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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 5 cities serving 167,868 residents
Lake County in Indiana has an average water quality score of 98/100 (Grade A) based on analysis of 5 municipal water systems. The county's water systems serve approximately 167,868 residents.
Overall, Lake County demonstrates good water quality standards. 3 of 5 cities exceed the county average, with Hobart leading with a score of 100/100.
5 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | Schererville | 100 | A | 30,000 |
| 2 | Highland | 100 | A | 23,984 |
| 3 | Hobart | 100 | A | 5,500 |
| 4 | Crown Point Biggest deduction: 3 monitoring/reporting violations in the last 5 years (−3 pts) | 97 | A | 30,000 |
| 5 | Hammond Biggest deduction: 5 monitoring/reporting violations in the last 5 years (−5 pts) | 95 | A | 78,384 |
Real EPA readings across county water systems (lead: latest 90th percentile; PFAS: UCMR5 2023–2026; others: 2012–2019 averages)
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| Fluoride (2012–2019 avg) | 0.926 mg/L | 0.926 mg/L | 4 mg/L | 23.2% | 1 |
| TTHM (2012–2019 avg) | 18.444 ug/L | 21.143 ug/L | 80 ug/L | 23.1% | 5 |
| HAA5 (2012–2019 avg) | 7.427 ug/L | 10.308 ug/L | 60 ug/L | 12.4% | 5 |
| Lead (90th percentile) | 1.42 ppb | 3 ppb | 15 ppb | 9.5% | 5 |
| Nitrate (2012–2019 avg) | 0.358 mg/L | 0.358 mg/L | 10 mg/L | 3.6% | 1 |
| PFAS (PFOA/PFOS max, UCMR5) | 0 ppt | 0 ppt | 4 ppt | 0% | 5 |
| Arsenic (2012–2019 avg) | 0 ug/L | 0 ug/L | 10 ug/L | 0% | 1 |
Recent violations across county water systems
Health-based: Treatment technique — WQP Entry Point/Tap Treatment Technique Non-Compliance - Lead and Copper Rule
6/30/2020
Other — Consumer Confidence Report Inadequate Reporting - Consumer Confidence Rule
6/30/2025
Monitoring & reporting — Monitoring and Reporting (DBP) - Total Haloacetic Acids (HAA5)
12/31/2024
Reporting — Report Sample Result/Fail Monitor (RTCR) - Revised Total Coliform Rule
11/10/2021
Showing 10 of 18 recent violations
Water quality in Lake County, Indiana reflects the region's unique combination of water sources, treatment infrastructure, and environmental factors. Our comprehensive analysis examines 5 municipal water systems serving a combined population of over 167,868 residents.
The county shows strong water quality performance, with scores ranging from 95/100 in Hammond to 100/100 in Hobart. This 5-point spread indicates relatively consistent water quality standards across municipal systems.
The most prevalent contaminants detected across Lake County water systems include Fluoride (2012–2019 avg), TTHM (2012–2019 avg), HAA5 (2012–2019 avg). Every county-wide average sits below 50% of its EPA Maximum Contaminant Level (MCL).
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 98/100 (Grade A) based on analysis of 5 municipal water systems serving 167,868 residents.
Hobart has the highest water quality score in Lake County at 100/100. View the detailed report for Hobart.
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.