California — 24th District
119th Congress · 75 ZIP codes · Avg score 66/100 · Grade C · Updated 2026-07-19
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-19
ZipCheckup tracks water safety for 75 ZIP codes in California's 24th District: the district earns a grade C (66/100). 230 EPA violations on record, 95 health-based.
Top Contaminants
ZIP Codes in This District
75 ZIP codes tracked in California's 24th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 93412 | Los Osos | 83 | B | 0 |
| 2 | 93403 | San Luis Obispo | 82 | B | 2 (1 health) |
| 3 | 93406 | San Luis Obispo | 82 | B | 2 (1 health) |
| 4 | 93407 | San Luis Obispo | 82 | B | 2 (1 health) |
| 5 | 93408 | San Luis Obispo | 82 | B | 2 (1 health) |
| 6 | 93409 | San Luis Obispo | 82 | B | 2 (1 health) |
| 7 | 93410 | San Luis Obispo | 82 | B | 2 (1 health) |
| 8 | 93424 | Avila Beach | 82 | B | 1 (1 health) |
| 9 | 93443 | Morro Bay | 82 | B | 1 (1 health) |
| 10 | 93421 | Arroyo Grande | 81 | B | 2 |
| 11 | 93402 | Los Osos | 78 | B | 0 |
| 12 | 93423 | Atascadero | 78 | B | 3 |
| 13 | 93430 | Cayucos | 78 | B | 0 |
| 14 | 93444 | Nipomo | 78 | B | 0 |
| 15 | 93420 | Arroyo Grande | 76 | B | 2 |
| 16 | 93448 | Pismo Beach | 76 | B | 4 (3 health) |
| 17 | 93401 | San Luis Obispo | 72 | B | 2 (1 health) |
| 18 | 93405 | San Luis Obispo | 72 | B | 2 (1 health) |
| 19 | 93442 | Morro Bay | 72 | B | 1 (1 health) |
| 20 | 93449 | Pismo Beach | 72 | B | 4 (3 health) |
| 21 | 93475 | Oceano | 72 | B | 1 |
| 22 | 93014 | Carpinteria | 70 | B | 0 |
| 23 | 93436 | Lompoc | 70 | B | 0 |
| 24 | 93440 | Los Alamos | 70 | B | 0 |
| 25 | 93445 | Oceano | 70 | B | 1 |
| 26 | 93254 | New Cuyama | 69 | C | 2 |
| 27 | 93102 | Santa Barbara | 68 | C | 1 |
| 28 | 93111 | Santa Barbara | 68 | C | 1 |
| 29 | 93437 | Lompoc | 66 | C | 0 |
| 30 | 93438 | Lompoc | 66 | C | 0 |
| 31 | 93455 | Santa Maria | 66 | C | 5 |
| 32 | 93458 | Santa Maria | 66 | C | 5 |
| 33 | 93441 | Los Olivos | 65 | C | 0 |
| 34 | 93460 | Santa Ynez | 65 | C | 0 |
| 35 | 93106 | Santa Barbara | 64 | C | 1 |
| 36 | 93107 | Santa Barbara | 64 | C | 1 |
| 37 | 93120 | Santa Barbara | 64 | C | 1 |
| 38 | 93121 | Santa Barbara | 64 | C | 1 |
| 39 | 93130 | Santa Barbara | 64 | C | 1 |
| 40 | 93140 | Santa Barbara | 64 | C | 1 |
| 41 | 93150 | Santa Barbara | 64 | C | 1 |
| 42 | 93160 | Santa Barbara | 64 | C | 1 |
| 43 | 93190 | Santa Barbara | 64 | C | 1 |
| 44 | 93004 | Ventura | 63 | C | 11 (4 health) |
| 45 | 93109 | Santa Barbara | 63 | C | 1 |
| 46 | 93110 | Santa Barbara | 63 | C | 1 |
| 47 | 93427 | Buellton | 62 | C | 3 (2 health) |
| 48 | 93434 | Guadalupe | 62 | C | 0 |
| 49 | 93456 | Santa Maria | 62 | C | 5 |
| 50 | 93457 | Santa Maria | 62 | C | 5 |
Overview
California's 24th District encompasses 75 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (66/100).
230 EPA violations have been recorded across this district's water systems. 95 are health-based violations. About 80% 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 - 67 violations
- Barium - 39 violations
- E. coli - 26 violations
- Lead - 21 violations
- Stage 2 DBP Rule - 20 violations
Housing Context
Homes in this district were built on average around 1974 (~52 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 75 ZIP codes in California's 24th District.