Colorado — 4th District
119th Congress · 131 ZIP codes · Avg score 56/100 · Grade C · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 131 ZIP codes in Colorado's 4th District: the district earns a grade C (56/100). 738 EPA violations on record, 127 health-based.
Top Contaminants
ZIP Codes in This District
100 ZIP codes tracked in Colorado's 4th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 80125 | Littleton | 70 | B | 0 |
| 2 | 80126 | Littleton | 70 | B | 0 |
| 3 | 80129 | Littleton | 70 | B | 0 |
| 4 | 80130 | Littleton | 70 | B | 0 |
| 5 | 80650 | Pierce | 70 | B | 1 |
| 6 | 80117 | Kiowa | 69 | C | 3 |
| 7 | 80615 | Eaton | 69 | C | 8 (1 health) |
| 8 | 80653 | Weldona | 69 | C | 3 |
| 9 | 80726 | Crook | 69 | C | 3 |
| 10 | 80808 | Calhan | 69 | C | 7 (1 health) |
| 11 | 80832 | Ramah | 69 | C | 8 (1 health) |
| 12 | 80104 | Castle Rock | 68 | C | 4 |
| 13 | 80108 | Castle Rock | 68 | C | 4 |
| 14 | 80109 | Castle Rock | 68 | C | 4 |
| 15 | 80642 | Hudson | 68 | C | 12 (2 health) |
| 16 | 80701 | Fort Morgan | 68 | C | 1 |
| 17 | 80734 | Holyoke | 68 | C | 5 |
| 18 | 81076 | Sugar City | 68 | C | 5 |
| 19 | 80828 | Limon | 67 | C | 3 |
| 20 | 80103 | Byers | 66 | C | 1 |
| 21 | 80105 | Deer Trail | 66 | C | 1 |
| 22 | 80163 | Littleton | 66 | C | 0 |
| 23 | 80648 | Nunn | 66 | C | 0 |
| 24 | 80733 | Hillrose | 66 | C | 1 |
| 25 | 80742 | New Raymer | 66 | C | 1 |
| 26 | 80749 | Sedgwick | 66 | C | 1 |
| 27 | 80807 | Burlington | 66 | C | 0 |
| 28 | 80810 | Cheyenne Wells | 66 | C | 1 |
| 29 | 80835 | Simla | 66 | C | 0 |
| 30 | 81029 | Campo | 66 | C | 0 |
| 31 | 81036 | Eads | 66 | C | 1 |
| 32 | 81062 | Olney Springs | 66 | C | 1 |
| 33 | 80107 | Elizabeth | 65 | C | 3 |
| 34 | 80611 | Briggsdale | 65 | C | 2 |
| 35 | 80643 | Keenesburg | 65 | C | 2 |
| 36 | 80705 | Log Lane Village | 65 | C | 3 |
| 37 | 80720 | Akron | 65 | C | 5 (1 health) |
| 38 | 80728 | Fleming | 65 | C | 12 (1 health) |
| 39 | 80736 | Iliff | 65 | C | 3 |
| 40 | 80743 | Otis | 65 | C | 13 (1 health) |
| 41 | 80815 | Flagler | 65 | C | 2 |
| 42 | 80821 | Hugo | 65 | C | 8 (1 health) |
| 43 | 80836 | Stratton | 65 | C | 12 (1 health) |
| 44 | 81073 | Springfield | 65 | C | 3 (1 health) |
| 45 | 80101 | Agate | 64 | C | 17 (2 health) |
| 46 | 80102 | Bennett | 64 | C | 4 |
| 47 | 80135 | Sedalia | 64 | C | 13 (1 health) |
| 48 | 80138 | Parker | 64 | C | 7 |
| 49 | 80546 | Severance | 64 | C | 2 |
| 50 | 80610 | Ault | 64 | C | 4 |
Overview
Colorado's 4th District encompasses 131 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (56/100).
738 EPA violations have been recorded across this district's water systems. 127 are health-based violations. About 64% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Lead and Copper Rule - 189 violations
- Stage 1 DBP Rule - 91 violations
- Gross Beta - 86 violations
- Consumer Confidence Report Rule - 67 violations
- Surface Water Treatment Rule - 45 violations
Housing Context
Homes in this district were built on average around 1968 (~58 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 131 ZIP codes in Colorado's 4th District.