California — 9th District
119th Congress · 41 ZIP codes · Avg score 79/100 · Grade B · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 41 ZIP codes in California's 9th District: the district earns a grade B (79/100). 209 EPA violations on record, 139 health-based.
Top Contaminants
ZIP Codes in This District
41 ZIP codes tracked in California's 9th District.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 95230 | Farmington | 99 | A | 0 |
| 2 | 95241 | Lodi | 98 | A | 2 (1 health) |
| 3 | 95391 | Tracy | 98 | A | 2 (1 health) |
| 4 | 95258 | Woodbridge | 95 | A | 0 |
| 5 | 95320 | Escalon | 95 | A | 0 |
| 6 | 95242 | Lodi | 94 | A | 2 (1 health) |
| 7 | 95240 | Lodi | 89 | A | 2 (1 health) |
| 8 | 95376 | Tracy | 89 | A | 2 (1 health) |
| 9 | 95237 | Lockeford | 88 | A | 0 |
| 10 | 95366 | Ripon | 88 | A | 0 |
| 11 | 95236 | Linden | 87 | A | 0 |
| 12 | 95336 | Manteca | 86 | A | 3 (1 health) |
| 13 | 95304 | Tracy | 84 | B | 2 (1 health) |
| 14 | 95220 | Acampo | 83 | B | 0 |
| 15 | 95337 | Manteca | 81 | B | 3 (1 health) |
| 16 | 94505 | Discovery Bay | 78 | B | 0 |
| 17 | 95201 | Stockton | 77 | B | 9 (6 health) |
| 18 | 95202 | Stockton | 77 | B | 9 (6 health) |
| 19 | 95205 | Stockton | 77 | B | 9 (6 health) |
| 20 | 95208 | Stockton | 77 | B | 9 (6 health) |
| 21 | 95209 | Stockton | 77 | B | 9 (6 health) |
| 22 | 95210 | Stockton | 77 | B | 9 (6 health) |
| 23 | 95211 | Stockton | 77 | B | 9 (6 health) |
| 24 | 95213 | Stockton | 77 | B | 9 (6 health) |
| 25 | 95214 | Stockton | 77 | B | 9 (6 health) |
| 26 | 95267 | Stockton | 77 | B | 9 (6 health) |
| 27 | 95269 | Stockton | 77 | B | 9 (6 health) |
| 28 | 95296 | Stockton | 77 | B | 9 (6 health) |
| 29 | 95297 | Stockton | 77 | B | 9 (6 health) |
| 30 | 95227 | Clements | 73 | B | 0 |
| 31 | 95203 | Stockton | 72 | B | 9 (6 health) |
| 32 | 95204 | Stockton | 72 | B | 9 (6 health) |
| 33 | 95206 | Stockton | 72 | B | 9 (6 health) |
| 34 | 95207 | Stockton | 72 | B | 9 (6 health) |
| 35 | 95212 | Stockton | 72 | B | 9 (6 health) |
| 36 | 95215 | Stockton | 72 | B | 9 (6 health) |
| 37 | 95219 | Stockton | 72 | B | 9 (6 health) |
| 38 | 95253 | Victor | 66 | C | 0 |
| 39 | 95686 | Thornton | 65 | C | 0 |
| 40 | 95231 | French Camp | 62 | C | 11 (11 health) |
| 41 | 95234 | Holt | 53 | D | 0 |
Overview
California's 9th District encompasses 41 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (79/100).
209 EPA violations have been recorded across this district's water systems. 139 are health-based violations. About 71% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Haloacetic Acids (HAA5) - 103 violations
- Stage 2 DBP Rule - 47 violations
- Lead - 25 violations
- Stage 1 DBP Rule - 20 violations
- Barium - 8 violations
Housing Context
Homes in this district were built on average around 1981 (~45 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 41 ZIP codes in California's 9th District.