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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 7 cities serving 307,665 residents
Lake County in Indiana has an average water quality score of 80/100 (Grade B+) based on analysis of 7 municipal water systems. The county's water systems serve approximately 307,665 residents.
Overall, Lake County demonstrates good water quality standards. 4 of 7 cities exceed the county average, with Crown Point leading with a score of 94/100.
7 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | Crown Point Top concern: Haloacetic Acids (20% of limit) | 94 | A | 34,275 |
| 2 | Merrillville Top concern: Fluoride (17.7% of limit) | 93 | A | 36,745 |
| 3 | Gary Top concern: Lead (27.3% of limit) | 84 | B+ | 73,133 |
| 4 | Highland Top concern: Copper (29% of limit) | 83 | B+ | 22,104 |
| 5 | Schererville Top concern: Lead (36.4% of limit) | 74 | B- | 33,713 |
| 6 | Hobart Top concern: Copper (31.2% of limit) | 72 | B- | 31,432 |
| 7 | Hammond Top concern: Total Trihalomethanes (67.9% of limit) | 57 | C- | 76,263 |
Top detected contaminants across county water systems
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| Lead | 0.004 mg/L | 0.006 mg/L | 0.015 mg/L | 24% | 7 |
| Total Trihalomethanes | 18.98 ug/L | 54.311 ug/L | 80 ug/L | 23.7% | 6 |
| Copper | 0.28 mg/L | 0.457 mg/L | 1.3 mg/L | 21.5% | 6 |
| Fluoride | 0.743 mg/L | 1.093 mg/L | 4 mg/L | 18.6% | 7 |
| Chromium | 0.015 mg/L | 0.034 mg/L | 0.1 mg/L | 14.8% | 6 |
| Haloacetic Acids | 8.789 ug/L | 20.824 ug/L | 60 ug/L | 14.6% | 6 |
| Nitrate | 1.355 mg/L | 2.316 mg/L | 10 mg/L | 13.5% | 7 |
| Mercury | 0 mg/L | 0.001 mg/L | 0.002 mg/L | 11.4% | 7 |
Recent violations across county water systems
Water quality in Lake County, Indiana reflects the region's unique combination of water sources, treatment infrastructure, and environmental factors. Our comprehensive analysis examines 7 municipal water systems serving a combined population of over 307,665 residents.
The county shows strong water quality performance, with scores ranging from 57/100 in Hammond to 94/100 in Crown Point. This 37-point spread indicates significant variation in water quality across the county, suggesting different water sources or treatment approaches.
The most prevalent contaminants detected across Lake County water systems include Lead, Total Trihalomethanes, Copper. 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 80/100 (Grade B+) based on analysis of 7 municipal water systems serving 307,665 residents.
Crown Point has the highest water quality score in Lake County at 94/100. View the detailed report for Crown Point.
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.