California — 18th District
119th Congress · 5 ZIP codes · Avg score 62/100 · Grade C · Updated 2026-06-03
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-06-03
Top Contaminants
ZIP Codes in This District
5 ZIP codes tracked in California's 18th District.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 95075 | Tres Pinos | 75 | B | 0 |
| 2 | 95043 | Paicines | 68 | C | 11 (1 health) |
| 3 | 95045 | San Juan Bautista | 68 | C | 6 (2 health) |
| 4 | 95024 | Hollister | 52 | D | 22 (10 health) |
| 5 | 95023 | Hollister | 48 | D | 22 (10 health) |
Overview
California's 18th District serving an estimated 111,487 residents encompasses 5 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (62/100).
61 EPA violations have been recorded across this district's water systems. 23 are health-based violations. About 80% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Haloacetic Acids (HAA5) — 20 violations
- Consumer Confidence Report Rule — 11 violations
- Total Trihalomethanes (TTHM) — 10 violations
- Barium — 8 violations
- Stage 2 DBP Rule — 8 violations
Housing Context
Homes in this district were built on average around 1982 (~44 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 5 ZIP codes in California's 18th District.