California — 33rd District
119th Congress · 100 ZIP codes · Avg score 68/100 · Grade C · Updated 2026-06-03
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-06-03
Top Contaminants
ZIP Codes in This District
100 ZIP codes tracked in California's 33rd District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 91709 | Chino Hills | 83 | B | 0 |
| 2 | 91785 | Upland | 83 | B | 0 |
| 3 | 91786 | Upland | 83 | B | 0 |
| 4 | 92350 | Loma Linda | 83 | B | 1 |
| 5 | 92357 | Loma Linda | 83 | B | 1 |
| 6 | 92392 | Victorville | 83 | B | 0 |
| 7 | 92393 | Victorville | 83 | B | 0 |
| 8 | 92394 | Victorville | 83 | B | 0 |
| 9 | 92395 | Victorville | 83 | B | 0 |
| 10 | 93562 | Trona | 83 | B | 0 |
| 11 | 93592 | Trona | 83 | B | 0 |
| 12 | 92313 | Grand Terrace | 81 | B | 1 |
| 13 | 92286 | Yucca Valley | 79 | B | 1 |
| 14 | 92301 | Adelanto | 79 | B | 51 (1 health) |
| 15 | 92359 | Mentone | 79 | B | 68 (1 health) |
| 16 | 92382 | Running Springs | 79 | B | 12 (1 health) |
| 17 | 91784 | Upland | 78 | B | 0 |
| 18 | 92308 | Apple Valley | 78 | B | 4 |
| 19 | 92346 | Highland | 78 | B | 0 |
| 20 | 92354 | Loma Linda | 78 | B | 1 |
| 21 | 92366 | Mountain Pass | 78 | B | 2 (1 health) |
| 22 | 92363 | Needles | 77 | B | 3 |
| 23 | 92358 | Lytle Creek | 76 | B | 0 |
| 24 | 92305 | Angelus Oaks | 75 | B | 17 (2 health) |
| 25 | 92316 | Bloomington | 75 | B | 0 |
| 26 | 92337 | Fontana | 75 | B | 0 |
| 27 | 92371 | Phelan | 75 | B | 0 |
| 28 | 92376 | Rialto | 75 | B | 0 |
| 29 | 92377 | Rialto | 75 | B | 0 |
| 30 | 92402 | San Bernardino | 75 | B | 0 |
| 31 | 92405 | San Bernardino | 75 | B | 0 |
| 32 | 92408 | San Bernardino | 75 | B | 0 |
| 33 | 92410 | San Bernardino | 75 | B | 0 |
| 34 | 92284 | Yucca Valley | 74 | B | 1 |
| 35 | 92307 | Apple Valley | 73 | B | 4 |
| 36 | 92325 | Crestline | 73 | B | 2 (1 health) |
| 37 | 91763 | Montclair | 72 | B | 0 |
| 38 | 92278 | Twentynine Palms | 72 | B | 0 |
| 39 | 92310 | Fort Irwin | 72 | B | 0 |
| 40 | 92329 | Phelan | 72 | B | 0 |
| 41 | 92331 | Fontana | 72 | B | 0 |
| 42 | 92334 | Fontana | 72 | B | 0 |
| 43 | 92336 | Fontana | 72 | B | 0 |
| 44 | 92342 | Helendale | 72 | B | 0 |
| 45 | 92401 | San Bernardino | 72 | B | 0 |
| 46 | 92403 | San Bernardino | 72 | B | 0 |
| 47 | 92406 | San Bernardino | 72 | B | 0 |
| 48 | 92411 | San Bernardino | 72 | B | 0 |
| 49 | 92412 | San Bernardino | 72 | B | 0 |
| 50 | 92413 | San Bernardino | 72 | B | 0 |
Overview
California's 33rd District serving an estimated 10,886,764 residents encompasses 100 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (68/100).
526 EPA violations have been recorded across this district's water systems. 255 are health-based violations. About 34% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Barium — 154 violations
- Lead — 52 violations
- Combined Radium — 48 violations
- Consumer Confidence Report Rule — 42 violations
- Stage 2 DBP Rule — 36 violations
Housing Context
Homes in this district were built on average around 1977 (~49 years old). Older homes may have lead pipes or solder — consider a water filter if your home predates 1986.
Lead Alert: 4 ZIP codes in this district exceed the EPA action level for lead. Consider using a certified lead-removal filter.
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 100 ZIP codes in California's 33rd District.