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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 629,116 residents
Pima County in Arizona has an average water quality score of 69/100 (Grade C+) based on analysis of 3 municipal water systems. The county's water systems serve approximately 629,116 residents.
Water quality in Pima County is fair, with some cities showing room for improvement. 2 cities have scores below 70, indicating elevated contaminant levels that residents should be aware of. Sahuarita has the best water quality at 71/100.
3 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 | 38.655 ug/L | 59.859 ug/L | 80 ug/L | 48.3% | 3 |
| Haloacetic Acids | 24.658 ug/L | 25.54 ug/L | 60 ug/L | 41.1% | 2 |
| Lead | 0.005 mg/L | 0.006 mg/L | 0.015 mg/L | 33.1% | 3 |
| Nitrite | 0.325 mg/L | 0.37 mg/L | 1 mg/L | 32.5% | 3 |
| Copper | 0.422 mg/L | 0.694 mg/L | 1.3 mg/L | 32.5% | 3 |
| Arsenic | 0.003 mg/L | 0.005 mg/L | 0.01 mg/L | 30.7% | 3 |
| Fluoride | 0.935 mg/L | 1.061 mg/L | 4 mg/L | 23.4% | 3 |
| Nitrate | 2.058 mg/L | 3.375 mg/L | 10 mg/L | 20.6% | 2 |
Recent violations across county water systems
Showing 10 of 14 recent violations
Water quality in Pima County, Arizona 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 629,116 residents.
The county shows moderate water quality performance, with scores ranging from 68/100 in Tucson to 71/100 in Sahuarita. This 3-point spread indicates relatively consistent water quality standards across municipal systems.
The most prevalent contaminants detected across Pima County water systems include Total Trihalomethanes, Haloacetic Acids, Lead. All monitored contaminants remain within acceptable levels relative to EPA Maximum Contaminant Levels (MCLs).
Water quality in Pima 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.
Pima County has an average water quality score of 69/100 (Grade C+) based on analysis of 3 municipal water systems serving 629,116 residents.
Sahuarita has the highest water quality score in Pima County at 71/100. View the detailed report for Sahuarita.
Given the water quality variation across Pima County, we recommend reviewing your specific city's water quality report. 2 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.