California — 40th District
119th Congress · 39 ZIP codes · Avg score 88/100 · Grade A · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 39 ZIP codes in California's 40th District: the district earns a grade A (88/100). 41 EPA violations on record, 4 health-based.
Top Contaminants
ZIP Codes in This District
39 ZIP codes tracked in California's 40th District.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 92654 | Laguna Hills | 99 | A | 0 |
| 2 | 92688 | Rancho Santa Margarita | 99 | A | 1 |
| 3 | 92856 | Orange | 99 | A | 0 |
| 4 | 92859 | Orange | 99 | A | 0 |
| 5 | 92862 | Orange | 99 | A | 0 |
| 6 | 92863 | Orange | 99 | A | 0 |
| 7 | 92864 | Orange | 99 | A | 0 |
| 8 | 92817 | Anaheim | 98 | A | 2 |
| 9 | 92885 | Yorba Linda | 97 | A | 2 |
| 10 | 92618 | Irvine | 96 | A | 6 |
| 11 | 92623 | Irvine | 96 | A | 6 |
| 12 | 92710 | Irvine | 96 | A | 6 |
| 13 | 92781 | Tustin | 96 | A | 1 |
| 14 | 92782 | Tustin | 96 | A | 1 |
| 15 | 92678 | Trabuco Canyon | 95 | A | 0 |
| 16 | 92866 | Orange | 95 | A | 0 |
| 17 | 92867 | Orange | 95 | A | 0 |
| 18 | 92808 | Anaheim | 94 | A | 2 |
| 19 | 92887 | Yorba Linda | 93 | A | 2 |
| 20 | 92780 | Tustin | 92 | A | 1 |
| 21 | 92653 | Laguna Hills | 90 | A | 0 |
| 22 | 92679 | Trabuco Canyon | 90 | A | 0 |
| 23 | 92869 | Orange | 90 | A | 0 |
| 24 | 92807 | Anaheim | 89 | A | 2 |
| 25 | 92711 | Santa Ana | 88 | A | 1 |
| 26 | 92823 | Brea | 88 | A | 0 |
| 27 | 92886 | Yorba Linda | 88 | A | 2 |
| 28 | 92861 | Villa Park | 87 | A | 0 |
| 29 | 91709 | Chino Hills | 83 | B | 0 |
| 30 | 92705 | Santa Ana | 82 | B | 1 |
| 31 | 92630 | Lake Forest | 80 | B | 5 (4 health) |
| 32 | 92610 | Foothill Ranch | 73 | B | 0 |
| 33 | 92656 | Aliso Viejo | 73 | B | 0 |
| 34 | 92691 | Mission Viejo | 73 | B | 0 |
| 35 | 92692 | Mission Viejo | 73 | B | 0 |
| 36 | 92609 | El Toro | 66 | C | 0 |
| 37 | 92637 | Laguna Woods | 66 | C | 0 |
| 38 | 92690 | Mission Viejo | 66 | C | 0 |
| 39 | 92676 | Silverado | 60 | C | 0 |
Overview
California's 40th District encompasses 39 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is A (88/100).
41 EPA violations have been recorded across this district's water systems. 4 are health-based violations. About 41% 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 - 20 violations
- Total Trihalomethanes (TTHM) - 9 violations
- Haloacetic Acids (HAA5) - 4 violations
- Lead - 3 violations
- Stage 1 DBP Rule - 3 violations
Housing Context
Homes in this district were built on average around 1979 (~47 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 39 ZIP codes in California's 40th District.