Arizona County Water Quality Reports
Water quality reports for all counties in Arizona. Browse by county to see safety scores, violations, and ZIP code data.
Browse water quality data by county in Arizona. Each county page lists all ZIP codes with safety scores and EPA violation data.
Apache County, AZ: 5 Health Violations — 58/100 (2026)
2026 report: Apache County, AZ scores 58/100 (Grade C). 33 ZIP codes analyzed. 141 EPA violations found. Free report with contaminant data and filter pi...
Cochise County, AZ: 104 Health Violations — 72/100 (2026)
2026 report: Cochise County, AZ scores 72/100 (Grade B). 29 ZIP codes analyzed. 487 EPA violations found. Free report with contaminant data and filter p...
Coconino County, AZ: 22 Health Violations — 63/100 (2026)
2026 report: Coconino County, AZ scores 63/100 (Grade C). 36 ZIP codes analyzed. 374 EPA violations found. Free report with contaminant data and filter ...
Gila County, AZ: Lead Above EPA Limits — 63/100 (2026)
2026 report: Gila County, AZ scores 63/100 (Grade C). 15 ZIP codes analyzed. 152 EPA violations found. Lead above EPA limits. Free report with contamina...
Graham County, AZ: Lead Above EPA Limits — 58/100 (2026)
2026 report: Graham County, AZ scores 58/100 (Grade C). 8 ZIP codes analyzed. 227 EPA violations found. Lead above EPA limits. Free report with contamin...
Greenlee County, AZ: 17 Health Violations — 63/100 (2026)
2026 report: Greenlee County, AZ scores 63/100 (Grade C). 3 ZIP codes analyzed. 115 EPA violations found. Free report with contaminant data and filter p...
La Paz County, AZ: 23 Health Violations — 66/100 (2026)
2026 report: La Paz County, AZ scores 66/100 (Grade C). 9 ZIP codes analyzed. 163 EPA violations found. Free report with contaminant data and filter picks.
Maricopa County, AZ: 1668 Health Violations — 64/100 (2026)
2026 report: Maricopa County, AZ scores 64/100 (Grade C). 197 ZIP codes analyzed. 12382 EPA violations found. Free report with contaminant data and filt...
Mohave County, AZ: 23 Health Violations — 72/100 (2026)
2026 report: Mohave County, AZ scores 72/100 (Grade B). 28 ZIP codes analyzed. 525 EPA violations found. Free report with contaminant data and filter pi...
Navajo County, AZ: 24 Health Violations — 68/100 (2026)
2026 report: Navajo County, AZ scores 68/100 (Grade C). 21 ZIP codes analyzed. 330 EPA violations found. Free report with contaminant data and filter pi...
Pima County, AZ: 1577 Health Violations — 58/100 (2026)
2026 report: Pima County, AZ scores 58/100 (Grade C). 72 ZIP codes analyzed. 11963 EPA violations found. Free report with contaminant data and filter pi...
Pinal County, AZ: Lead Above EPA Limits — 71/100 (2026)
2026 report: Pinal County, AZ scores 71/100 (Grade B). 48 ZIP codes analyzed. 1442 EPA violations found. Lead above EPA limits. Free report with contami...
Santa Cruz County, AZ: 13 Health Violations — 68/100 (2026)
2026 report: Santa Cruz County, AZ scores 68/100 (Grade C). 8 ZIP codes analyzed. 156 EPA violations found. Free report with contaminant data and filter...
Yavapai County, AZ: 164 Health Violations — 63/100 (2026)
2026 report: Yavapai County, AZ scores 63/100 (Grade C). 34 ZIP codes analyzed. 610 EPA violations found. Free report with contaminant data and filter p...
Yuma County, AZ: 152 Health Violations — 63/100 (2026)
2026 report: Yuma County, AZ scores 63/100 (Grade C). 12 ZIP codes analyzed. 619 EPA violations found. Free report with contaminant data and filter picks.
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