California — 23rd District
119th Congress · 76 ZIP codes · Avg score 65/100 · Grade C · Updated 2026-03-22
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-03-22
Top Contaminants
ZIP Codes in This District
76 ZIP codes tracked in California's 23rd District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 92321 | Cedar Glen | 91 | A | 12 (1 health) |
| 2 | 92350 | Loma Linda | 83 | B | 1 |
| 3 | 92357 | Loma Linda | 83 | B | 1 |
| 4 | 92392 | Victorville | 83 | B | 0 |
| 5 | 92393 | Victorville | 83 | B | 0 |
| 6 | 92394 | Victorville | 83 | B | 0 |
| 7 | 92395 | Victorville | 83 | B | 0 |
| 8 | 93562 | Trona | 83 | B | 0 |
| 9 | 93591 | Palmdale | 83 | B | 1 |
| 10 | 93592 | Trona | 83 | B | 0 |
| 11 | 92286 | Yucca Valley | 79 | B | 1 |
| 12 | 92301 | Adelanto | 79 | B | 51 (1 health) |
| 13 | 92382 | Running Springs | 79 | B | 12 (1 health) |
| 14 | 93504 | California City | 79 | B | 2 |
| 15 | 93505 | California City | 79 | B | 2 |
| 16 | 93519 | Cantil | 79 | B | 2 (1 health) |
| 17 | 92308 | Apple Valley | 78 | B | 4 |
| 18 | 92354 | Loma Linda | 78 | B | 1 |
| 19 | 92366 | Mountain Pass | 78 | B | 2 (1 health) |
| 20 | 92305 | Angelus Oaks | 75 | B | 17 (2 health) |
| 21 | 92371 | Phelan | 75 | B | 0 |
| 22 | 93596 | Boron | 75 | B | 0 |
| 23 | 92284 | Yucca Valley | 74 | B | 1 |
| 24 | 92307 | Apple Valley | 73 | B | 4 |
| 25 | 92325 | Crestline | 73 | B | 2 (1 health) |
| 26 | 92278 | Twentynine Palms | 72 | B | 0 |
| 27 | 92310 | Fort Irwin | 72 | B | 0 |
| 28 | 92329 | Phelan | 72 | B | 0 |
| 29 | 92342 | Helendale | 72 | B | 0 |
| 30 | 92414 | San Bernardino | 72 | B | 0 |
| 31 | 93516 | Boron | 72 | B | 0 |
| 32 | 92314 | Big Bear City | 70 | B | 0 |
| 33 | 92385 | Skyforest | 70 | B | 0 |
| 34 | 92398 | Yermo | 70 | B | 1 |
| 35 | 92356 | Lucerne Valley | 69 | C | 0 |
| 36 | 92252 | Joshua Tree | 68 | C | 0 |
| 37 | 92341 | Green Valley Lake | 68 | C | 6 (2 health) |
| 38 | 92309 | Baker | 67 | C | 7 |
| 39 | 92340 | Hesperia | 67 | C | 4 (1 health) |
| 40 | 92344 | Hesperia | 67 | C | 4 (1 health) |
| 41 | 92375 | Redlands | 67 | C | 5 (4 health) |
| 42 | 92345 | Hesperia | 66 | C | 4 (1 health) |
| 43 | 92277 | Twentynine Palms | 65 | C | 0 |
| 44 | 92256 | Morongo Valley | 63 | C | 0 |
| 45 | 92372 | Pinon Hills | 63 | C | 0 |
| 46 | 92386 | Sugarloaf | 63 | C | 0 |
| 47 | 92373 | Redlands | 62 | C | 5 (4 health) |
| 48 | 92324 | Colton | 57 | C | 10 |
| 49 | 92333 | Fawnskin | 56 | C | 7 (2 health) |
| 50 | 92399 | Yucaipa | 56 | C | 11 (5 health) |
Overview
California's 23rd District serving an estimated 2,580,975 residents encompasses 76 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (65/100).
514 EPA violations have been recorded across this district's water systems. 278 are health-based violations. About 51% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Barium — 172 violations
- Consumer Confidence Report Rule — 55 violations
- Lead — 53 violations
- Stage 2 DBP Rule — 48 violations
- Combined Radium — 48 violations
Housing Context
Homes in this district were built on average around 1976 (~50 years old). Older homes may have lead pipes or solder — consider a water filter if your home predates 1986.
Lead Alert: 5 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 76 ZIP codes in California's 23rd District.