CONGRESSIONAL DISTRICT CA

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

B
District Grade
71
Avg Safety Score
343
ZIP Codes
1436
Total Violations
246
Health Violations
135
Water Systems
Best ZIP: 90220 (83/100)
Lowest ZIP: 93544 (35/100)

Top Contaminants

Consumer Confidence Report Rule (631) Barium (190) Total Trihalomethanes (TTHM) (113) Contaminant 2414 (55) Bromochloroacetic Acid (54)

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

Updated daily. Data covers 343 ZIP codes in California's 31st District.

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