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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 218,073 residents
Cobb County in Georgia has an average water quality score of 80/100 (Grade B+) based on analysis of 5 municipal water systems. The county's water systems serve approximately 218,073 residents.
Overall, Cobb County demonstrates good water quality standards. 3 of 5 cities exceed the county average, with Mableton leading with a score of 86/100.
5 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | Mableton Top concern: Total Trihalomethanes (13.8% of limit) | 86 | A- | 44,163 |
| 2 | Acworth Top concern: Fluoride (14.7% of limit) | 83 | B+ | 19,135 |
| 3 | Marietta Top concern: Mercury (29.4% of limit) | 81 | B+ | 62,878 |
| 4 | Smyrna Top concern: Lead (29.9% of limit) | 76 | B | 61,425 |
| 5 | Kennesaw Top concern: Mercury (26.7% of limit) | 75 | B | 30,472 |
Top detected contaminants across county water systems
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| Lead | 0.003 mg/L | 0.005 mg/L | 0.015 mg/L | 17.8% | 4 |
| Fluoride | 0.66 mg/L | 0.824 mg/L | 4 mg/L | 16.5% | 5 |
| Mercury | 0 mg/L | 0.001 mg/L | 0.002 mg/L | 16% | 5 |
| Total Trihalomethanes | 10.449 ug/L | 17.948 ug/L | 80 ug/L | 13.1% | 4 |
| Copper | 0.138 mg/L | 0.27 mg/L | 1.3 mg/L | 10.6% | 5 |
| Nitrate | 0.997 mg/L | 1.63 mg/L | 10 mg/L | 10% | 4 |
| Chromium | 0.01 mg/L | 0.015 mg/L | 0.1 mg/L | 9.5% | 3 |
| Nitrite | 0.094 mg/L | 0.256 mg/L | 1 mg/L | 9.4% | 5 |
Recent violations across county water systems
Water quality in Cobb County, Georgia 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 218,073 residents.
The county shows strong water quality performance, with scores ranging from 75/100 in Kennesaw to 86/100 in Mableton. This 11-point spread indicates relatively consistent water quality standards across municipal systems.
The most prevalent contaminants detected across Cobb County water systems include Lead, Fluoride, Mercury. All monitored contaminants remain within acceptable levels relative to EPA Maximum Contaminant Levels (MCLs).
Cobb 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.
Cobb County has an average water quality score of 80/100 (Grade B+) based on analysis of 5 municipal water systems serving 218,073 residents.
Mableton has the highest water quality score in Cobb County at 86/100. View the detailed report for Mableton.
Most cities in Cobb 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.