Iowa — 4th District
119th Congress · 357 ZIP codes · Avg score 58/100 · 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 Iowa's 4th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 50046 | Cambridge | 70 | B | 0 |
| 2 | 50055 | Collins | 70 | B | 0 |
| 3 | 50058 | Coon Rapids | 70 | B | 0 |
| 4 | 50076 | Exira | 70 | B | 1 |
| 5 | 50105 | Gilbert | 70 | B | 1 |
| 6 | 50236 | Roland | 70 | B | 0 |
| 7 | 50475 | Sheffield | 70 | B | 0 |
| 8 | 50542 | Goldfield | 70 | B | 0 |
| 9 | 50569 | Otho | 70 | B | 0 |
| 10 | 50588 | Storm Lake | 70 | B | 0 |
| 11 | 51346 | Hartley | 70 | B | 0 |
| 12 | 51351 | Milford | 70 | B | 0 |
| 13 | 51355 | Okoboji | 70 | B | 0 |
| 14 | 51358 | Ruthven | 70 | B | 0 |
| 15 | 51401 | Carroll | 70 | B | 0 |
| 16 | 51445 | Ida Grove | 70 | B | 0 |
| 17 | 51455 | Manning | 70 | B | 0 |
| 18 | 51458 | Odebolt | 70 | B | 0 |
| 19 | 51523 | Blencoe | 70 | B | 0 |
| 20 | 51564 | Pisgah | 70 | B | 0 |
| 21 | 51639 | Farragut | 70 | B | 0 |
| 22 | 50156 | Madrid | 69 | C | 2 (1 health) |
| 23 | 50536 | Emmetsburg | 69 | C | 0 |
| 24 | 51448 | Kiron | 69 | C | 3 |
| 25 | 51465 | Vail | 69 | C | 2 |
| 26 | 50248 | Story City | 68 | C | 2 |
| 27 | 51354 | Ocheyedan | 68 | C | 2 |
| 28 | 50453 | Leland | 67 | C | 9 (3 health) |
| 29 | 51441 | Deloit | 67 | C | 6 |
| 30 | 50034 | Blairsburg | 66 | C | 0 |
| 31 | 50051 | Clemons | 66 | C | 0 |
| 32 | 50071 | Dows | 66 | C | 0 |
| 33 | 50106 | Gilman | 66 | C | 0 |
| 34 | 50124 | Huxley | 66 | C | 0 |
| 35 | 50134 | Kelley | 66 | C | 0 |
| 36 | 50141 | Laurel | 66 | C | 0 |
| 37 | 50142 | Le Grand | 66 | C | 0 |
| 38 | 50212 | Ogden | 66 | C | 0 |
| 39 | 50223 | Pilot Mound | 66 | C | 0 |
| 40 | 50231 | Randall | 66 | C | 0 |
| 41 | 50234 | Rhodes | 66 | C | 0 |
| 42 | 50424 | Buffalo Center | 66 | C | 0 |
| 43 | 50438 | Garner | 66 | C | 0 |
| 44 | 50447 | Kanawha | 66 | C | 0 |
| 45 | 50450 | Lake Mills | 66 | C | 0 |
| 46 | 50452 | Latimer | 66 | C | 0 |
| 47 | 50465 | Rake | 66 | C | 0 |
| 48 | 50478 | Thompson | 66 | C | 0 |
| 49 | 50483 | Wesley | 66 | C | 0 |
| 50 | 50510 | Albert City | 66 | C | 0 |
Overview
Iowa's 4th District serving an estimated 2,042,571 residents encompasses 357 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (58/100).
1139 EPA violations have been recorded across this district's water systems. 232 are health-based violations. About 24% 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 — 147 violations
- Haloacetic Acids (HAA5) — 137 violations
- Copper — 133 violations
- Total Trihalomethanes (TTHM) — 131 violations
- Barium — 101 violations
Housing Context
Homes in this district were built on average around 1946 (~80 years old). Older homes may have lead pipes or solder — consider a water filter if your home predates 1986.
Lead Alert: 3 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 357 ZIP codes in Iowa's 4th District.