California — 33rd District
119th Congress · 27 ZIP codes · Avg score 73/100 · Grade B · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 27 ZIP codes in California's 33rd District: the district earns a grade B (73/100). 16 EPA violations on record, 5 health-based.
Top Contaminants
ZIP Codes in This District
27 ZIP codes tracked in California's 33rd District.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 92313 | Grand Terrace | 81 | B | 1 |
| 2 | 92359 | Mentone | 79 | B | 7 (1 health) |
| 3 | 92346 | Highland | 78 | B | 0 |
| 4 | 91730 | Rancho Cucamonga | 77 | B | 3 |
| 5 | 92316 | Bloomington | 75 | B | 0 |
| 6 | 92376 | Rialto | 75 | B | 0 |
| 7 | 92377 | Rialto | 75 | B | 0 |
| 8 | 92402 | San Bernardino | 75 | B | 0 |
| 9 | 92405 | San Bernardino | 75 | B | 0 |
| 10 | 92408 | San Bernardino | 75 | B | 0 |
| 11 | 92410 | San Bernardino | 75 | B | 0 |
| 12 | 92336 | Fontana | 72 | B | 0 |
| 13 | 92401 | San Bernardino | 72 | B | 0 |
| 14 | 92403 | San Bernardino | 72 | B | 0 |
| 15 | 92406 | San Bernardino | 72 | B | 0 |
| 16 | 92411 | San Bernardino | 72 | B | 0 |
| 17 | 92412 | San Bernardino | 72 | B | 0 |
| 18 | 92413 | San Bernardino | 72 | B | 0 |
| 19 | 92415 | San Bernardino | 72 | B | 0 |
| 20 | 92418 | San Bernardino | 72 | B | 0 |
| 21 | 92423 | San Bernardino | 72 | B | 0 |
| 22 | 92424 | San Bernardino | 72 | B | 0 |
| 23 | 92427 | San Bernardino | 72 | B | 0 |
| 24 | 92407 | San Bernardino | 70 | B | 0 |
| 25 | 92374 | Redlands | 67 | C | 5 (4 health) |
| 26 | 92404 | San Bernardino | 65 | C | 0 |
| 27 | 92369 | Patton | 53 | D | 0 |
Overview
California's 33rd District encompasses 27 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (73/100).
16 EPA violations have been recorded across this district's water systems. 5 are health-based violations. About 15% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Stage 1 DBP Rule - 4 violations
- Stage 2 DBP Rule - 4 violations
- Lead - 3 violations
- Contaminant 1032 - 3 violations
- Consumer Confidence Report Rule - 1 violation
Housing Context
Homes in this district were built on average around 1975 (~51 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 27 ZIP codes in California's 33rd District.