Out of 13 counties with PHMSA gas distribution data, these are the counties with the highest incident risk.
| Statistic | Value |
|---|---|
| Counties ranked | 13 |
| Total incidents (top 100) | 76 |
| Total fatalities (top 100) | 0 |
Top 13 Counties
| Rank | County | State | Incidents | Fatalities | Latest Year | Risk Score |
|---|---|---|---|---|---|---|
| 1 | Maricopa | Arizona | 20 | 0 | 2024 | 11/100 |
| 2 | Apache | Arizona | 20 | 0 | 2024 | 11/100 |
| 3 | Cochise | Arizona | 20 | 0 | 2024 | 11/100 |
| 4 | Navajo | Arizona | 4 | 0 | 2017 | 2/100 |
| 5 | Pima | Arizona | 3 | 0 | 2019 | 3/100 |
| 6 | Yavapai | Arizona | 2 | 0 | 2013 | 2/100 |
| 7 | Pinal | Arizona | 1 | 0 | 2007 | 11/100 |
| 8 | Gila | Arizona | 1 | 0 | 2007 | 5/100 |
| 9 | Coconino | Arizona | 1 | 0 | 2010 | 2/100 |
| 10 | Yuma | Arizona | 1 | 0 | 2008 | 1/100 |
| 11 | Graham | Arizona | 1 | 0 | 2015 | 1/100 |
| 12 | Santa Cruz | Arizona | 1 | 0 | 2004 | 1/100 |
| 13 | Mohave | Arizona | 1 | 0 | 2007 | 0/100 |
Methodology
County rankings for Arizona 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.