Connecticut — 4th District
119th Congress · 72 ZIP codes · Avg score 55/100 · Grade C · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 72 ZIP codes in Connecticut's 4th District: the district earns a grade C (55/100). 840 EPA violations on record, 35 health-based.
Top Contaminants
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 | 69 | C | 2 (1 health) |
| 2 | 06901 | Stamford | 69 | C | 40 (1 health) |
| 3 | 06904 | Stamford | 69 | C | 40 (1 health) |
| 4 | 06836 | Greenwich | 66 | C | 0 |
| 5 | 06468 | Monroe | 65 | C | 0 |
| 6 | 06814 | Danbury | 65 | C | 9 (1 health) |
| 7 | 06816 | Danbury | 65 | C | 9 (1 health) |
| 8 | 06857 | Norwalk | 65 | C | 2 (1 health) |
| 9 | 06858 | Norwalk | 65 | C | 2 (1 health) |
| 10 | 06859 | Norwalk | 65 | C | 2 (1 health) |
| 11 | 06860 | Norwalk | 65 | C | 2 (1 health) |
| 12 | 06910 | Stamford | 65 | C | 40 (1 health) |
| 13 | 06911 | Stamford | 65 | C | 40 (1 health) |
| 14 | 06912 | Stamford | 65 | C | 40 (1 health) |
| 15 | 06913 | Stamford | 65 | C | 40 (1 health) |
| 16 | 06914 | Stamford | 65 | C | 40 (1 health) |
| 17 | 06920 | Stamford | 65 | C | 40 (1 health) |
| 18 | 06921 | Stamford | 65 | C | 40 (1 health) |
| 19 | 06922 | Stamford | 65 | C | 40 (1 health) |
| 20 | 06925 | Stamford | 65 | C | 40 (1 health) |
| 21 | 06926 | Stamford | 65 | C | 40 (1 health) |
| 22 | 06927 | Stamford | 65 | C | 40 (1 health) |
| 23 | 06928 | Stamford | 65 | C | 40 (1 health) |
| 24 | 06856 | Norwalk | 64 | C | 2 (1 health) |
| 25 | 06879 | Ridgefield | 64 | C | 4 |
| 26 | 06906 | Stamford | 64 | C | 40 (1 health) |
| 27 | 06907 | Stamford | 64 | C | 40 (1 health) |
| 28 | 06829 | Georgetown | 63 | C | 0 |
| 29 | 06828 | Fairfield | 61 | C | 8 (1 health) |
| 30 | 06478 | Oxford | 60 | C | 1 |
| 31 | 06883 | Weston | 60 | C | 1 |
| 32 | 06850 | Norwalk | 59 | C | 2 (1 health) |
| 33 | 06851 | Norwalk | 59 | C | 2 (1 health) |
| 34 | 06897 | Wilton | 59 | C | 2 |
| 35 | 06903 | Stamford | 59 | C | 40 (1 health) |
| 36 | 06905 | Stamford | 59 | C | 40 (1 health) |
| 37 | 06877 | Ridgefield | 58 | C | 4 |
| 38 | 06611 | Trumbull | 57 | C | 4 |
| 39 | 06830 | Greenwich | 55 | C | 0 |
| 40 | 06831 | Greenwich | 55 | C | 0 |
| 41 | 06853 | Norwalk | 54 | D | 2 (1 health) |
| 42 | 06854 | Norwalk | 54 | D | 2 (1 health) |
| 43 | 06855 | Norwalk | 54 | D | 2 (1 health) |
| 44 | 06902 | Stamford | 54 | D | 40 (1 health) |
| 45 | 06601 | Bridgeport | 53 | D | 0 |
| 46 | 06881 | Westport | 53 | D | 0 |
| 47 | 06889 | Westport | 53 | D | 0 |
| 48 | 06825 | Fairfield | 51 | D | 8 (1 health) |
| 49 | 06840 | New Canaan | 50 | D | 0 |
| 50 | 06824 | Fairfield | 46 | D | 8 (1 health) |
Overview
Connecticut's 4th District encompasses 72 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (55/100).
840 EPA violations have been recorded across this district's water systems. 35 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 - 191 violations
- Stage 1 DBP Rule - 121 violations
- Surface Water Treatment Rule - 97 violations
- Lead and Copper Rule - 97 violations
- Contaminant 1017 - 76 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
- 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 72 ZIP codes in Connecticut's 4th District.