The mystery behind the “unusual symptoms” reported by dozens of runners at Sunday’s Santa Barbara Half Marathon now appears to have an explanation.
Health officials say the illnesses were likely caused by elevated temperatures and strenuous exercise—not contaminated water, as social media rumors suggested.
The Santa Barbara County Public Health Department said Monday night that the medical incidents appeared to be linked to the 13.1-mile race and the day’s heat. Speculation had circulated that water stations along the course may have been contaminated or deliberately spiked.
“At this time, the medical incident appears to be an isolated event connected directly to race participation and the heat.
“There is no indication of a broader public health concern or ongoing risk to the community,” the department said in a statement.
According to the Associated Press, 24 patients were treated and released, while three others remained hospitalized.
Cottage Health first drew attention to the situation after reporting a “larger than expected number of emergency visits” involving patients with similar, unexplained symptoms. The report prompted an investigation by the Santa Barbara Police Department.
Police said the runners reached area hospitals by ambulance, private vehicle and as walk-in patients.
Temperatures hit 80 degrees by 10 a.m. Sunday before rising into the mid-80s later in the day—roughly 10 degrees warmer than usual for the annual November race.
As reports spread, rumors gained traction on Reddit, Instagram and other social platforms. Some users alleged that water handed out along the course had been tampered with or laced with drugs.
County health officials, however, said environmental health inspectors found no violations or other concerns at the site where electrolyte beverages were prepared before the event.
Inspectors visited the location Friday and Saturday, then issued temporary food permits after confirming that water and other supplies were sealed, properly stored and handled under sanitary conditions.
The inspections did not determine whether hydration stations could have been tampered with during the race. The police investigation was still active, The Santa Barbara Independent reported.
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Organizers of the Santa Barbara Half Marathon said they were cooperating with authorities and had seen no evidence that the runners’ symptoms resulted from anything beyond the physical demands of the event.
“At this point we have no additional information to suggest that the issues some of the participants experienced were caused by anything other than endurance event exertion-related symptoms,” organizers said.
They also offered their sympathy to the affected runners and their families.
One mother whose daughter was hospitalized after competing in the race remained skeptical that heat alone explained the incident.
The woman told the California Post that her daughter had trained extensively but suddenly began slowing during the race.
“She has no memory of the finish line,” the mother said, noting that her daughter’s Garmin fitness tracker showed a sharp decline in her pace.
“She said she saw it and it felt like she was running through Jell-O,” the mother recalled.
Her daughter eventually regained consciousness in the race’s medical tent and was later transported to a hospital.
The mother said she was frustrated by the early suggestion that heat exhaustion was to blame, arguing that her daughter’s fitness and preparation made that explanation difficult to accept.
“Santa Barbara in November, no one’s going to knock over from the heat unless you’re completely wildly unprepared,” she said.
Santa Barbara Half Marathon event director David Monico said the medical emergencies were consistent with heat-related illness.
“Our medical team treated numerous runners for dehydration and overheating both on the course and at the finish line,” Monico said in a statement. “Some of those runners were transported to local hospitals for further treatment and enhanced care.”
He also told Noozhawk that organizers had “no reason to believe that it’s anything more than just the heat and exhaustion from the half marathon.”
