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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 653,854 residents
Fresno County in California has an average water quality score of 78/100 (Grade B) based on analysis of 2 municipal water systems. The county's water systems serve approximately 653,854 residents.
Water quality in Fresno County is fair, with some cities showing room for improvement. Clovis has the best water quality at 82/100.
2 cities ranked by water quality score
Top detected contaminants across county water systems
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| Total Trihalomethanes | 26.342 ug/L | 34.272 ug/L | 80 ug/L | 32.9% | 2 |
| Lead | 0.003 mg/L | 0.004 mg/L | 0.015 mg/L | 20.7% | 2 |
| Haloacetic Acids | 9.314 ug/L | 13.099 ug/L | 60 ug/L | 15.5% | 2 |
| Nitrite | 0.15 mg/L | 0.244 mg/L | 1 mg/L | 15% | 2 |
| Chromium | 0.014 mg/L | 0.016 mg/L | 0.1 mg/L | 14.3% | 2 |
| Nitrate | 1.335 mg/L | 2.385 mg/L | 10 mg/L | 13.4% | 2 |
| Arsenic | 0.001 mg/L | 0.003 mg/L | 0.01 mg/L | 13% | 2 |
| Fluoride | 0.516 mg/L | 0.516 mg/L | 4 mg/L | 12.9% | 1 |
Recent violations across county water systems
Water quality in Fresno County, California 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 653,854 residents.
The county shows moderate water quality performance, with scores ranging from 74/100 in Fresno to 82/100 in Clovis. This 8-point spread indicates relatively consistent water quality standards across municipal systems.
The most prevalent contaminants detected across Fresno County water systems include Total Trihalomethanes, Lead, Haloacetic Acids. All monitored contaminants remain within acceptable levels relative to EPA Maximum Contaminant Levels (MCLs).
Water quality in Fresno County is fair but shows room for improvement. Residents in cities scoring below 70 should consider water filtration, particularly for drinking and cooking. Check your specific city's report above for personalized recommendations.
Fresno County has an average water quality score of 78/100 (Grade B) based on analysis of 2 municipal water systems serving 653,854 residents.
Clovis has the highest water quality score in Fresno County at 82/100. View the detailed report for Clovis.
Given the water quality variation across Fresno County, we recommend reviewing your specific city's water quality report. 0 cities have scores below 70, where filtration is particularly recommended.
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.