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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 8 cities serving 481,840 residents
New Haven County in Connecticut has an average water quality score of 83/100 (Grade B+) based on analysis of 8 municipal water systems. The county's water systems serve approximately 481,840 residents.
Overall, New Haven County demonstrates good water quality standards. 4 of 8 cities exceed the county average, with West Haven leading with a score of 97/100.
8 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | West Haven Top concern: Nitrate (14.9% of limit) | 97 | A+ | 56,618 |
| 2 | Naugatuck Top concern: Lead (12.5% of limit) | 92 | A | 29,399 |
| 3 | Meriden Top concern: Haloacetic Acids (18.6% of limit) | 87 | A- | 61,969 |
| 4 | Waterbury Top concern: Nitrate (14.2% of limit) | 85 | A- | 114,118 |
| 5 | Derby Top concern: Copper (26.8% of limit) | 82 | B+ | 7,932 |
| 6 | Ansonia Top concern: Lead (28.1% of limit) | 81 | B+ | 19,979 |
| 7 | Milford Top concern: Lead (31.6% of limit) | 71 | B- | 57,487 |
| 8 | New Haven Top concern: Mercury (49.8% of limit) | 68 | C+ | 134,338 |
Top detected contaminants across county water systems
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| Fluoride | 0.856 mg/L | 1.382 mg/L | 4 mg/L | 21.4% | 5 |
| Nitrate | 1.822 mg/L | 3.922 mg/L | 10 mg/L | 18.2% | 7 |
| Lead | 0.003 mg/L | 0.005 mg/L | 0.015 mg/L | 17.7% | 8 |
| Chromium | 0.018 mg/L | 0.046 mg/L | 0.1 mg/L | 17.7% | 7 |
| Haloacetic Acids | 9.452 ug/L | 26.412 ug/L | 60 ug/L | 15.8% | 8 |
| Total Trihalomethanes | 10.696 ug/L | 23.587 ug/L | 80 ug/L | 13.4% | 7 |
| Arsenic | 0.001 mg/L | 0.004 mg/L | 0.01 mg/L | 12.6% | 7 |
| Nitrite | 0.124 mg/L | 0.269 mg/L | 1 mg/L | 12.4% | 8 |
Recent violations across county water systems
Showing 10 of 15 recent violations
Water quality in New Haven County, Connecticut reflects the region's unique combination of water sources, treatment infrastructure, and environmental factors. Our comprehensive analysis examines 8 municipal water systems serving a combined population of over 481,840 residents.
The county shows strong water quality performance, with scores ranging from 68/100 in New Haven to 97/100 in West Haven. This 29-point spread indicates significant variation in water quality across the county, suggesting different water sources or treatment approaches.
The most prevalent contaminants detected across New Haven County water systems include Fluoride, Nitrate, Lead. All monitored contaminants remain within acceptable levels relative to EPA Maximum Contaminant Levels (MCLs).
New Haven 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.
New Haven County has an average water quality score of 83/100 (Grade B+) based on analysis of 8 municipal water systems serving 481,840 residents.
West Haven has the highest water quality score in New Haven County at 97/100. View the detailed report for West Haven.
Most cities in New Haven 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.