CONGRESSIONAL DISTRICT CA

California — 10th District

119th Congress · 25 ZIP codes · Avg score 67/100 · Grade C · Updated 2026-06-03

Data: EPA SDWIS / Census 119th Congress Last verified: 2026-06-03

C
District Grade
67
Avg Safety Score
25
ZIP Codes
122
Total Violations
98
Health Violations
33
Water Systems
Best ZIP: 95670 (83/100)
Lowest ZIP: 94575 (45/100)

Top Contaminants

Barium (90) Stage 2 DBP Rule (16) Stage 1 DBP Rule (13) Consumer Confidence Report Rule (3)

ZIP Codes in This District

25 ZIP codes tracked in California's 10th District.

# ZIP Code City Safety Score Grade Violations
1 95670 Rancho Cordova 83 B 0
2 95741 Rancho Cordova 83 B 0
3 95742 Rancho Cordova 83 B 0
4 94516 Canyon 81 B 1
5 94505 Discovery Bay 78 B 0
6 94565 Pittsburg 78 B 0
7 94597 Walnut Creek 76 B 1
8 94598 Walnut Creek 76 B 1
9 94531 Antioch 75 B 0
10 94553 Martinez 73 B 0
11 94595 Walnut Creek 71 B 1
12 94596 Walnut Creek 71 B 1
13 94513 Brentwood 70 B 6 (2 health)
14 94511 Bethel Island 69 C 2
15 94509 Antioch 65 C 0
16 94548 Knightsen 63 C 0
17 94517 Clayton 58 C 1
18 94507 Alamo 55 C 0
19 94514 Byron 55 C 0
20 95683 Sloughhouse 55 C 0
21 94556 Moraga 54 D 18 (14 health)
22 94561 Oakley 53 D 54 (54 health)
23 94549 Lafayette 50 D 0
24 94570 Moraga 45 D 18 (14 health)
25 94575 Moraga 45 D 18 (14 health)

Overview

California's 10th District serving an estimated 963,521 residents encompasses 25 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (67/100).

122 EPA violations have been recorded across this district's water systems. 98 are health-based violations. About 48% of tracked ZIP codes have at least one violation.

Top Contaminants

The most frequently cited water quality issues in this district:

  • Barium — 90 violations
  • Stage 2 DBP Rule — 16 violations
  • Stage 1 DBP Rule — 13 violations
  • Consumer Confidence Report 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

Updated daily. Data covers 25 ZIP codes in California's 10th District.

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