CONGRESSIONAL DISTRICT CT

Connecticut — 4th District

119th Congress · 72 ZIP codes · Avg score 55/100 · Grade C · Updated 2026-06-03

Data: EPA SDWIS / Census 119th Congress Last verified: 2026-06-03

C
District Grade
55
Avg Safety Score
72
ZIP Codes
3505
Total Violations
75
Health Violations
26
Water Systems
Norwalk
Best ZIP: 06852 (82/100)
Old Greenwich
Lowest ZIP: 06870 (35/100)

Top Contaminants

Consumer Confidence Report Rule (666) Stage 1 DBP Rule (262) Contaminant 1017 (247) Total Coliform (230) Total Trihalomethanes (TTHM) (213)

ZIP Codes in This District

72 ZIP codes tracked in Connecticut's 4th District. Showing top 50 by safety score.

# ZIP Code City Safety Score Grade Violations
1 06852 Norwalk 82 B 2 (1 health)
2 06857 Norwalk 82 B 2 (1 health)
3 06858 Norwalk 82 B 2 (1 health)
4 06859 Norwalk 82 B 2 (1 health)
5 06860 Norwalk 82 B 2 (1 health)
6 06856 Norwalk 77 B 2 (1 health)
7 06850 Norwalk 72 B 2 (1 health)
8 06851 Norwalk 72 B 2 (1 health)
9 06897 Wilton 71 B 4
10 06853 Norwalk 67 C 2 (1 health)
11 06854 Norwalk 67 C 2 (1 health)
12 06855 Norwalk 67 C 2 (1 health)
13 06836 Greenwich 66 C 0
14 06468 Monroe 65 C 0
15 06814 Danbury 64 C 467 (2 health)
16 06816 Danbury 64 C 467 (2 health)
17 06901 Stamford 64 C 131 (3 health)
18 06904 Stamford 64 C 131 (3 health)
19 06829 Georgetown 63 C 0
20 06879 Ridgefield 63 C 6
21 06828 Fairfield 61 C 11 (1 health)
22 06883 Weston 60 C 1
23 06478 Oxford 59 C 2
24 06906 Stamford 59 C 131 (3 health)
25 06907 Stamford 59 C 131 (3 health)
26 06910 Stamford 59 C 131 (3 health)
27 06911 Stamford 59 C 131 (3 health)
28 06912 Stamford 59 C 131 (3 health)
29 06913 Stamford 59 C 131 (3 health)
30 06914 Stamford 59 C 131 (3 health)
31 06920 Stamford 59 C 131 (3 health)
32 06921 Stamford 59 C 131 (3 health)
33 06922 Stamford 59 C 131 (3 health)
34 06925 Stamford 59 C 131 (3 health)
35 06926 Stamford 59 C 131 (3 health)
36 06927 Stamford 59 C 131 (3 health)
37 06928 Stamford 59 C 131 (3 health)
38 06877 Ridgefield 57 C 6
39 06611 Trumbull 55 C 8
40 06830 Greenwich 55 C 0
41 06831 Greenwich 55 C 0
42 06903 Stamford 54 D 131 (3 health)
43 06905 Stamford 54 D 131 (3 health)
44 06601 Bridgeport 53 D 0
45 06881 Westport 53 D 0
46 06889 Westport 53 D 0
47 06825 Fairfield 51 D 11 (1 health)
48 06840 New Canaan 50 D 0
49 06902 Stamford 49 D 131 (3 health)
50 06824 Fairfield 46 D 11 (1 health)

Overview

Connecticut's 4th District serving an estimated 1,101,746 residents encompasses 72 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (55/100).

3505 EPA violations have been recorded across this district's water systems. 75 are health-based violations. About 57% 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 — 666 violations
  • Stage 1 DBP Rule — 262 violations
  • Contaminant 1017 — 247 violations
  • Total Coliform — 230 violations
  • Total Trihalomethanes (TTHM) — 213 violations

Housing Context

Homes in this district were built on average around 1962 (~64 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 72 ZIP codes in Connecticut's 4th District.

← Back to Connecticut overview

Violations found — check filter options Free tool — no phone call required.