California - 4th District
119th Congress · 70 ZIP codes · Avg score 95/100 · Grade A · Updated N/A
Data: EPA SDWIS / Census 119th Congress Last verified: N/A
ZipCheckup's versioned Home Safety Profile covers 70 ZIP codes in California's 4th District: the measured model 4.0.0 average is Grade A (95/100). 89 EPA violations on record, 41 health-based.
Top Contaminants
ZIP Codes in This District
70 ZIP codes tracked in California's 4th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 94571 | Rio Vista | 100 | A | 0 |
| 2 | 94589 | Vallejo | 100 | A | 0 |
| 3 | 95401 | Santa Rosa | 100 | A | 0 |
| 4 | 95451 | Kelseyville | 100 | A | 0 |
| 5 | 95458 | Lucerne | 100 | A | 0 |
| 6 | 95464 | Nice | 100 | A | 0 |
| 7 | 95467 | Hidden Valley Lake | 100 | A | 0 |
| 8 | 95616 | Davis | 100 | A | 1 |
| 9 | 95620 | Dixon | 100 | A | 0 |
| 10 | 95694 | Winters | 100 | A | 0 |
| 11 | 95695 | Woodland | 100 | A | 0 |
| 12 | 94931 | Cotati | 99 | A | 2 |
| 13 | 95407 | Santa Rosa | 99 | A | 2 |
| 14 | 95618 | Davis | 99 | A | 3 |
| 15 | 95776 | Woodland | 99 | A | 3 |
| 16 | 95422 | Clearlake | 97 | A | 4 (4 health) |
| 17 | 95453 | Lakeport | 96 | A | 3 (1 health) |
| 18 | 95405 | Santa Rosa | 95 | A | 3 (2 health) |
| 19 | 95409 | Santa Rosa | 95 | A | 3 (1 health) |
| 20 | 95404 | Santa Rosa | 89 | A | 11 (3 health) |
| 21 | 95442 | Glen Ellen | 83 | B | 0 |
| 22 | 95687 | Vacaville | 83 | B | 0 |
| 23 | 95688 | Vacaville | 83 | B | 0 |
| 24 | 94928 | Rohnert Park | 81 | B | 4 |
| 25 | 95476 | Sonoma | 69 | C | 9 (3 health) |
| 26 | 94503 | American Canyon | N/A | N/A | 2 (1 health) |
| 27 | 94508 | Angwin | N/A | N/A | 2 (2 health) |
| 28 | 94512 | Birds Landing | N/A | N/A | 0 |
| 29 | 94515 | Calistoga | N/A | N/A | 6 (5 health) |
| 30 | 94558 | Napa | N/A | N/A | 2 |
| 31 | 94559 | Napa | N/A | N/A | 0 |
| 32 | 94562 | Oakville | N/A | N/A | N/A |
| 33 | 94567 | Pope Valley | N/A | N/A | 2 (2 health) |
| 34 | 94573 | Rutherford | N/A | N/A | N/A |
| 35 | 94574 | Saint Helena | N/A | N/A | 9 (8 health) |
| 36 | 94576 | Deer Park | N/A | N/A | 2 (2 health) |
| 37 | 94581 | Napa | N/A | N/A | N/A |
| 38 | 94599 | Yountville | N/A | N/A | 3 (1 health) |
| 39 | 94926 | Rohnert Park | N/A | N/A | N/A |
| 40 | 94927 | Rohnert Park | N/A | N/A | N/A |
| 41 | 94951 | Penngrove | N/A | N/A | 2 |
| 42 | 95402 | Santa Rosa | N/A | N/A | N/A |
| 43 | 95406 | Santa Rosa | N/A | N/A | N/A |
| 44 | 95416 | Boyes Hot Springs | N/A | N/A | N/A |
| 45 | 95423 | Clearlake Oaks | N/A | N/A | 4 (4 health) |
| 46 | 95424 | Clearlake Park | N/A | N/A | N/A |
| 47 | 95426 | Cobb | N/A | N/A | 3 (1 health) |
| 48 | 95431 | Eldridge | N/A | N/A | N/A |
| 49 | 95433 | El Verano | N/A | N/A | N/A |
| 50 | 95435 | Finley | N/A | N/A | N/A |
Overview
California's 4th District encompasses 70 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is A (95/100).
89 EPA violations have been recorded across this district's water systems. 41 are health-based violations. About 57% of the 44 ZIP records with a reported violation count have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Stage 2 DBP Rule - 27 violations
- Consumer Confidence Report Rule - 17 violations
- Haloacetic Acids (HAA5) - 14 violations
- Total Trihalomethanes (TTHM) - 13 violations
- Stage 1 DBP Rule - 10 violations
Housing Context
Homes in this district were built on average around 1975 (~51 years old). Older homes may have lead pipes or solder - consider a water filter if your home predates 1986.
Data Sources
- Home Safety Score model 4.0.0: methodology and source contracts
- 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 70 ZIP codes in California's 4th District.