California — 18th District
119th Congress · 51 ZIP codes · Avg score 74/100 · Grade B · Updated 2026-07-19
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-19
ZipCheckup tracks water safety for 51 ZIP codes in California's 18th District: the district earns a grade B (74/100). 144 EPA violations on record, 81 health-based.
Top Contaminants
ZIP Codes in This District
51 ZIP codes tracked in California's 18th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 95004 | Aromas | 83 | B | 0 |
| 2 | 95077 | Watsonville | 83 | B | 0 |
| 3 | 95140 | Mount Hamilton | 83 | B | 0 |
| 4 | 95019 | Freedom | 82 | B | 3 |
| 5 | 95021 | Gilroy | 82 | B | 1 (1 health) |
| 6 | 95103 | San Jose | 82 | B | 1 (1 health) |
| 7 | 95106 | San Jose | 82 | B | 1 (1 health) |
| 8 | 95108 | San Jose | 82 | B | 1 (1 health) |
| 9 | 95109 | San Jose | 82 | B | 1 (1 health) |
| 10 | 95113 | San Jose | 82 | B | 1 (1 health) |
| 11 | 95115 | San Jose | 82 | B | 1 (1 health) |
| 12 | 95141 | San Jose | 82 | B | 1 (1 health) |
| 13 | 95156 | San Jose | 82 | B | 1 (1 health) |
| 14 | 95159 | San Jose | 82 | B | 1 (1 health) |
| 15 | 95172 | San Jose | 82 | B | 1 (1 health) |
| 16 | 95173 | San Jose | 82 | B | 1 (1 health) |
| 17 | 95192 | San Jose | 82 | B | 1 (1 health) |
| 18 | 95196 | San Jose | 82 | B | 1 (1 health) |
| 19 | 93932 | Lockwood | 81 | B | 1 |
| 20 | 93960 | Soledad | 81 | B | 2 |
| 21 | 93450 | San Ardo | 78 | B | 2 (1 health) |
| 22 | 93912 | Salinas | 78 | B | 3 |
| 23 | 93915 | Salinas | 78 | B | 3 |
| 24 | 93954 | San Lucas | 78 | B | 3 (1 health) |
| 25 | 95020 | Gilroy | 77 | B | 1 (1 health) |
| 26 | 95038 | Morgan Hill | 77 | B | 3 (1 health) |
| 27 | 95122 | San Jose | 77 | B | 1 (1 health) |
| 28 | 95127 | San Jose | 77 | B | 1 (1 health) |
| 29 | 95075 | Tres Pinos | 75 | B | 0 |
| 30 | 93901 | Salinas | 74 | B | 3 |
| 31 | 93902 | Salinas | 74 | B | 3 |
| 32 | 93905 | Salinas | 74 | B | 3 |
| 33 | 93906 | Salinas | 74 | B | 3 |
| 34 | 93930 | King City | 73 | B | 0 |
| 35 | 93451 | San Miguel | 72 | B | 0 |
| 36 | 95110 | San Jose | 72 | B | 1 (1 health) |
| 37 | 95112 | San Jose | 72 | B | 1 (1 health) |
| 38 | 95116 | San Jose | 72 | B | 1 (1 health) |
| 39 | 93426 | Bradley | 69 | C | 10 (5 health) |
| 40 | 95043 | Paicines | 68 | C | 4 (1 health) |
| 41 | 95076 | Watsonville | 68 | C | 0 |
| 42 | 95024 | Hollister | 67 | C | 8 (4 health) |
| 43 | 95037 | Morgan Hill | 67 | C | 3 (1 health) |
| 44 | 93927 | Greenfield | 66 | C | 5 (1 health) |
| 45 | 95045 | San Juan Bautista | 66 | C | 7 (3 health) |
| 46 | 93925 | Chualar | 64 | C | 2 (1 health) |
| 47 | 95023 | Hollister | 60 | C | 8 (4 health) |
| 48 | 93926 | Gonzales | 53 | D | 22 (17 health) |
| 49 | 93928 | Jolon | 53 | D | 0 |
| 50 | 95012 | Castroville | 53 | D | 22 (21 health) |
Overview
California's 18th District encompasses 51 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (74/100).
144 EPA violations have been recorded across this district's water systems. 81 are health-based violations. About 84% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Lead - 45 violations
- Stage 2 DBP Rule - 25 violations
- Consumer Confidence Report Rule - 23 violations
- E. coli - 18 violations
- Total Trihalomethanes (TTHM) - 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.
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 51 ZIP codes in California's 18th District.