California — 31st District
119th Congress · 343 ZIP codes · Avg score 71/100 · Grade B · 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 31st District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 90220 | Compton | 83 | B | 0 |
| 2 | 90221 | Compton | 83 | B | 0 |
| 3 | 90222 | Compton | 83 | B | 0 |
| 4 | 90223 | Compton | 83 | B | 0 |
| 5 | 90224 | Compton | 83 | B | 0 |
| 6 | 90239 | Downey | 83 | B | 1 |
| 7 | 90241 | Downey | 83 | B | 1 |
| 8 | 90242 | Downey | 83 | B | 1 |
| 9 | 90250 | Hawthorne | 83 | B | 1 |
| 10 | 90251 | Hawthorne | 83 | B | 1 |
| 11 | 90267 | Manhattan Beach | 83 | B | 0 |
| 12 | 90280 | South Gate | 83 | B | 0 |
| 13 | 90401 | Santa Monica | 83 | B | 0 |
| 14 | 90404 | Santa Monica | 83 | B | 0 |
| 15 | 90406 | Santa Monica | 83 | B | 0 |
| 16 | 90407 | Santa Monica | 83 | B | 0 |
| 17 | 90408 | Santa Monica | 83 | B | 0 |
| 18 | 90409 | Santa Monica | 83 | B | 0 |
| 19 | 90410 | Santa Monica | 83 | B | 0 |
| 20 | 90411 | Santa Monica | 83 | B | 0 |
| 21 | 90601 | Whittier | 83 | B | 0 |
| 22 | 90602 | Whittier | 83 | B | 0 |
| 23 | 90603 | Whittier | 83 | B | 0 |
| 24 | 90604 | Whittier | 83 | B | 0 |
| 25 | 90605 | Whittier | 83 | B | 0 |
| 26 | 90606 | Whittier | 83 | B | 0 |
| 27 | 90607 | Whittier | 83 | B | 0 |
| 28 | 90608 | Whittier | 83 | B | 0 |
| 29 | 90609 | Whittier | 83 | B | 0 |
| 30 | 90610 | Whittier | 83 | B | 0 |
| 31 | 90612 | Whittier | 83 | B | 0 |
| 32 | 90704 | Avalon | 83 | B | 0 |
| 33 | 90707 | Bellflower | 83 | B | 0 |
| 34 | 91012 | La Canada Flintridge | 83 | B | 0 |
| 35 | 91201 | Glendale | 83 | B | 0 |
| 36 | 91202 | Glendale | 83 | B | 0 |
| 37 | 91203 | Glendale | 83 | B | 0 |
| 38 | 91204 | Glendale | 83 | B | 0 |
| 39 | 91205 | Glendale | 83 | B | 0 |
| 40 | 91207 | Glendale | 83 | B | 0 |
| 41 | 91209 | Glendale | 83 | B | 0 |
| 42 | 91210 | Glendale | 83 | B | 0 |
| 43 | 91221 | Glendale | 83 | B | 0 |
| 44 | 91222 | Glendale | 83 | B | 0 |
| 45 | 91224 | La Crescenta | 83 | B | 0 |
| 46 | 91225 | Glendale | 83 | B | 0 |
| 47 | 91226 | Glendale | 83 | B | 0 |
| 48 | 91310 | Castaic | 83 | B | 0 |
| 49 | 91322 | Newhall | 83 | B | 0 |
| 50 | 91340 | San Fernando | 83 | B | 0 |
Overview
California's 31st District serving an estimated 45,152,075 residents encompasses 343 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (71/100).
1436 EPA violations have been recorded across this district's water systems. 246 are health-based violations. About 30% 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 — 631 violations
- Barium — 190 violations
- Total Trihalomethanes (TTHM) — 113 violations
- Contaminant 2414 — 55 violations
- Bromochloroacetic Acid — 54 violations
Housing Context
Homes in this district were built on average around 1965 (~61 years old). Older homes may have lead pipes or solder — consider a water filter if your home predates 1986.
Lead Alert: 1 ZIP code 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 343 ZIP codes in California's 31st District.