Out of 10 counties with PHMSA gas distribution data, these are the counties with the highest incident risk.
| Statistic | Value |
|---|---|
| Counties ranked | 10 |
| Total incidents (top 100) | 42 |
| Total fatalities (top 100) | 4 |
Top 10 Counties
| Rank | County | State | Incidents | Fatalities | Latest Year | Risk Score |
|---|---|---|---|---|---|---|
| 1 | Middlesex | Massachusetts | 10 | 2 | 2021 | 9/100 |
| 2 | Essex | Massachusetts | 8 | 1 | 2019 | 30/100 |
| 3 | Suffolk | Massachusetts | 6 | 0 | 2017 | 3/100 |
| 4 | Norfolk | Massachusetts | 4 | 0 | 2023 | 9/100 |
| 5 | Plymouth | Massachusetts | 4 | 0 | 2015 | 4/100 |
| 6 | Bristol | Massachusetts | 4 | 1 | 2018 | 4/100 |
| 7 | Worcester | Massachusetts | 3 | 0 | 2013 | 9/100 |
| 8 | Hampden | Massachusetts | 2 | 0 | 2012 | 17/100 |
| 9 | Hampshire | Massachusetts | 1 | 0 | 2019 | 1/100 |
| 10 | Berkshire | Massachusetts | 0 | 0 | — | 1/100 |
Methodology
County rankings for Massachusetts based on total PHMSA gas distribution incidents reported since 2004.
Data source: U.S. DOT Pipeline and Hazardous Materials Safety Administration (PHMSA), Gas Distribution System Incident Reports 2004-2026. Last updated: 2026-06-04.
Frequently Asked Questions
What is a gas distribution incident?
Gas distribution incidents involve failures in the local natural gas pipeline network — leaks, ruptures, explosions, and equipment failures that can cause property damage, injuries, and fatalities. PHMSA requires all operators to report significant incidents.
How can I protect my home?
Install CO detectors on every level (CPSC recommendation). Have gas appliances inspected annually. Know the signs of a gas leak: rotten egg smell, hissing near gas lines, dead vegetation near pipelines. If you suspect a leak, leave immediately and call 911.