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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 305,446 residents
Will County in Illinois has an average water quality score of 86/100 (Grade A-) based on analysis of 4 municipal water systems. The county's water systems serve approximately 305,446 residents.
Overall, Will County demonstrates good water quality standards. 3 of 4 cities exceed the county average, with Romeoville leading with a score of 98/100.
4 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | Romeoville Top concern: Fluoride (16.7% of limit) | 98 | A+ | 40,559 |
| 2 | Joliet Top concern: Total Trihalomethanes (21.8% of limit) | 93 | A | 146,051 |
| 3 | Bolingbrook Top concern: Copper (16.3% of limit) | 86 | A- | 76,995 |
| 4 | Plainfield Top concern: Haloacetic Acids (54% of limit) | 67 | C+ | 41,841 |
Top detected contaminants across county water systems
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| Fluoride | 0.837 mg/L | 1.159 mg/L | 4 mg/L | 20.9% | 3 |
| Haloacetic Acids | 12.514 ug/L | 32.374 ug/L | 60 ug/L | 20.9% | 4 |
| Nitrate | 1.95 mg/L | 4.851 mg/L | 10 mg/L | 19.5% | 4 |
| Total Trihalomethanes | 15.611 ug/L | 23.447 ug/L | 80 ug/L | 19.5% | 3 |
| Copper | 0.239 mg/L | 0.521 mg/L | 1.3 mg/L | 18.4% | 4 |
| Lead | 0.002 mg/L | 0.004 mg/L | 0.015 mg/L | 13.8% | 3 |
| Mercury | 0 mg/L | 0.001 mg/L | 0.002 mg/L | 13.7% | 4 |
| Chromium | 0.012 mg/L | 0.027 mg/L | 0.1 mg/L | 11.8% | 3 |
Recent violations across county water systems
Water quality in Will 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 305,446 residents.
The county shows strong water quality performance, with scores ranging from 67/100 in Plainfield to 98/100 in Romeoville. This 31-point spread indicates significant variation in water quality across the county, suggesting different water sources or treatment approaches.
The most prevalent contaminants detected across Will County water systems include Fluoride, Haloacetic Acids, Nitrate. All monitored contaminants remain within acceptable levels relative to EPA Maximum Contaminant Levels (MCLs).
Will 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.
Will County has an average water quality score of 86/100 (Grade A-) based on analysis of 4 municipal water systems serving 305,446 residents.
Romeoville has the highest water quality score in Will County at 98/100. View the detailed report for Romeoville.
Most cities in Will 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.