Customers and employees were evacuated from the Walmart at 3801 Tampa Road in Oldsmar after emergency crews detected elevated carbon monoxide readings inside. According to FOX 13 Tampa Bay, a monitor registered high readings while Palm Harbor Fire Rescue crews were treating a patient in the store. The incident was first described as a gas leak, then identified as carbon monoxide, WFLA reported.
Fire crews ventilated the building after the evacuation. The Hillsborough County Sheriff’s Office Marine Unit assisted with airboats, which FOX 13 reported were used to help ventilate the store. No injuries were reported in the Tampa Bay Times’ account.
What is known—and not known—about the source
Reports differ on whether overnight welding was connected to the readings. The Tampa Bay Times reported that Palm Harbor Fire Rescue said the leak followed overnight welding work. FOX 13, however, said it was not immediately clear whether the work caused the elevated carbon monoxide. The available accounts do not resolve that connection.
Carbon monoxide can be difficult to detect without monitoring: the Occupational Safety and Health Administration describes it as colorless and odorless. That general safety fact does not establish how the gas entered the Oldsmar store or what produced the readings.
A previous Florida Walmart evacuation offers a limited comparison
A separate incident illustrates that carbon monoxide evacuations can have different outcomes. The Orlando Sentinel reported that on August 9, 2015, a Walmart in Avalon Park was evacuated after unsafe levels were found; 13 people were treated and seven were hospitalized. The cause was still unclear in that report, which noted overnight remodeling work with propane tools. That incident is a comparison, not evidence that the two stores had the same cause or that such events are becoming more frequent.
The broader risk is not limited to retail stores. The Florida Department of Health cites national annual estimates of more than 400 deaths, 100,000 emergency department visits and 14,000 hospitalizations from unintentional carbon monoxide poisoning not linked to fires. Those figures provide public-health context, but do not describe the Oldsmar incident specifically.
