California — 9th District
119th Congress · 86 ZIP codes · Avg score 70/100 · Grade B · Updated 2026-06-03
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-06-03
Top Contaminants
ZIP Codes in This District
86 ZIP codes tracked in California's 9th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 94023 | Los Altos | 99 | A | 0 |
| 2 | 95230 | Farmington | 99 | A | 0 |
| 3 | 95241 | Lodi | 98 | A | 2 (1 health) |
| 4 | 95378 | Tracy | 98 | A | 2 (1 health) |
| 5 | 95391 | Tracy | 98 | A | 2 (1 health) |
| 6 | 94506 | Danville | 95 | A | 0 |
| 7 | 95237 | Lockeford | 95 | A | 0 |
| 8 | 95258 | Woodbridge | 95 | A | 0 |
| 9 | 95320 | Escalon | 95 | A | 0 |
| 10 | 95242 | Lodi | 94 | A | 2 (1 health) |
| 11 | 95377 | Tracy | 94 | A | 2 (1 health) |
| 12 | 94022 | Los Altos | 90 | A | 0 |
| 13 | 94024 | Los Altos | 90 | A | 0 |
| 14 | 94526 | Danville | 90 | A | 0 |
| 15 | 95330 | Lathrop | 90 | A | 0 |
| 16 | 91118 | San Marino | 89 | A | 0 |
| 17 | 95240 | Lodi | 89 | A | 2 (1 health) |
| 18 | 95376 | Tracy | 89 | A | 2 (1 health) |
| 19 | 91108 | San Marino | 88 | A | 0 |
| 20 | 95366 | Ripon | 88 | A | 0 |
| 21 | 95236 | Linden | 87 | A | 0 |
| 22 | 95336 | Manteca | 86 | A | 4 (1 health) |
| 23 | 95304 | Tracy | 84 | B | 2 (1 health) |
| 24 | 95776 | Woodland | 83 | B | 2 (1 health) |
| 25 | 95337 | Manteca | 81 | B | 4 (1 health) |
| 26 | 95640 | Ione | 80 | B | 4 |
| 27 | 94904 | Greenbrae | 78 | B | 1 |
| 28 | 95695 | Woodland | 78 | B | 2 (1 health) |
| 29 | 95689 | Volcano | 74 | B | 2 |
| 30 | 91775 | San Gabriel | 73 | B | 0 |
| 31 | 94528 | Diablo | 73 | B | 0 |
| 32 | 94913 | San Rafael | 73 | B | 0 |
| 33 | 94914 | Kentfield | 73 | B | 0 |
| 34 | 94979 | San Anselmo | 73 | B | 0 |
| 35 | 95227 | Clements | 73 | B | 0 |
| 36 | 95252 | Valley Springs | 73 | B | 0 |
| 37 | 95385 | Vernalis | 73 | B | 0 |
| 38 | 95669 | Plymouth | 71 | B | 13 (5 health) |
| 39 | 95675 | River Pines | 71 | B | 2 (1 health) |
| 40 | 94582 | San Ramon | 66 | C | 24 (14 health) |
| 41 | 94912 | San Rafael | 66 | C | 0 |
| 42 | 94978 | Fairfax | 66 | C | 0 |
| 43 | 95253 | Victor | 66 | C | 0 |
| 44 | 95697 | Yolo | 66 | C | 0 |
| 45 | 94583 | San Ramon | 65 | C | 24 (14 health) |
| 46 | 95629 | Fiddletown | 65 | C | 5 (3 health) |
| 47 | 95225 | Burson | 63 | C | 0 |
| 48 | 95226 | Campo Seco | 63 | C | 0 |
| 49 | 95245 | Mokelumne Hill | 63 | C | 0 |
| 50 | 95601 | Amador City | 63 | C | 0 |
Overview
California's 9th District serving an estimated 6,061,009 residents encompasses 86 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (70/100).
506 EPA violations have been recorded across this district's water systems. 347 are health-based violations. About 52% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Haloacetic Acids (HAA5) — 216 violations
- Lead — 86 violations
- Stage 2 DBP Rule — 61 violations
- Barium — 43 violations
- Stage 1 DBP Rule — 38 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.
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 86 ZIP codes in California's 9th District.