California — 28th District
119th Congress · 72 ZIP codes · Avg score 77/100 · Grade B · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 72 ZIP codes in California's 28th District: the district earns a grade B (77/100). 164 EPA violations on record, 8 health-based.
Top Contaminants
ZIP Codes in This District
72 ZIP codes tracked in California's 28th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 91109 | Pasadena | 93 | A | 5 |
| 2 | 91031 | South Pasadena | 83 | B | 0 |
| 3 | 91224 | La Crescenta | 83 | B | 0 |
| 4 | 91711 | Claremont | 83 | B | 0 |
| 5 | 91741 | Glendora | 83 | B | 1 |
| 6 | 91801 | Alhambra | 83 | B | 0 |
| 7 | 91802 | Alhambra | 83 | B | 0 |
| 8 | 91803 | Alhambra | 83 | B | 0 |
| 9 | 91804 | Alhambra | 83 | B | 0 |
| 10 | 91841 | Alhambra | 83 | B | 0 |
| 11 | 91896 | Alhambra | 83 | B | 0 |
| 12 | 91899 | Alhambra | 83 | B | 0 |
| 13 | 91737 | Rancho Cucamonga | 82 | B | 3 |
| 14 | 91739 | Rancho Cucamonga | 82 | B | 3 |
| 15 | 91012 | La Canada Flintridge | 81 | B | 1 |
| 16 | 91101 | Pasadena | 81 | B | 5 |
| 17 | 91102 | Pasadena | 81 | B | 5 |
| 18 | 91104 | Pasadena | 81 | B | 5 |
| 19 | 91106 | Pasadena | 81 | B | 5 |
| 20 | 91110 | Pasadena | 81 | B | 5 |
| 21 | 91114 | Pasadena | 81 | B | 5 |
| 22 | 91115 | Pasadena | 81 | B | 5 |
| 23 | 91116 | Pasadena | 81 | B | 5 |
| 24 | 91117 | Pasadena | 81 | B | 5 |
| 25 | 91121 | Pasadena | 81 | B | 5 |
| 26 | 91123 | Pasadena | 81 | B | 5 |
| 27 | 91124 | Pasadena | 81 | B | 5 |
| 28 | 91125 | Pasadena | 81 | B | 5 |
| 29 | 91126 | Pasadena | 81 | B | 5 |
| 30 | 91129 | Pasadena | 81 | B | 5 |
| 31 | 91182 | Pasadena | 81 | B | 5 |
| 32 | 91184 | Pasadena | 81 | B | 5 |
| 33 | 91185 | Pasadena | 81 | B | 5 |
| 34 | 91188 | Pasadena | 81 | B | 5 |
| 35 | 91189 | Pasadena | 81 | B | 5 |
| 36 | 91191 | Pasadena | 81 | B | 5 |
| 37 | 91199 | Pasadena | 81 | B | 5 |
| 38 | 91770 | Rosemead | 81 | B | 2 |
| 39 | 91771 | Rosemead | 81 | B | 2 |
| 40 | 91772 | Rosemead | 81 | B | 2 |
| 41 | 91007 | Arcadia | 79 | B | 2 (1 health) |
| 42 | 91755 | Monterey Park | 79 | B | 2 (1 health) |
| 43 | 91756 | Monterey Park | 79 | B | 2 (1 health) |
| 44 | 91030 | South Pasadena | 78 | B | 0 |
| 45 | 91066 | Arcadia | 78 | B | 2 (1 health) |
| 46 | 91077 | Arcadia | 78 | B | 2 (1 health) |
| 47 | 91214 | La Crescenta | 78 | B | 0 |
| 48 | 91784 | Upland | 78 | B | 0 |
| 49 | 93563 | Valyermo | 78 | B | 2 (1 health) |
| 50 | 91701 | Rancho Cucamonga | 77 | B | 3 |
Overview
California's 28th District encompasses 72 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (77/100).
164 EPA violations have been recorded across this district's water systems. 8 are health-based violations. About 60% 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 - 112 violations
- Total Coliform - 26 violations
- Stage 2 DBP Rule - 16 violations
- Stage 1 DBP Rule - 4 violations
- Lead - 3 violations
Housing Context
Homes in this district were built on average around 1957 (~69 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 72 ZIP codes in California's 28th District.