California — 16th District
119th Congress · 53 ZIP codes · Avg score 75/100 · Grade B · Updated 2026-07-19
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-19
ZipCheckup tracks water safety for 53 ZIP codes in California's 16th District: the district earns a grade B (75/100). 38 EPA violations on record, 23 health-based.
Top Contaminants
ZIP Codes in This District
53 ZIP codes tracked in California's 16th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 94021 | Loma Mar | 83 | B | 0 |
| 2 | 94023 | Los Altos | 83 | B | 0 |
| 3 | 94026 | Menlo Park | 83 | B | 0 |
| 4 | 94302 | Palo Alto | 83 | B | 0 |
| 5 | 94304 | Palo Alto | 83 | B | 0 |
| 6 | 94309 | Palo Alto | 83 | B | 0 |
| 7 | 95071 | Saratoga | 83 | B | 1 |
| 8 | 94064 | Redwood City | 82 | B | 1 (1 health) |
| 9 | 95111 | San Jose | 82 | B | 1 (1 health) |
| 10 | 95118 | San Jose | 82 | B | 1 (1 health) |
| 11 | 95121 | San Jose | 82 | B | 1 (1 health) |
| 12 | 95124 | San Jose | 82 | B | 1 (1 health) |
| 13 | 95128 | San Jose | 82 | B | 1 (1 health) |
| 14 | 95130 | San Jose | 82 | B | 1 (1 health) |
| 15 | 95151 | San Jose | 82 | B | 1 (1 health) |
| 16 | 95154 | San Jose | 82 | B | 1 (1 health) |
| 17 | 95155 | San Jose | 82 | B | 1 (1 health) |
| 18 | 95157 | San Jose | 82 | B | 1 (1 health) |
| 19 | 95158 | San Jose | 82 | B | 1 (1 health) |
| 20 | 95032 | Los Gatos | 79 | B | 2 (1 health) |
| 21 | 94019 | Half Moon Bay | 78 | B | 0 |
| 22 | 94022 | Los Altos | 78 | B | 0 |
| 23 | 94024 | Los Altos | 78 | B | 0 |
| 24 | 94306 | Palo Alto | 78 | B | 0 |
| 25 | 95031 | Los Gatos | 78 | B | 2 (1 health) |
| 26 | 95070 | Saratoga | 78 | B | 1 |
| 27 | 94062 | Redwood City | 77 | B | 1 (1 health) |
| 28 | 94040 | Mountain View | 76 | B | 0 |
| 29 | 94043 | Mountain View | 76 | B | 0 |
| 30 | 94037 | Montara | 75 | B | 0 |
| 31 | 94020 | La Honda | 74 | B | 5 (4 health) |
| 32 | 94035 | Mountain View | 74 | B | 0 |
| 33 | 94039 | Mountain View | 74 | B | 0 |
| 34 | 94041 | Mountain View | 74 | B | 0 |
| 35 | 94042 | Mountain View | 74 | B | 0 |
| 36 | 95030 | Los Gatos | 74 | B | 2 (1 health) |
| 37 | 95033 | Los Gatos | 74 | B | 2 (1 health) |
| 38 | 94025 | Menlo Park | 73 | B | 0 |
| 39 | 94044 | Pacifica | 73 | B | 0 |
| 40 | 94074 | San Gregorio | 73 | B | 0 |
| 41 | 94301 | Palo Alto | 73 | B | 0 |
| 42 | 94305 | Stanford | 72 | B | 0 |
| 43 | 95125 | San Jose | 72 | B | 1 (1 health) |
| 44 | 94027 | Atherton | 65 | C | 0 |
| 45 | 94018 | El Granada | 63 | C | 0 |
| 46 | 94038 | Moss Beach | 63 | C | 0 |
| 47 | 94060 | Pescadero | 63 | C | 9 (1 health) |
| 48 | 95008 | Campbell | 63 | C | 0 |
| 49 | 94028 | Portola Valley | 55 | C | 0 |
| 50 | 95009 | Campbell | 53 | D | 0 |
Overview
California's 16th District encompasses 53 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (75/100).
38 EPA violations have been recorded across this district's water systems. 23 are health-based violations. About 42% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- E. coli - 13 violations
- Total Trihalomethanes (TTHM) - 8 violations
- Stage 2 DBP Rule - 8 violations
- Mercury - 4 violations
- Consumer Confidence Report Rule - 2 violations
Housing Context
Homes in this district were built on average around 1967 (~59 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 53 ZIP codes in California's 16th District.