California — 20th District
119th Congress · 236 ZIP codes · Avg score 65/100 · Grade C · Updated 2026-06-03
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-06-03
Top Contaminants
ZIP Codes in This District
100 ZIP codes tracked in California's 20th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 91031 | South Pasadena | 83 | B | 0 |
| 2 | 93206 | Buttonwillow | 83 | B | 0 |
| 3 | 93215 | Delano | 83 | B | 0 |
| 4 | 93216 | Delano | 83 | B | 0 |
| 5 | 93222 | Pine Mountain Club | 83 | B | 0 |
| 6 | 93226 | Glennville | 83 | B | 0 |
| 7 | 93268 | Taft | 83 | B | 0 |
| 8 | 93280 | Wasco | 83 | B | 0 |
| 9 | 93531 | Keene | 83 | B | 0 |
| 10 | 93552 | Palmdale | 83 | B | 1 |
| 11 | 93556 | Ridgecrest | 83 | B | 0 |
| 12 | 93590 | Palmdale | 83 | B | 1 |
| 13 | 93591 | Palmdale | 83 | B | 1 |
| 14 | 93599 | Palmdale | 83 | B | 1 |
| 15 | 93641 | Miramonte | 83 | B | 0 |
| 16 | 93955 | Seaside | 83 | B | 0 |
| 17 | 95077 | Watsonville | 83 | B | 0 |
| 18 | 93249 | Lost Hills | 82 | B | 3 |
| 19 | 91770 | Rosemead | 81 | B | 2 |
| 20 | 91771 | Rosemead | 81 | B | 2 |
| 21 | 91772 | Rosemead | 81 | B | 2 |
| 22 | 93606 | Biola | 81 | B | 1 |
| 23 | 93238 | Kernville | 79 | B | 4 (4 health) |
| 24 | 93443 | Morro Bay | 79 | B | 3 (3 health) |
| 25 | 93504 | California City | 79 | B | 2 |
| 26 | 93505 | California City | 79 | B | 2 |
| 27 | 93519 | Cantil | 79 | B | 2 (1 health) |
| 28 | 93602 | Auberry | 79 | B | 2 |
| 29 | 91030 | South Pasadena | 78 | B | 0 |
| 30 | 93242 | Laton | 78 | B | 3 (1 health) |
| 31 | 93550 | Palmdale | 78 | B | 1 |
| 32 | 93551 | Palmdale | 78 | B | 1 |
| 33 | 93555 | Ridgecrest | 78 | B | 0 |
| 34 | 93664 | Shaver Lake | 78 | B | 0 |
| 35 | 93230 | Hanford | 77 | B | 11 (3 health) |
| 36 | 93241 | Lamont | 77 | B | 2 |
| 37 | 93232 | Hanford | 76 | B | 11 (3 health) |
| 38 | 93263 | Shafter | 75 | B | 4 |
| 39 | 93561 | Tehachapi | 75 | B | 5 (2 health) |
| 40 | 93596 | Boron | 75 | B | 0 |
| 41 | 93622 | Firebaugh | 75 | B | 10 (2 health) |
| 42 | 93640 | Mendota | 75 | B | 0 |
| 43 | 93650 | Fresno | 75 | B | 7 (2 health) |
| 44 | 93660 | San Joaquin | 75 | B | 0 |
| 45 | 93701 | Fresno | 75 | B | 7 (2 health) |
| 46 | 93702 | Fresno | 75 | B | 7 (2 health) |
| 47 | 93703 | Fresno | 75 | B | 7 (2 health) |
| 48 | 93706 | Fresno | 75 | B | 7 (2 health) |
| 49 | 93721 | Fresno | 75 | B | 7 (2 health) |
| 50 | 93722 | Fresno | 75 | B | 7 (2 health) |
Overview
California's 20th District serving an estimated 47,378,669 residents encompasses 236 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (65/100).
1472 EPA violations have been recorded across this district's water systems. 951 are health-based violations. About 53% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Stage 2 DBP Rule — 312 violations
- Total Trihalomethanes (TTHM) — 238 violations
- Haloacetic Acids (HAA5) — 188 violations
- Combined Radium — 185 violations
- Contaminant 2414 — 177 violations
Housing Context
Homes in this district were built on average around 1977 (~49 years old). Older homes may have lead pipes or solder — consider a water filter if your home predates 1986.
Lead Alert: 6 ZIP codes 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 236 ZIP codes in California's 20th District.