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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 6 cities serving 216,432 residents
Pinal County in Arizona has an average water quality score of 87/100 (Grade A-) based on analysis of 6 municipal water systems. The county's water systems serve approximately 216,432 residents.
Overall, Pinal County demonstrates good water quality standards. 3 of 6 cities exceed the county average, with Apache Junction leading with a score of 94/100.
6 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | Apache Junction Top concern: Fluoride (18.6% of limit) | 94 | A | 41,968 |
| 2 | Casa Grande Top concern: Nitrate (14.2% of limit) | 90 | A | 53,655 |
| 3 | Maricopa Top concern: Total Trihalomethanes (22.3% of limit) | 88 | A- | 66,979 |
| 4 | Eloy Top concern: Fluoride (15% of limit) | 86 | A- | 19,048 |
| 5 | Florence Top concern: Fluoride (18.3% of limit) | 84 | B+ | 21,877 |
| 6 | Coolidge Top concern: Haloacetic Acids (44.4% of limit) | 81 | B+ | 12,905 |
Top detected contaminants across county water systems
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| Haloacetic Acids | 12.942 ug/L | 26.667 ug/L | 60 ug/L | 21.6% | 3 |
| Fluoride | 0.669 mg/L | 0.795 mg/L | 4 mg/L | 16.7% | 6 |
| Lead | 0.002 mg/L | 0.005 mg/L | 0.015 mg/L | 16.1% | 6 |
| Mercury | 0 mg/L | 0 mg/L | 0.002 mg/L | 10.8% | 6 |
| Copper | 0.133 mg/L | 0.414 mg/L | 1.3 mg/L | 10.2% | 5 |
| Total Trihalomethanes | 6.711 ug/L | 17.878 ug/L | 80 ug/L | 8.4% | 6 |
| Nitrite | 0.074 mg/L | 0.121 mg/L | 1 mg/L | 7.4% | 6 |
| Nitrate | 0.653 mg/L | 1.42 mg/L | 10 mg/L | 6.5% | 5 |
Recent violations across county water systems
Water quality in Pinal County, Arizona reflects the region's unique combination of water sources, treatment infrastructure, and environmental factors. Our comprehensive analysis examines 6 municipal water systems serving a combined population of over 216,432 residents.
The county shows strong water quality performance, with scores ranging from 81/100 in Coolidge to 94/100 in Apache Junction. This 13-point spread indicates relatively consistent water quality standards across municipal systems.
The most prevalent contaminants detected across Pinal County water systems include Haloacetic Acids, Fluoride, Lead. All monitored contaminants remain within acceptable levels relative to EPA Maximum Contaminant Levels (MCLs).
Pinal 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.
Pinal County has an average water quality score of 87/100 (Grade A-) based on analysis of 6 municipal water systems serving 216,432 residents.
Apache Junction has the highest water quality score in Pinal County at 94/100. View the detailed report for Apache Junction.
Most cities in Pinal 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.