Loading water data...
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 2 cities serving 937,891 residents
Marion County in Indiana has an average water quality score of 82/100 (Grade B+) based on analysis of 2 municipal water systems. The county's water systems serve approximately 937,891 residents.
Overall, Marion County demonstrates good water quality standards. 1 of 2 cities exceed the county average, with Indianapolis leading with a score of 84/100.
2 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | Indianapolis Top concern: Copper (31.3% of limit) | 84 | B+ | 891,437 |
| 2 | Lawrence Top concern: Total Trihalomethanes (33.4% of limit) | 80 | B+ | 46,454 |
Top detected contaminants across county water systems
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| Total Trihalomethanes | 23.01 ug/L | 26.684 ug/L | 80 ug/L | 28.8% | 2 |
| Fluoride | 1.067 mg/L | 1.067 mg/L | 4 mg/L | 26.7% | 1 |
| Chromium | 0.024 mg/L | 0.029 mg/L | 0.1 mg/L | 24.1% | 2 |
| Nitrate | 1.611 mg/L | 2.095 mg/L | 10 mg/L | 16.1% | 2 |
| Copper | 0.207 mg/L | 0.407 mg/L | 1.3 mg/L | 15.9% | 2 |
| Mercury | 0 mg/L | 0 mg/L | 0.002 mg/L | 15% | 2 |
| Nitrite | 0.106 mg/L | 0.199 mg/L | 1 mg/L | 10.6% | 2 |
| Haloacetic Acids | 6.042 ug/L | 6.042 ug/L | 60 ug/L | 10.1% | 1 |
Recent violations across county water systems
Water quality in Marion County, Indiana reflects the region's unique combination of water sources, treatment infrastructure, and environmental factors. Our comprehensive analysis examines 2 municipal water systems serving a combined population of over 937,891 residents.
The county shows strong water quality performance, with scores ranging from 80/100 in Lawrence to 84/100 in Indianapolis. This 4-point spread indicates relatively consistent water quality standards across municipal systems.
The most prevalent contaminants detected across Marion County water systems include Total Trihalomethanes, Fluoride, Chromium. All monitored contaminants remain within acceptable levels relative to EPA Maximum Contaminant Levels (MCLs).
Marion 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.
Marion County has an average water quality score of 82/100 (Grade B+) based on analysis of 2 municipal water systems serving 937,891 residents.
Indianapolis has the highest water quality score in Marion County at 84/100. View the detailed report for Indianapolis.
Most cities in Marion 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.