Connecticut — 3rd District
119th Congress · 61 ZIP codes · Avg score 58/100 · Grade C · Updated 2026-07-19
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-19
ZipCheckup tracks water safety for 61 ZIP codes in Connecticut's 3rd District: the district earns a grade C (58/100). 293 EPA violations on record, 25 health-based.
Top Contaminants
ZIP Codes in This District
61 ZIP codes tracked in Connecticut's 3rd District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 06501 | New Haven | 70 | B | 0 |
| 2 | 06503 | New Haven | 70 | B | 0 |
| 3 | 06505 | New Haven | 70 | B | 0 |
| 4 | 06506 | New Haven | 70 | B | 0 |
| 5 | 06507 | New Haven | 70 | B | 0 |
| 6 | 06510 | New Haven | 70 | B | 0 |
| 7 | 06531 | New Haven | 70 | B | 0 |
| 8 | 06540 | New Haven | 70 | B | 0 |
| 9 | 06455 | Middlefield | 66 | C | 19 (1 health) |
| 10 | 06502 | New Haven | 66 | C | 0 |
| 11 | 06504 | New Haven | 66 | C | 0 |
| 12 | 06508 | New Haven | 66 | C | 0 |
| 13 | 06509 | New Haven | 66 | C | 0 |
| 14 | 06520 | New Haven | 66 | C | 0 |
| 15 | 06521 | New Haven | 66 | C | 0 |
| 16 | 06530 | New Haven | 66 | C | 0 |
| 17 | 06532 | New Haven | 66 | C | 0 |
| 18 | 06533 | New Haven | 66 | C | 0 |
| 19 | 06534 | New Haven | 66 | C | 0 |
| 20 | 06535 | New Haven | 66 | C | 0 |
| 21 | 06536 | New Haven | 66 | C | 0 |
| 22 | 06537 | New Haven | 66 | C | 0 |
| 23 | 06538 | New Haven | 66 | C | 0 |
| 24 | 06712 | Prospect | 66 | C | 7 (1 health) |
| 25 | 06483 | Seymour | 65 | C | 0 |
| 26 | 06511 | New Haven | 65 | C | 0 |
| 27 | 06519 | New Haven | 65 | C | 0 |
| 28 | 06706 | Waterbury | 65 | C | 22 (2 health) |
| 29 | 06770 | Naugatuck | 65 | C | 0 |
| 30 | 06459 | Middletown | 61 | C | 14 (1 health) |
| 31 | 06422 | Durham | 60 | C | 34 (4 health) |
| 32 | 06493 | Wallingford | 60 | C | 24 (2 health) |
| 33 | 06494 | Wallingford | 60 | C | 24 (2 health) |
| 34 | 06495 | Wallingford | 60 | C | 24 (2 health) |
| 35 | 06513 | New Haven | 60 | C | 0 |
| 36 | 06515 | New Haven | 60 | C | 0 |
| 37 | 06457 | Middletown | 56 | C | 14 (1 health) |
| 38 | 06405 | Branford | 55 | C | 1 |
| 39 | 06437 | Guilford | 55 | C | 1 |
| 40 | 06471 | North Branford | 55 | C | 21 (2 health) |
| 41 | 06484 | Shelton | 55 | C | 19 (2 health) |
| 42 | 06492 | Wallingford | 55 | C | 24 (2 health) |
| 43 | 06481 | Rockfall | 54 | D | 7 (1 health) |
| 44 | 06401 | Ansonia | 53 | D | 0 |
| 45 | 06403 | Beacon Falls | 53 | D | 0 |
| 46 | 06524 | Bethany | 53 | D | 18 |
| 47 | 06516 | West Haven | 51 | D | 3 (1 health) |
| 48 | 06408 | Cheshire | 50 | D | 16 (1 health) |
| 49 | 06461 | Milford | 50 | D | 0 |
| 50 | 06418 | Derby | 45 | D | 0 |
Overview
Connecticut's 3rd District encompasses 61 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (58/100).
293 EPA violations have been recorded across this district's water systems. 25 are health-based violations. About 31% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Stage 1 DBP Rule - 89 violations
- Surface Water Treatment Rule - 69 violations
- Lead and Copper Rule - 34 violations
- Stage 2 DBP Rule - 30 violations
- Revised Total Coliform Rule - 15 violations
Housing Context
Homes in this district were built on average around 1963 (~63 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 61 ZIP codes in Connecticut's 3rd District.