California — 13th District
119th Congress · 58 ZIP codes · Avg score 75/100 · Grade B · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 58 ZIP codes in California's 13th District: the district earns a grade B (75/100). 134 EPA violations on record, 73 health-based.
Top Contaminants
ZIP Codes in This District
58 ZIP codes tracked in California's 13th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 95378 | Tracy | 98 | A | 2 (1 health) |
| 2 | 95324 | Hilmar | 95 | A | 0 |
| 3 | 95377 | Tracy | 94 | A | 2 (1 health) |
| 4 | 95301 | Atwater | 90 | A | 0 |
| 5 | 95330 | Lathrop | 90 | A | 0 |
| 6 | 95351 | Modesto | 90 | A | 0 |
| 7 | 95358 | Modesto | 90 | A | 0 |
| 8 | 95363 | Patterson | 90 | A | 0 |
| 9 | 95334 | Livingston | 89 | A | 4 (2 health) |
| 10 | 95328 | Keyes | 88 | A | 0 |
| 11 | 95343 | Merced | 88 | A | 5 (1 health) |
| 12 | 95344 | Merced | 88 | A | 5 (1 health) |
| 13 | 95315 | Delhi | 86 | A | 1 |
| 14 | 95303 | Ballico | 85 | A | 1 (1 health) |
| 15 | 95322 | Gustine | 83 | B | 2 (1 health) |
| 16 | 95369 | Snelling | 83 | B | 0 |
| 17 | 93635 | Los Banos | 82 | B | 7 (4 health) |
| 18 | 93660 | San Joaquin | 80 | B | 0 |
| 19 | 93638 | Madera | 79 | B | 2 (1 health) |
| 20 | 93242 | Laton | 78 | B | 3 (1 health) |
| 21 | 93639 | Madera | 78 | B | 2 (1 health) |
| 22 | 95388 | Winton | 78 | B | 3 (2 health) |
| 23 | 93656 | Riverdale | 77 | B | 1 (1 health) |
| 24 | 93606 | Biola | 76 | B | 1 |
| 25 | 95340 | Merced | 76 | B | 5 (1 health) |
| 26 | 95341 | Merced | 76 | B | 5 (1 health) |
| 27 | 95348 | Merced | 76 | B | 5 (1 health) |
| 28 | 95360 | Newman | 76 | B | 2 (1 health) |
| 29 | 93622 | Firebaugh | 75 | B | 6 (2 health) |
| 30 | 93640 | Mendota | 75 | B | 0 |
| 31 | 93706 | Fresno | 75 | B | 5 (2 health) |
| 32 | 93637 | Madera | 74 | B | 2 (1 health) |
| 33 | 95313 | Crows Landing | 74 | B | 5 (2 health) |
| 34 | 95365 | Planada | 73 | B | 2 (1 health) |
| 35 | 95385 | Vernalis | 73 | B | 0 |
| 36 | 95387 | Westley | 73 | B | 0 |
| 37 | 93210 | Coalinga | 72 | B | 3 (3 health) |
| 38 | 93624 | Five Points | 72 | B | 0 |
| 39 | 95307 | Ceres | 71 | B | 7 (6 health) |
| 40 | 93630 | Kerman | 67 | C | 8 (1 health) |
| 41 | 93668 | Tranquillity | 67 | C | 3 (1 health) |
| 42 | 93609 | Caruthers | 66 | C | 5 (5 health) |
| 43 | 93661 | Santa Rita Park | 66 | C | 0 |
| 44 | 93665 | South Dos Palos | 66 | C | 0 |
| 45 | 95312 | Cressey | 66 | C | 0 |
| 46 | 95317 | El Nido | 66 | C | 0 |
| 47 | 95374 | Stevinson | 66 | C | 0 |
| 48 | 95381 | Turlock | 66 | C | 0 |
| 49 | 95380 | Turlock | 65 | C | 0 |
| 50 | 95333 | Le Grand | 62 | C | 9 (8 health) |
Overview
California's 13th District encompasses 58 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (75/100).
134 EPA violations have been recorded across this district's water systems. 73 are health-based violations. About 57% 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 - 51 violations
- Haloacetic Acids (HAA5) - 20 violations
- Barium - 17 violations
- Consumer Confidence Report Rule - 13 violations
- Stage 1 DBP Rule - 10 violations
Housing Context
Homes in this district were built on average around 1981 (~45 years old). Older homes may have lead pipes or solder - consider a water filter if your home predates 1986.
Lead Alert: 2 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 58 ZIP codes in California's 13th District.