Iowa — 4th District
119th Congress · 357 ZIP codes · Avg score 61/100 · Grade C · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 357 ZIP codes in Iowa's 4th District: the district earns a grade C (61/100). 449 EPA violations on record, 73 health-based.
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 | 50421 | Belmond | 70 | B | 1 |
| 8 | 50475 | Sheffield | 70 | B | 0 |
| 9 | 50531 | Dolliver | 70 | B | 0 |
| 10 | 50536 | Emmetsburg | 70 | B | 0 |
| 11 | 50542 | Goldfield | 70 | B | 0 |
| 12 | 50569 | Otho | 70 | B | 0 |
| 13 | 50588 | Storm Lake | 70 | B | 0 |
| 14 | 51003 | Alton | 70 | B | 0 |
| 15 | 51004 | Anthon | 70 | B | 0 |
| 16 | 51023 | Hawarden | 70 | B | 0 |
| 17 | 51028 | Kingsley | 70 | B | 0 |
| 18 | 51031 | Le Mars | 70 | B | 0 |
| 19 | 51038 | Merrill | 70 | B | 1 |
| 20 | 51040 | Onawa | 70 | B | 0 |
| 21 | 51041 | Orange City | 70 | B | 0 |
| 22 | 51054 | Sergeant Bluff | 70 | B | 0 |
| 23 | 51062 | Westfield | 70 | B | 0 |
| 24 | 51063 | Whiting | 70 | B | 0 |
| 25 | 51101 | Sioux City | 70 | B | 1 |
| 26 | 51102 | Sioux City | 70 | B | 1 |
| 27 | 51105 | Sioux City | 70 | B | 1 |
| 28 | 51108 | Sioux City | 70 | B | 1 |
| 29 | 51201 | Sheldon | 70 | B | 0 |
| 30 | 51234 | Boyden | 70 | B | 0 |
| 31 | 51237 | George | 70 | B | 0 |
| 32 | 51242 | Lester | 70 | B | 0 |
| 33 | 51250 | Sioux Center | 70 | B | 1 |
| 34 | 51338 | Everly | 70 | B | 1 |
| 35 | 51346 | Hartley | 70 | B | 0 |
| 36 | 51351 | Milford | 70 | B | 0 |
| 37 | 51355 | Okoboji | 70 | B | 0 |
| 38 | 51358 | Ruthven | 70 | B | 0 |
| 39 | 51445 | Ida Grove | 70 | B | 0 |
| 40 | 51448 | Kiron | 70 | B | 1 |
| 41 | 51455 | Manning | 70 | B | 0 |
| 42 | 51458 | Odebolt | 70 | B | 0 |
| 43 | 51465 | Vail | 70 | B | 1 |
| 44 | 51523 | Blencoe | 70 | B | 0 |
| 45 | 51564 | Pisgah | 70 | B | 0 |
| 46 | 51639 | Farragut | 70 | B | 0 |
| 47 | 50156 | Madrid | 69 | C | 2 (1 health) |
| 48 | 50453 | Leland | 69 | C | 4 (1 health) |
| 49 | 50511 | Algona | 69 | C | 2 |
| 50 | 51030 | Lawton | 69 | C | 2 |
Overview
Iowa's 4th District encompasses 357 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (61/100).
449 EPA violations have been recorded across this district's water systems. 73 are health-based violations. About 21% 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 - 76 violations
- Stage 1 DBP Rule - 59 violations
- Surface Water Treatment Rule - 50 violations
- Copper - 44 violations
- Lead - 42 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.
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.