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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Water quality data for 4 cities serving 196,593 residents
Lake County in Illinois has an average water quality score of 81/100 (Grade B+) based on analysis of 4 municipal water systems. The county's water systems serve approximately 196,593 residents.
Overall, Lake County demonstrates good water quality standards. 3 of 4 cities exceed the county average, with North Chicago leading with a score of 85/100.
4 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | North Chicago Top concern: Total Trihalomethanes (22.1% of limit) | 85 | A- | 31,583 |
| 2 | Buffalo Grove Top concern: Haloacetic Acids (19.7% of limit) | 83 | B+ | 44,751 |
| 3 | Waukegan Top concern: Total Trihalomethanes (37.7% of limit) | 82 | B+ | 88,294 |
| 4 | Gurnee Top concern: Nitrate (25.8% of limit) | 74 | B- | 31,965 |
Top detected contaminants across county water systems
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| Total Trihalomethanes | 18.381 ug/L | 30.131 ug/L | 80 ug/L | 23% | 3 |
| Fluoride | 0.721 mg/L | 0.793 mg/L | 4 mg/L | 18% | 3 |
| Arsenic | 0.001 mg/L | 0.002 mg/L | 0.01 mg/L | 14.8% | 4 |
| Copper | 0.19 mg/L | 0.297 mg/L | 1.3 mg/L | 14.6% | 3 |
| Haloacetic Acids | 7.849 ug/L | 14.998 ug/L | 60 ug/L | 13.1% | 4 |
| Lead | 0.002 mg/L | 0.004 mg/L | 0.015 mg/L | 12.7% | 3 |
| Mercury | 0 mg/L | 0 mg/L | 0.002 mg/L | 12.5% | 2 |
| Nitrate | 1.203 mg/L | 2.583 mg/L | 10 mg/L | 12% | 4 |
Recent violations across county water systems
Water quality in Lake County, Illinois reflects the region's unique combination of water sources, treatment infrastructure, and environmental factors. Our comprehensive analysis examines 4 municipal water systems serving a combined population of over 196,593 residents.
The county shows strong water quality performance, with scores ranging from 74/100 in Gurnee to 85/100 in North Chicago. This 11-point spread indicates relatively consistent water quality standards across municipal systems.
The most prevalent contaminants detected across Lake County water systems include Total Trihalomethanes, Fluoride, Arsenic. All monitored contaminants remain within acceptable levels relative to EPA Maximum Contaminant Levels (MCLs).
Lake County's water quality is generally good. Residents can feel confident in their tap water quality, though those with specific health concerns or sensitivity to certain contaminants may still benefit from filtration. Regular review of your city's annual Consumer Confidence Report is recommended.
Lake County has an average water quality score of 81/100 (Grade B+) based on analysis of 4 municipal water systems serving 196,593 residents.
North Chicago has the highest water quality score in Lake County at 85/100. View the detailed report for North Chicago.
Most cities in Lake County have water that meets EPA standards. However, a water filter can provide additional protection and improve taste. The need depends on your specific city and any personal health considerations.
Click on any city in the rankings table above to view its detailed water quality report, including contaminant levels, EPA compliance history, and filter recommendations.