The mystery surrounding why dozens of runners experienced “unusual symptoms” during the Santa Barbara Half Marathon on Sunday appears to have been solved.

Health officials are pointing to unusually high temperatures rather than the rumored possibility of contaminated water.

The Santa Barbara County Public Health Department said Monday that the illnesses appeared to be connected to heat and physical exertion during the 13.1-mile race, following widespread speculation that water stations along the course may have been contaminated or even 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 health department said in a press release.

24 patients were treated and released, while three remained in the hospital, according to the Associated Press.

Cottage Health initially raised alarms after reporting a “larger than expected number of emergency visits” involving patients with similar symptoms of an undetermined cause, prompting an investigation by the Santa Barbara Police Department.

Police said the runners had arrived at hospitals by ambulance, private transportation or as walk-ins.

Temperatures reached 80 degrees by 10 a.m. Sunday and climbed into the mid-80s later in the day, which is about 10 degrees warmer than typical conditions for the annual November event.

Rumors quickly spread across Reddit, Instagram and other social media platforms, with some speculating that water distributed along the course had been tampered with or contained drugs.

However, county health officials said environmental health inspectors found no violations or areas of concern when they examined the location where electrolyte drinks were prepared ahead of the race.

Inspectors visited the site Friday and Saturday before issuing temporary food permits and found that water supplies and other products were properly packaged and stored under sanitary conditions.

The inspections did not establish whether anyone could have tampered with the hydration stations during the event, and the police investigation remained ongoing, The Santa Barbara Independent reported.

In a statement, Santa Barbara Half Marathon organizers said they had been cooperating with local authorities and had no information suggesting the runners’ symptoms were caused by anything other than physical exertion during the race.

“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,” it reads.

Organizers also expressed sympathy for those who required medical attention and their families.

One mother whose daughter was hospitalized after participating in the race questioned whether heat alone could explain what happened.

The woman told the California Post that her daughter, who had trained extensively for the event, suddenly slowed down suddenly.

“She has no memory of the finish line,” the mother said, explaining that her daughter’s Garmin fitness tracker showed her pace dropping dramatically.

“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 before being taken to the hospital.

The mother expressed frustration with the initial suggestion that heat exhaustion was responsible, arguing that her daughter’s fitness level and preparation made the 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.

At the time, Santa Barbara Half Marathon event director David Monico maintained that 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.”

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