamon County

Sangamon County, IL Water Quality

Water quality data for 16 public water systems serving Sangamon County, Illinois — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 16 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

Sangamon County Earns a A

Sangamon County: 21 communities across 16 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 3 communities with a lead detection, 18 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 6 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2 ppb
Median Lead Level
County-wide, 90th percentile
16
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
  • Springfield
    Not detected
    No federal limits exceeded on record
    A
  • Chatham
    Not detected
    No federal limits exceeded on record
    A
  • Auburn
    Not detected
    No federal limits exceeded on record
    A
  • Rochester
    Not detected
    No federal limits exceeded on record
    A
  • Pawnee
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Mechanicsburg
    Not detected
    5 significant inspection deficiencies
    B
  • Buffalo
    Not detected
    5 significant inspection deficiencies
    B
  • New Berlin
    Not detected
    2 significant inspection deficiencies
    B
  • Illiopolis
    Not detected
    4 health-based violations since 2015
    B
  • Sherman
    Not detected
    1 significant inspection deficiency
    A
County Lead Level — Median 2 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2 ppb — 13.3% of the federal action level
Systems by Lead Level
Under 5 ppb
3
No Data
18

All Cities in Sangamon County

Springfield Not detected A
Chatham Not detected A
Auburn Not detected A
Rochester Not detected A
Sherman Not detected A
Riverton 2.00 ppb A
Pawnee Not detected B
Jerome Not detected B
Southern View Not detected A
Grandview Not detected B
Leland Grove Not detected A
New Berlin Not detected B
Williamsville Not detected A
Divernon Not detected B
Illiopolis Not detected B
Loami 1.50 ppb B
Pleasant Plains Not detected B
Spaulding 2.00 ppb A
Thayer Not detected B
Mechanicsburg Not detected B
Buffalo Not detected B
Showing 21 cities
No active violations Active violations

About Sangamon County Drinking Water

Sangamon County is served by 16 water systems covering 21 communities. No community here has an open violation on record.

Of the communities reporting lead results, 3 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 18 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 6 of them.

Frequently Asked Questions

Is Sangamon County tap water safe to drink?▼
No community in Sangamon County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Sangamon County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 18 reported none detected and 0 reported no result.
How many water systems serve Sangamon County?▼
16 community water systems serve 21 communities here.
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