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Ogle County, IL Water Quality

Water quality data for 14 public water systems serving Ogle County, Illinois — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 14 water systems · 14 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Ogle County Earns a A

Ogle County: 14 communities across 14 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.05 ppb
  • 4 communities with a lead detection, 10 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 6 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2.05 ppb
Median Lead Level
County-wide, 90th percentile
14
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
  • Polo
    Not detected
    No federal limits exceeded on record
    B
  • Forreston
    1.20 ppb
    No federal limits exceeded on record
    B
  • Creston
    Not detected
    No federal limits exceeded on record
    B
  • Leaf River
    Not detected
    No federal limits exceeded on record
    B
  • Grand Detour
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Oregon
    2.90 ppb
    3 significant inspection deficiencies
    C
  • Mount Morris
    1.20 ppb
    5 significant inspection deficiencies
    B
  • Davis Junction
    Not detected
    3 significant inspection deficiencies
    B
  • Stillman Valley
    Not detected
    3 significant inspection deficiencies
    B
  • Monroe Center
    Not detected
    3 significant inspection deficiencies
    B
County Lead Level — Median 2.05 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.05 ppb — 13.7% of the federal action level
Systems by Lead Level
Under 5 ppb
3
5 – 10 ppb
1
No Data
10

All Cities in Ogle County

Rochelle Not detected B
Byron 6.24 ppb A
Oregon 2.90 ppb C
Mount Morris 1.20 ppb B
Polo Not detected B
Davis Junction Not detected B
Forreston 1.20 ppb B
Hillcrest Not detected B
Stillman Valley Not detected B
Creston Not detected B
Lost Nation Not detected B
Leaf River Not detected B
Monroe Center Not detected B
Grand Detour Not detected B
Showing 14 cities
No active violations Active violations

About Ogle County Drinking Water

Ogle County is served by 14 water systems covering 14 communities. No community here has an open violation on record.

Of the communities reporting lead results, 4 recorded a detection, with a median of 2.05 ppb — 14% 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 6 of them.

Frequently Asked Questions

Is Ogle County tap water safe to drink?▼
No community in Ogle County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Ogle County?▼
Among communities with a detection the median is 2.05 ppb, 14% of the 15 ppb action level. 10 reported none detected and 0 reported no result.
How many water systems serve Ogle County?▼
14 community water systems serve 14 communities here.
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