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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 2 cities serving 100,608 residents
Cobb County in Georgia has an average water quality score of 96/100 (Grade A) based on analysis of 2 municipal water systems. The county's water systems serve approximately 100,608 residents.
Overall, Cobb County demonstrates good water quality standards. 2 of 2 cities exceed the county average, with Smyrna leading with a score of 96/100.
2 cities ranked by water quality score
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 |
|---|---|---|---|---|---|
| PFAS (PFOA/PFOS max, UCMR5) | 0 ppt | 0 ppt | 4 ppt | 0% | 2 |
Recent violations across county water systems
Other — Consumer Confidence Report Complete Failure to Report - Consumer Confidence Rule
6/30/2016
Water quality in Cobb County, Georgia 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 100,608 residents.
The county shows strong water quality performance, with scores ranging from 96/100 in Marietta to 96/100 in Smyrna. This 0-point spread indicates relatively consistent water quality standards across municipal systems.
The most prevalent contaminants detected across Cobb County water systems include PFAS (PFOA/PFOS max, UCMR5). Every county-wide average sits below 50% of its EPA Maximum Contaminant Level (MCL).
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 96/100 (Grade A) based on analysis of 2 municipal water systems serving 100,608 residents.
Smyrna has the highest water quality score in Cobb County at 96/100. View the detailed report for Smyrna.
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.