CONGRESSIONAL DISTRICT CO

Colorado - 4th District

119th Congress · 131 ZIP codes · Avg score 54/100 · Grade D · Updated N/A

Data: EPA SDWIS / Census 119th Congress Last verified: N/A

ZipCheckup's versioned Home Safety Profile covers 131 ZIP codes in Colorado's 4th District: the measured model 4.0.0 average is Grade D (54/100). 505 EPA violations on record, 47 health-based.

D
District Grade
54
Avg Safety Score
131
ZIP Codes
505
Total Violations
47
Health Violations
54
Water Systems
Bennett
Best ZIP: 80102 (67/100)
Windsor
Lowest ZIP: 80550 (31/100)

Top Contaminants

E. coli (68) Lead and Copper Rule (43) Haloacetic Acids (HAA5) (42) Total Trihalomethanes (TTHM) (40) Stage 1 DBP Rule (35)

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 80102 Bennett 67 C 0
2 80126 Littleton 67 C 0
3 80129 Littleton 67 C 0
4 80130 Littleton 67 C 0
5 81052 Lamar 67 C 0
6 80104 Castle Rock 64 C 9
7 80125 Littleton 64 C 28
8 80109 Castle Rock 63 C 9
9 80116 Franktown 61 C 17
10 80549 Wellington 57 C 25 (2 health)
11 80642 Hudson 57 C 3
12 80610 Ault 56 C 8
13 80650 Pierce 56 C 8
14 80612 Carr 52 D 17 (2 health)
15 80118 Larkspur 50 D 47 (4 health)
16 80615 Eaton 49 D 28 (1 health)
17 80124 Lone Tree 48 D 7
18 80138 Parker 44 D 19 (1 health)
19 80108 Castle Rock 41 D 26
20 80134 Parker 41 D 27
21 80538 Loveland 38 F 35 (4 health)
22 80537 Loveland 33 F 71 (30 health)
23 80550 Windsor 31 F 28 (1 health)
24 80041 Aurora N/A N/A N/A
25 80044 Aurora N/A N/A N/A
26 80046 Aurora N/A N/A N/A
27 80047 Aurora N/A N/A N/A
28 80101 Agate N/A N/A N/A
29 80103 Byers N/A N/A N/A
30 80105 Deer Trail N/A N/A N/A
31 80107 Elizabeth N/A N/A 9 (1 health)
32 80117 Kiowa N/A N/A 0
33 80131 Louviers N/A N/A N/A
34 80135 Sedalia N/A N/A 45
35 80136 Strasburg N/A N/A N/A
36 80163 Littleton N/A N/A N/A
37 80539 Loveland N/A N/A N/A
38 80546 Severance N/A N/A N/A
39 80551 Windsor N/A N/A N/A
40 80611 Briggsdale N/A N/A N/A
41 80622 Galeton N/A N/A N/A
42 80643 Keenesburg N/A N/A N/A
43 80648 Nunn N/A N/A N/A
44 80649 Orchard N/A N/A N/A
45 80652 Roggen N/A N/A N/A
46 80653 Weldona N/A N/A N/A
47 80654 Wiggins N/A N/A N/A
48 80701 Fort Morgan N/A N/A 6
49 80705 Log Lane Village N/A N/A N/A
50 80720 Akron N/A N/A N/A

Overview

Colorado's 4th District encompasses 131 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is D (54/100).

505 EPA violations have been recorded across this district's water systems. 47 are health-based violations. About 82% of the 34 ZIP records with a reported violation count have at least one violation.

Top Contaminants

The most frequently cited water quality issues in this district:

  • E. coli - 68 violations
  • Lead and Copper Rule - 43 violations
  • Haloacetic Acids (HAA5) - 42 violations
  • Total Trihalomethanes (TTHM) - 40 violations
  • Stage 1 DBP Rule - 35 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.

Data Sources

Updated daily. Data covers 131 ZIP codes in Colorado's 4th District.

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How to cite this page

APA ZipCheckup. (2026). Colorado 4th District: 505 EPA Violations - D. https://zipcheckup.com/congressional/co-4/
BibTeX 
@misc{zipcheckup-congressional-co-4,
  author = {{ZipCheckup}},
  title  = {{Colorado 4th District: 505 EPA Violations - D}},
  year   = {2026},
  url    = {https://zipcheckup.com/congressional/co-4/}
}

Page version: August 2026.

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