Colorado — 1st District
119th Congress · 131 ZIP codes · Avg score 60/100 · 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 Colorado's 1st District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 80021 | Broomfield | 70 | B | 0 |
| 2 | 80022 | Commerce City | 70 | B | 0 |
| 3 | 80023 | Broomfield | 70 | B | 0 |
| 4 | 80121 | Littleton | 70 | B | 0 |
| 5 | 80125 | Littleton | 70 | B | 0 |
| 6 | 80126 | Littleton | 70 | B | 0 |
| 7 | 80127 | Littleton | 70 | B | 0 |
| 8 | 80128 | Littleton | 70 | B | 0 |
| 9 | 80129 | Littleton | 70 | B | 0 |
| 10 | 80130 | Littleton | 70 | B | 0 |
| 11 | 80640 | Henderson | 70 | B | 0 |
| 12 | 80031 | Westminster | 68 | C | 67 (2 health) |
| 13 | 80642 | Hudson | 68 | C | 12 (2 health) |
| 14 | 80037 | Commerce City | 66 | C | 0 |
| 15 | 80038 | Broomfield | 66 | C | 0 |
| 16 | 80160 | Littleton | 66 | C | 0 |
| 17 | 80161 | Littleton | 66 | C | 0 |
| 18 | 80162 | Littleton | 66 | C | 0 |
| 19 | 80163 | Littleton | 66 | C | 0 |
| 20 | 80165 | Littleton | 66 | C | 0 |
| 21 | 80166 | Littleton | 66 | C | 0 |
| 22 | 80241 | Thornton | 66 | C | 8 |
| 23 | 80614 | Eastlake | 66 | C | 0 |
| 24 | 80020 | Broomfield | 65 | C | 0 |
| 25 | 80120 | Littleton | 65 | C | 0 |
| 26 | 80122 | Littleton | 65 | C | 0 |
| 27 | 80123 | Littleton | 65 | C | 0 |
| 28 | 80643 | Keenesburg | 65 | C | 2 |
| 29 | 80035 | Westminster | 64 | C | 67 (2 health) |
| 30 | 80036 | Westminster | 64 | C | 67 (2 health) |
| 31 | 80137 | Watkins | 64 | C | 12 |
| 32 | 80030 | Westminster | 63 | C | 67 (2 health) |
| 33 | 80136 | Strasburg | 63 | C | 27 (4 health) |
| 34 | 80201 | Denver | 62 | C | 10 |
| 35 | 80202 | Denver | 62 | C | 10 |
| 36 | 80203 | Denver | 62 | C | 10 |
| 37 | 80205 | Denver | 62 | C | 10 |
| 38 | 80206 | Denver | 62 | C | 10 |
| 39 | 80207 | Denver | 62 | C | 10 |
| 40 | 80211 | Denver | 62 | C | 10 |
| 41 | 80212 | Denver | 62 | C | 10 |
| 42 | 80217 | Denver | 62 | C | 10 |
| 43 | 80218 | Denver | 62 | C | 10 |
| 44 | 80227 | Denver | 62 | C | 10 |
| 45 | 80228 | Denver | 62 | C | 10 |
| 46 | 80231 | Denver | 62 | C | 10 |
| 47 | 80232 | Denver | 62 | C | 10 |
| 48 | 80233 | Denver | 62 | C | 10 |
| 49 | 80234 | Denver | 62 | C | 10 |
| 50 | 80236 | Denver | 62 | C | 10 |
Overview
Colorado's 1st District serving an estimated 108,268,087 residents encompasses 131 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (60/100).
1328 EPA violations have been recorded across this district's water systems. 32 are health-based violations. About 79% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Fecal Coliform — 487 violations
- Combined Radium — 207 violations
- Stage 1 DBP Rule — 74 violations
- Gross Alpha — 72 violations
- Gross Beta — 68 violations
Housing Context
Homes in this district were built on average around 1982 (~44 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 131 ZIP codes in Colorado's 1st District.