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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 3 cities serving 778,620 residents
Suffolk County in Massachusetts has an average water quality score of 91/100 (Grade A) based on analysis of 3 municipal water systems. The county's water systems serve approximately 778,620 residents.
Overall, Suffolk County demonstrates good water quality standards. 2 of 3 cities exceed the county average, with Chelsea leading with a score of 100/100.
3 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 |
|---|---|---|---|---|---|
| Lead (90th percentile) | 5.42 ppb | 8.05 ppb | 15 ppb | 36.1% | 3 |
| PFAS (PFOA/PFOS max, UCMR5) | 0 ppt | 0 ppt | 4 ppt | 0% | 3 |
Recent violations across county water systems
Health-based: Treatment technique — Lead Service Line Replacement (LSLR) - Lead and Copper Rule
10/31/2020
Water quality in Suffolk County, Massachusetts reflects the region's unique combination of water sources, treatment infrastructure, and environmental factors. Our comprehensive analysis examines 3 municipal water systems serving a combined population of over 778,620 residents.
The county shows strong water quality performance, with scores ranging from 77/100 in Boston to 100/100 in Chelsea. This 23-point spread indicates significant variation in water quality across the county, suggesting different water sources or treatment approaches.
The most prevalent contaminants detected across Suffolk County water systems include Lead (90th percentile), PFAS (PFOA/PFOS max, UCMR5). Every county-wide average sits below 50% of its EPA Maximum Contaminant Level (MCL).
Suffolk 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.
Suffolk County has an average water quality score of 91/100 (Grade A) based on analysis of 3 municipal water systems serving 778,620 residents.
Chelsea has the highest water quality score in Suffolk County at 100/100. View the detailed report for Chelsea.
Most cities in Suffolk 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.