California — 13th District
119th Congress · 84 ZIP codes · Avg score 70/100 · Grade B · Updated 2026-06-03
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-06-03
Top Contaminants
ZIP Codes in This District
84 ZIP codes tracked in California's 13th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 95324 | Hilmar | 95 | A | 0 |
| 2 | 95386 | Waterford | 95 | A | 0 |
| 3 | 95301 | Atwater | 90 | A | 0 |
| 4 | 95363 | Patterson | 90 | A | 0 |
| 5 | 95323 | Hickman | 88 | A | 0 |
| 6 | 95328 | Keyes | 88 | A | 0 |
| 7 | 95343 | Merced | 88 | A | 5 (1 health) |
| 8 | 95344 | Merced | 88 | A | 5 (1 health) |
| 9 | 95316 | Denair | 87 | A | 0 |
| 10 | 95315 | Delhi | 86 | A | 1 |
| 11 | 95334 | Livingston | 84 | B | 5 (3 health) |
| 12 | 95322 | Gustine | 83 | B | 2 (1 health) |
| 13 | 95350 | Modesto | 83 | B | 0 |
| 14 | 95352 | Modesto | 83 | B | 0 |
| 15 | 95353 | Modesto | 83 | B | 0 |
| 16 | 95355 | Modesto | 83 | B | 0 |
| 17 | 95356 | Modesto | 83 | B | 0 |
| 18 | 95357 | Modesto | 83 | B | 0 |
| 19 | 95397 | Modesto | 83 | B | 0 |
| 20 | 93610 | Chowchilla | 81 | B | 0 |
| 21 | 95001 | Aptos | 81 | B | 0 |
| 22 | 95338 | Mariposa | 81 | B | 1 |
| 23 | 92263 | Palm Springs | 79 | B | 4 (1 health) |
| 24 | 93636 | Madera | 79 | B | 2 (1 health) |
| 25 | 93638 | Madera | 79 | B | 2 (1 health) |
| 26 | 95067 | Scotts Valley | 79 | B | 8 (1 health) |
| 27 | 95303 | Ballico | 79 | B | 2 (2 health) |
| 28 | 92292 | Palm Springs | 78 | B | 4 (1 health) |
| 29 | 93639 | Madera | 78 | B | 2 (1 health) |
| 30 | 95351 | Modesto | 78 | B | 0 |
| 31 | 95354 | Modesto | 78 | B | 0 |
| 32 | 95358 | Modesto | 78 | B | 0 |
| 33 | 95019 | Freedom | 76 | B | 8 |
| 34 | 95340 | Merced | 76 | B | 5 (1 health) |
| 35 | 95341 | Merced | 76 | B | 5 (1 health) |
| 36 | 95348 | Merced | 76 | B | 5 (1 health) |
| 37 | 95360 | Newman | 75 | B | 5 (2 health) |
| 38 | 93637 | Madera | 74 | B | 2 (1 health) |
| 39 | 95066 | Scotts Valley | 74 | B | 8 (1 health) |
| 40 | 95313 | Crows Landing | 74 | B | 6 (2 health) |
| 41 | 95648 | Lincoln | 74 | B | 2 (2 health) |
| 42 | 95073 | Soquel | 73 | B | 0 |
| 43 | 95365 | Planada | 73 | B | 2 (1 health) |
| 44 | 95387 | Westley | 73 | B | 0 |
| 45 | 95326 | Hughson | 70 | B | 62 (61 health) |
| 46 | 92262 | Palm Springs | 69 | C | 4 (1 health) |
| 47 | 92264 | Palm Springs | 69 | C | 4 (1 health) |
| 48 | 95006 | Boulder Creek | 69 | C | 5 (1 health) |
| 49 | 95041 | Mount Hermon | 67 | C | 5 (1 health) |
| 50 | 95369 | Snelling | 67 | C | 0 |
Overview
California's 13th District serving an estimated 4,875,730 residents encompasses 84 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (70/100).
440 EPA violations have been recorded across this district's water systems. 311 are health-based violations. About 46% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Barium — 111 violations
- Stage 2 DBP Rule — 67 violations
- Haloacetic Acids (HAA5) — 37 violations
- Nickel — 33 violations
- Total Trihalomethanes (TTHM) — 29 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.
Lead Alert: 1 ZIP code 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 84 ZIP codes in California's 13th District.