California — 27th District
119th Congress · 30 ZIP codes · Avg score 63/100 · Grade C · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 30 ZIP codes in California's 27th District: the district earns a grade C (63/100). 223 EPA violations on record, 177 health-based.
Top Contaminants
ZIP Codes in This District
30 ZIP codes tracked in California's 27th District.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 91310 | Castaic | 83 | B | 0 |
| 2 | 91322 | Newhall | 83 | B | 0 |
| 3 | 93552 | Palmdale | 83 | B | 1 |
| 4 | 93590 | Palmdale | 83 | B | 1 |
| 5 | 93599 | Palmdale | 83 | B | 1 |
| 6 | 91321 | Newhall | 78 | B | 0 |
| 7 | 91350 | Santa Clarita | 78 | B | 3 (2 health) |
| 8 | 91384 | Castaic | 78 | B | 0 |
| 9 | 93550 | Palmdale | 78 | B | 1 |
| 10 | 93551 | Palmdale | 78 | B | 1 |
| 11 | 91380 | Santa Clarita | 77 | B | 3 (2 health) |
| 12 | 91382 | Santa Clarita | 77 | B | 3 (2 health) |
| 13 | 91383 | Santa Clarita | 77 | B | 3 (2 health) |
| 14 | 91390 | Santa Clarita | 73 | B | 3 (2 health) |
| 15 | 93543 | Littlerock | 72 | B | 3 |
| 16 | 91381 | Stevenson Ranch | 63 | C | 0 |
| 17 | 91344 | Granada Hills | 55 | C | 0 |
| 18 | 91351 | Canyon Country | 55 | C | 0 |
| 19 | 93510 | Acton | 55 | C | 0 |
| 20 | 91386 | Canyon Country | 53 | D | 0 |
| 21 | 93532 | Lake Hughes | 53 | D | 17 (15 health) |
| 22 | 91387 | Canyon Country | 50 | D | 0 |
| 23 | 93534 | Lancaster | 48 | D | 24 (19 health) |
| 24 | 91354 | Valencia | 47 | D | 21 (19 health) |
| 25 | 91355 | Valencia | 47 | D | 21 (19 health) |
| 26 | 93536 | Lancaster | 43 | D | 24 (19 health) |
| 27 | 93539 | Lancaster | 36 | F | 24 (19 health) |
| 28 | 93584 | Lancaster | 36 | F | 24 (19 health) |
| 29 | 93586 | Lancaster | 36 | F | 24 (19 health) |
| 30 | 91385 | Valencia | 35 | F | 21 (19 health) |
Overview
California's 27th District encompasses 30 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (63/100).
223 EPA violations have been recorded across this district's water systems. 177 are health-based violations. About 67% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Barium - 158 violations
- Stage 2 DBP Rule - 18 violations
- Lead - 11 violations
- Total Trihalomethanes (TTHM) - 11 violations
- Stage 1 DBP Rule - 8 violations
Housing Context
Homes in this district were built on average around 1984 (~42 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 30 ZIP codes in California's 27th District.