Arizona Water Quality Brief
State: Arizona (AZ) Grade: D | Score: 64/100 | National Average: 67/100 (Grade: D) Data as of: 2026-04-30 | Brief generated: 2026-04-30
Key Findings
- Arizona earned a water quality grade of D with an average score of 64/100 — 3 points below the national average.
- ZipCheckup recorded 29,686 total violations across 553 ZIP codes, including 4,074 health-based violations.
- The worst ZIP code in the state (86302) scored only 27/100, while the best (85342) scored 83/100 — a gap of 56 points.
Worst 5 ZIP Codes
| ZIP | City | County | Score | Grade | Violations |
|---|---|---|---|---|---|
| 86313 | Prescott | Yavapai | 27/100 | F | 49 |
| 86304 | Prescott | Yavapai | 27/100 | F | 49 |
| 86302 | Prescott | Yavapai | 27/100 | F | 49 |
| 86305 | Prescott | Yavapai | 36/100 | F | 49 |
| 86303 | Prescott | Yavapai | 36/100 | F | 49 |
County Breakdown (Worst 3)
| County | Avg Score | Grade | ZIP Count | Worst ZIP |
|---|---|---|---|---|
| Pima | 58/100 | C | 72 | 85749 (Tucson, 48/100) |
| Apache | 58/100 | C | 33 | 85938 (Springerville, 45/100) |
| Graham | 58/100 | C | 8 | 85551 (Solomon, 53/100) |
Violation Summary
| Category | Count |
|---|---|
| Total violations | 29,686 |
| Health-based violations | 4,074 |
| Monitoring/Reporting violations | 25,612 |
| ZIP codes analyzed | 553 |
| Health violations per ZIP (avg) | 7.4 |
Top health-based violation categories:
- Consumer Confidence Report Rule (6,928 violations across 408 ZIP codes)
- Stage 1 DBP Rule (1,751 violations across 344 ZIP codes)
- Barium (1,233 violations across 268 ZIP codes)
PFAS Contamination Status
- PFAS detected in 207 of 568 ZIP codes analyzed (36%).
- 113 ZIP codes with federal PFAS exceedances.
- 40 ZIP codes exceeding state-level PFAS limits.
- State has enacted its own PFAS MCLs (stricter than federal standards).
Comparison to National Average
| Metric | AZ | National |
|---|---|---|
| Avg Score | 64/100 | 67/100 |
| Grade | D | D |
| Health violations / ZIP | 7.4 | — |
About This Data
Data: ZipCheckup.com | Sources: EPA SDWIS, FEMA, CDC, Census | License: CC BY 4.0
Press contact: [email protected] General contact: [email protected] State page: https://zipcheckup.com/states/arizona/
ZipCheckup.com analyzes drinking water quality, flood risk, lead exposure, and other home safety factors for every US ZIP code using data from 50+ federal sources.