California — 26th District
119th Congress · 39 ZIP codes · Avg score 61/100 · Grade C · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 39 ZIP codes in California's 26th District: the district earns a grade C (61/100). 59 EPA violations on record, 12 health-based.
Top Contaminants
ZIP Codes in This District
39 ZIP codes tracked in California's 26th District.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 91363 | Thousand Oaks | 83 | B | 0 |
| 2 | 91359 | Westlake Village | 82 | B | 0 |
| 3 | 91376 | Agoura Hills | 78 | B | 2 (1 health) |
| 4 | 91302 | Calabasas | 73 | B | 0 |
| 5 | 93021 | Moorpark | 70 | B | 0 |
| 6 | 91358 | Thousand Oaks | 66 | C | 0 |
| 7 | 93011 | Camarillo | 66 | C | 1 |
| 8 | 93016 | Fillmore | 66 | C | 3 (1 health) |
| 9 | 93020 | Moorpark | 66 | C | 0 |
| 10 | 93033 | Oxnard | 66 | C | 3 (1 health) |
| 11 | 93061 | Santa Paula | 66 | C | 0 |
| 12 | 91360 | Thousand Oaks | 65 | C | 0 |
| 13 | 91362 | Thousand Oaks | 65 | C | 0 |
| 14 | 91361 | Westlake Village | 64 | C | 0 |
| 15 | 93040 | Piru | 63 | C | 0 |
| 16 | 93066 | Somis | 63 | C | 0 |
| 17 | 93062 | Simi Valley | 62 | C | 3 |
| 18 | 93093 | Simi Valley | 62 | C | 3 |
| 19 | 93094 | Simi Valley | 62 | C | 3 |
| 20 | 93099 | Simi Valley | 62 | C | 3 |
| 21 | 93010 | Camarillo | 61 | C | 1 |
| 22 | 93012 | Camarillo | 61 | C | 1 |
| 23 | 93015 | Fillmore | 61 | C | 3 (1 health) |
| 24 | 93030 | Oxnard | 61 | C | 3 (1 health) |
| 25 | 93032 | Oxnard | 61 | C | 3 (1 health) |
| 26 | 93036 | Oxnard | 61 | C | 3 (1 health) |
| 27 | 93063 | Simi Valley | 61 | C | 3 |
| 28 | 93041 | Port Hueneme | 60 | C | 2 |
| 29 | 93060 | Santa Paula | 60 | C | 0 |
| 30 | 93009 | Ventura | 57 | C | 11 (4 health) |
| 31 | 93035 | Oxnard | 56 | C | 3 (1 health) |
| 32 | 93065 | Simi Valley | 56 | C | 3 |
| 33 | 93044 | Port Hueneme | 53 | D | 2 |
| 34 | 93064 | Brandeis | 53 | D | 0 |
| 35 | 91320 | Newbury Park | 45 | D | 0 |
| 36 | 91377 | Oak Park | 45 | D | 0 |
| 37 | 91319 | Newbury Park | 40 | D | 0 |
| 38 | 93042 | Point Mugu Nawc | 40 | D | 0 |
| 39 | 93043 | Port Hueneme Cbc Base | 40 | D | 0 |
Overview
California's 26th District encompasses 39 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (61/100).
59 EPA violations have been recorded across this district's water systems. 12 are health-based violations. About 51% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Consumer Confidence Report Rule - 19 violations
- Stage 2 DBP Rule - 18 violations
- Surface Water Treatment Rule - 13 violations
- Lead - 9 violations
Housing Context
Homes in this district were built on average around 1978 (~48 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 39 ZIP codes in California's 26th District.