Arizona — 4th District
119th Congress · 31 ZIP codes · Avg score 72/100 · Grade B · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 31 ZIP codes in Arizona's 4th District: the district earns a grade B (72/100). 881 EPA violations on record, 92 health-based.
Top Contaminants
ZIP Codes in This District
31 ZIP codes tracked in Arizona's 4th District.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 85280 | Tempe | 82 | B | 24 (1 health) |
| 2 | 85282 | Tempe | 82 | B | 24 (1 health) |
| 3 | 85283 | Tempe | 82 | B | 24 (1 health) |
| 4 | 85284 | Tempe | 82 | B | 24 (1 health) |
| 5 | 85285 | Tempe | 82 | B | 24 (1 health) |
| 6 | 85287 | Tempe | 82 | B | 24 (1 health) |
| 7 | 85289 | Tempe | 82 | B | 24 (1 health) |
| 8 | 85224 | Chandler | 78 | B | 20 (2 health) |
| 9 | 85226 | Chandler | 78 | B | 20 (2 health) |
| 10 | 85246 | Chandler | 78 | B | 20 (2 health) |
| 11 | 85244 | Chandler | 77 | B | 20 (2 health) |
| 12 | 85281 | Tempe | 77 | B | 24 (1 health) |
| 13 | 85202 | Mesa | 72 | B | 7 |
| 14 | 85204 | Mesa | 72 | B | 7 |
| 15 | 85205 | Mesa | 72 | B | 7 |
| 16 | 85207 | Mesa | 72 | B | 7 |
| 17 | 85210 | Mesa | 72 | B | 7 |
| 18 | 85213 | Mesa | 72 | B | 7 |
| 19 | 85214 | Mesa | 72 | B | 7 |
| 20 | 85215 | Mesa | 72 | B | 7 |
| 21 | 85216 | Mesa | 72 | B | 7 |
| 22 | 85274 | Mesa | 72 | B | 7 |
| 23 | 85275 | Mesa | 72 | B | 7 |
| 24 | 85277 | Mesa | 72 | B | 7 |
| 25 | 85201 | Mesa | 67 | C | 7 |
| 26 | 85203 | Mesa | 67 | C | 7 |
| 27 | 85206 | Mesa | 67 | C | 7 |
| 28 | 85044 | Phoenix | 58 | C | 126 (19 health) |
| 29 | 85048 | Phoenix | 58 | C | 126 (19 health) |
| 30 | 85045 | Phoenix | 50 | D | 126 (19 health) |
| 31 | 85055 | Phoenix | 50 | D | 126 (19 health) |
Overview
Arizona's 4th District encompasses 31 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (72/100).
881 EPA violations have been recorded across this district's water systems. 92 are health-based violations. About 100% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Consumer Confidence Report Rule - 227 violations
- Stage 2 DBP Rule - 84 violations
- Revised Total Coliform Rule - 76 violations
- Lead and Copper Rule - 60 violations
- Lead - 60 violations
Housing Context
Homes in this district were built on average around 1985 (~41 years old). Older homes may have lead pipes or solder - consider a water filter if your home predates 1986.
Data Sources
- Water quality violations: EPA Safe Drinking Water Information System (SDWIS)
- Congressional district boundaries: U.S. Census Bureau, 119th Congress
- Housing age: U.S. Census Bureau American Community Survey
Updated daily. Data covers 31 ZIP codes in Arizona's 4th District.