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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 675,846 residents
Fresno County in California has an average water quality score of 71/100 (Grade C) based on analysis of 2 municipal water systems. The county's water systems serve approximately 675,846 residents.
Water quality in Fresno County is fair, with some cities showing room for improvement. Clovis has the best water quality at 71/100.
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) | 35.5 ppt | 41 ppt | 4 ppt | 887.5% | 2 |
| Nitrate (2012–2019 avg) | 5.343 mg/L | 6.086 mg/L | 10 mg/L | 53.4% | 2 |
| TTHM (2012–2019 avg) | 14.351 ug/L | 27.002 ug/L | 80 ug/L | 17.9% | 2 |
| HAA5 (2012–2019 avg) | 7.703 ug/L | 13.812 ug/L | 60 ug/L | 12.8% | 2 |
| Lead (90th percentile) | 0 ppb | 0 ppb | 15 ppb | 0% | 2 |
| Arsenic (2012–2019 avg) | 0 ug/L | 0 ug/L | 10 ug/L | 0% | 2 |
| Fluoride (2012–2019 avg) | 0 mg/L | 0 mg/L | 4 mg/L | 0% | 2 |
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 675,846 residents.
The county shows moderate water quality performance, with scores ranging from 71/100 in Fresno to 71/100 in Clovis. This 0-point spread indicates relatively consistent water quality standards across municipal systems.
The most prevalent contaminants detected across Fresno County water systems include PFAS (PFOA/PFOS max, UCMR5), Nitrate (2012–2019 avg), TTHM (2012–2019 avg). At least one reading averages above 50% of its EPA limit across the county's systems, worth attention from residents and utilities.
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 71/100 (Grade C) based on analysis of 2 municipal water systems serving 675,846 residents.
Clovis has the highest water quality score in Fresno County at 71/100. 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.