Out of 282 ZIP codes with data in Connecticut, these are the highest-ranked areas for gas risk score. See also: National ZIP Codes with Worst CO & Gas Safety Risk | All Connecticut Rankings
| Statistic | Value |
|---|---|
| ZIP codes ranked | 282 |
| Highest value | 6/100 |
| Median value | 1/100 |
| State | Connecticut |
Top 100 Worst ZIP Codes
| Rank | ZIP Code | City | State | Gas Risk Score | Safety Score |
|---|---|---|---|---|---|
| 1 | 06401 | Ansonia | CT | 6/100 | 50/100 |
| 2 | 06403 | Beacon Falls | CT | 6/100 | 50/100 |
| 3 | 06405 | Branford | CT | 6/100 | 50/100 |
| 4 | 06410 | Cheshire | CT | 6/100 | 37/100 |
| 5 | 06418 | Derby | CT | 6/100 | 50/100 |
| 6 | 06437 | Guilford | CT | 6/100 | 50/100 |
| 7 | 06443 | Madison | CT | 6/100 | 50/100 |
| 8 | 06450 | Meriden | CT | 6/100 | 41/100 |
| 9 | 06451 | Meriden | CT | 6/100 | 49/100 |
| 10 | 06460 | Milford | CT | 6/100 | 50/100 |
| 11 | 06461 | Milford | CT | 6/100 | 50/100 |
| 12 | 06471 | North Branford | CT | 6/100 | 50/100 |
| 13 | 06472 | Northford | CT | 6/100 | 50/100 |
| 14 | 06473 | North Haven | CT | 6/100 | 43/100 |
| 15 | 06477 | Orange | CT | 6/100 | 50/100 |
| 16 | 06478 | Oxford | CT | 6/100 | 50/100 |
| 17 | 06483 | Seymour | CT | 6/100 | 50/100 |
| 18 | 06488 | Southbury | CT | 6/100 | 33/100 |
| 19 | 06492 | Wallingford | CT | 6/100 | 41/100 |
| 20 | 06510 | New Haven | CT | 6/100 | 50/100 |
| 21 | 06511 | New Haven | CT | 6/100 | 50/100 |
| 22 | 06512 | East Haven | CT | 6/100 | 50/100 |
| 23 | 06513 | New Haven | CT | 6/100 | 50/100 |
| 24 | 06514 | Hamden | CT | 6/100 | 50/100 |
| 25 | 06515 | New Haven | CT | 6/100 | 50/100 |
| 26 | 06516 | West Haven | CT | 6/100 | 50/100 |
| 27 | 06517 | Hamden | CT | 6/100 | 50/100 |
| 28 | 06518 | Hamden | CT | 6/100 | 50/100 |
| 29 | 06519 | New Haven | CT | 6/100 | 50/100 |
| 30 | 06524 | Bethany | CT | 6/100 | — |
| 31 | 06525 | Woodbridge | CT | 6/100 | 50/100 |
| 32 | 06702 | Waterbury | CT | 6/100 | 65/100 |
| 33 | 06704 | Waterbury | CT | 6/100 | 63/100 |
| 34 | 06705 | Waterbury | CT | 6/100 | 65/100 |
| 35 | 06706 | Waterbury | CT | 6/100 | 65/100 |
| 36 | 06708 | Waterbury | CT | 6/100 | 63/100 |
| 37 | 06710 | Waterbury | CT | 6/100 | — |
| 38 | 06712 | Prospect | CT | 6/100 | 64/100 |
| 39 | 06716 | Wolcott | CT | 6/100 | 46/100 |
| 40 | 06762 | Middlebury | CT | 6/100 | 48/100 |
| 41 | 06770 | Naugatuck | CT | 6/100 | 65/100 |
| 42 | 06001 | Avon | CT | 1/100 | 83/100 |
| 43 | 06002 | Bloomfield | CT | 1/100 | 83/100 |
| 44 | 06010 | Bristol | CT | 1/100 | 82/100 |
| 45 | 06013 | Burlington | CT | 1/100 | 83/100 |
| 46 | 06016 | Broad Brook | CT | 1/100 | 83/100 |
| 47 | 06019 | Canton | CT | 1/100 | 83/100 |
| 48 | 06023 | East Berlin | CT | 1/100 | — |
| 49 | 06026 | East Granby | CT | 1/100 | 67/100 |
| 50 | 06027 | East Hartland | CT | 1/100 | — |
| 51 | 06032 | Farmington | CT | 1/100 | 81/100 |
| 52 | 06033 | Glastonbury | CT | 1/100 | 82/100 |
Methodology
Gas risk rankings use PHMSA gas distribution incident data (2004-2026), mapped to counties and ZIP codes. Risk scores (0-100) factor in total incidents, fatalities, and recency. Counties with more incidents, deaths, and recent events score highest. Data source: U.S. DOT Pipeline and Hazardous Materials Safety Administration.
Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-10-18.
Frequently Asked Questions
What is a gas distribution incident?
Gas distribution incidents involve failures in the local natural gas pipeline network — the pipes that carry gas from main lines to homes and businesses. These can cause explosions, fires, carbon monoxide poisoning, and property damage. PHMSA tracks all reported incidents nationally.
How can I protect my home from CO and gas leaks?
Install CO detectors on every level of your home (CPSC recommendation). Have gas appliances inspected annually by a licensed technician. Know the signs of a gas leak: rotten egg smell, hissing near gas lines, dead vegetation near pipelines. If you smell gas, leave immediately and call 911.
Explore More Rankings
- Worst ZIP Codes for Lead in Water in Connecticut
- ZIP Codes with Most EPA Violations in Connecticut
- Lowest Home Safety Scores in Connecticut
- Highest Home Safety Scores in Connecticut
- Historical NFIP Claim Counts in Connecticut
- ZIP Codes with Highest Energy Costs in Connecticut
- EPA Radon Zone 1 ZIP Codes in Connecticut
- ZIP Codes with PFAS Detections in Connecticut
- Least Reliable Water Systems in Connecticut
- Environmental Justice Concern Areas in Connecticut
- Worst ZIP Codes for Homebuyers in Connecticut
- Safest ZIP Codes for Gas & CO Risk in Connecticut
- ZIP Codes with Worst Wildfire Smoke Risk in Connecticut
- Safest ZIP Codes for Wildfire Smoke in Connecticut
- All Rankings