States › Illinois › Shelby County

Shelby County, IL Water Quality

Water quality data for 6 public water systems serving Shelby County, Illinois — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 6 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

Shelby County Earns a B

Shelby County: 13 communities across 6 water systems. 84.6% have no open violations.

  • Median lead where detected: 4.35 ppb
  • 2 communities with a lead detection, 11 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 4 with significant inspection deficiencies
  • 84.6% of communities have no open violations
4.35 ppb
Median Lead Level
County-wide, 90th percentile
6
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
  • Windsor
    Not detected
    1 health-based violation since 2015
    A
  • Strasburg
    Not detected
    1 health-based violation since 2015
    A
  • Stewardson
    Not detected
    1 health-based violation since 2015
    A
  • Tower Hill
    Not detected
    1 health-based violation since 2015
    A
  • Sigel
    Not detected
    1 health-based violation since 2015
    A
⚠ Needs Attention
  • Herrick
    3.10 ppb
    Copper above the 1,300 ppb action level
    F
  • Findlay
    Not detected
    Copper above the 1,300 ppb action level
    D
  • Shelbyville
    Not detected
    3 significant inspection deficiencies
    B
  • Moweaqua
    Not detected
    1 significant inspection deficiency
    B
  • Cowden
    5.60 ppb
    Lead at 5.60 ppb, above a third of the action level
    B
County Lead Level — Median 4.35 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 4.35 ppb — 29% of the federal action level
Systems by Lead Level
Under 5 ppb
1
5 – 10 ppb
1
No Data
11

All Cities in Shelby County

Shelbyville Not detected B
Moweaqua Not detected B
Findlay Not detected D
Windsor Not detected A
Strasburg Not detected A
Cowden 5.60 ppb B
Stewardson Not detected A
Herrick 3.10 ppb F
Tower Hill Not detected A
Sigel Not detected A
Oconee Not detected A
Westervelt Not detected A
Lakewood Not detected A
Showing 13 cities
No active violations Active violations

About Shelby County Drinking Water

Shelby County is served by 6 water systems covering 13 communities. 85% have no open violations.

Of the communities reporting lead results, 2 recorded a detection, with a median of 4.35 ppb — 29% of the federal action level. 11 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 Shelby 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 Shelby County?▼
Among communities with a detection the median is 4.35 ppb, 29% of the 15 ppb action level. 11 reported none detected and 0 reported no result.
How many water systems serve Shelby County?▼
6 community water systems serve 13 communities here.
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