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
Top Contaminants
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
- 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 25 ZIP codes in California's 10th District.