Indiana — 1st District
119th Congress · 36 ZIP codes · Avg score 64/100 · Grade C · Updated 2026-06-03
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-06-03
Top Contaminants
ZIP Codes in This District
36 ZIP codes tracked in Indiana's 1st District.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 46347 | Kouts | 83 | B | 0 |
| 2 | 46304 | Chesterton | 78 | B | 1 |
| 3 | 46411 | Merrillville | 78 | B | 14 (1 health) |
| 4 | 46342 | Hobart | 76 | B | 1 |
| 5 | 46341 | Hebron | 75 | B | 3 |
| 6 | 46376 | Schneider | 74 | B | 4 (1 health) |
| 7 | 46394 | Whiting | 73 | B | 0 |
| 8 | 46356 | Lowell | 72 | B | 7 (3 health) |
| 9 | 46312 | East Chicago | 70 | B | 7 |
| 10 | 46327 | Hammond | 69 | C | 17 |
| 11 | 46410 | Merrillville | 69 | C | 14 (1 health) |
| 12 | 46322 | Highland | 68 | C | 0 |
| 13 | 46311 | Dyer | 66 | C | 0 |
| 14 | 46321 | Munster | 65 | C | 3 |
| 15 | 46325 | Hammond | 65 | C | 17 |
| 16 | 46320 | Hammond | 64 | C | 17 |
| 17 | 46375 | Schererville | 64 | C | 11 |
| 18 | 46373 | Saint John | 63 | C | 0 |
| 19 | 46393 | Wheeler | 63 | C | 0 |
| 20 | 46403 | Gary | 63 | C | 0 |
| 21 | 46404 | Gary | 63 | C | 0 |
| 22 | 46406 | Gary | 63 | C | 0 |
| 23 | 46407 | Gary | 63 | C | 0 |
| 24 | 46319 | Griffith | 61 | C | 5 |
| 25 | 46324 | Hammond | 59 | C | 17 |
| 26 | 46303 | Cedar Lake | 58 | C | 29 (1 health) |
| 27 | 46368 | Portage | 55 | C | 0 |
| 28 | 46409 | Gary | 55 | C | 0 |
| 29 | 46323 | Hammond | 54 | D | 17 |
| 30 | 46302 | Boone Grove | 53 | D | 0 |
| 31 | 46355 | Leroy | 53 | D | 0 |
| 32 | 46380 | Tefft | 53 | D | 0 |
| 33 | 46401 | Gary | 53 | D | 0 |
| 34 | 46402 | Gary | 53 | D | 0 |
| 35 | 46405 | Lake Station | 50 | D | 0 |
| 36 | 46408 | Gary | 50 | D | 0 |
Overview
Indiana's 1st District serving an estimated 903,404 residents encompasses 36 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (64/100).
184 EPA violations have been recorded across this district's water systems. 7 are health-based violations. About 47% 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 — 31 violations
- Surface Water Treatment Rule — 24 violations
- Contaminant 2035 — 15 violations
- Contaminant 2037 — 15 violations
- Atrazine — 15 violations
Housing Context
Homes in this district were built on average around 1960 (~66 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 36 ZIP codes in Indiana's 1st District.