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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 4 cities serving 170,807 residents
Pinal County in Arizona has an average water quality score of 86/100 (Grade B) based on analysis of 4 municipal water systems. The county's water systems serve approximately 170,807 residents.
Overall, Pinal County demonstrates good water quality standards. 2 of 4 cities exceed the county average, with Apache Junction leading with a score of 100/100.
4 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | Apache Junction | 100 | A | 62,055 |
| 2 | Eloy Biggest deduction: 10 monitoring/reporting violations in the last 5 years (−10 pts) | 87 | B | 8,852 |
| 3 | Florence Biggest deduction: 1 health-based violation (MCL/treatment-technique) in the last 5 years (−10 pts) | 80 | B | 15,900 |
| 4 | Maricopa Biggest deduction: 1 health-based violation (MCL/treatment-technique) in the last 5 years (−10 pts) | 77 | C | 84,000 |
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 |
|---|---|---|---|---|---|
| Arsenic (2012–2019 avg) | 5.08 ug/L | 7.31 ug/L | 10 ug/L | 50.8% | 4 |
| Nitrate (2012–2019 avg) | 4.626 mg/L | 6.596 mg/L | 10 mg/L | 46.3% | 4 |
| PFAS (PFOA/PFOS max, UCMR5) | 1.75 ppt | 7 ppt | 4 ppt | 43.8% | 4 |
| Uranium (2012–2019 avg) | 12.773 ug/L | 12.773 ug/L | 30 ug/L | 42.6% | 1 |
| TTHM (2012–2019 avg) | 17.041 ug/L | 25.813 ug/L | 80 ug/L | 21.3% | 4 |
| Fluoride (2012–2019 avg) | 0.791 mg/L | 1.427 mg/L | 4 mg/L | 19.8% | 4 |
| HAA5 (2012–2019 avg) | 3.305 ug/L | 5.713 ug/L | 60 ug/L | 5.5% | 4 |
| Radium (2012–2019 avg) | 0.044 pCi/L | 0.176 pCi/L | 5 pCi/L | 0.9% | 4 |
Recent violations across county water systems
Health-based: MCL exceeded — Maximum Contaminant Level Violation, E. coli (RTCR) - Revised Total Coliform Rule
7/31/2025
Health-based: MCL exceeded — Maximum Contaminant Level Violation, Single Sample - Nitrate
12/31/2024
Showing 10 of 20 recent violations
Water quality in Pinal County, Arizona reflects the region's unique combination of water sources, treatment infrastructure, and environmental factors. Our comprehensive analysis examines 4 municipal water systems serving a combined population of over 170,807 residents.
The county shows strong water quality performance, with scores ranging from 77/100 in Maricopa to 100/100 in Apache Junction. This 23-point spread indicates significant variation in water quality across the county, suggesting different water sources or treatment approaches.
The most prevalent contaminants detected across Pinal County water systems include Arsenic (2012–2019 avg), Nitrate (2012–2019 avg), PFAS (PFOA/PFOS max, UCMR5). At least one reading averages above 50% of its EPA limit across the county's systems, worth attention from residents and utilities.
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 86/100 (Grade B) based on analysis of 4 municipal water systems serving 170,807 residents.
Apache Junction has the highest water quality score in Pinal County at 100/100. 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.