At around 12:25 p.m. Thursday, firefighters responded to a report of a possible unknown hazard with one person reporting symptoms at the high school.
The first officials on scene reported an unknown odor from a drain at building C, leaving a total of 4 patients. The patients have been described as three adults and one minor.
The patients were evaluated by paramedics and transported to an area hospital, where all four are being treated for minor injuries.
The Riverside County Fire Department's Hazardous Materials Team later determined there to be no hazard from the smell emitted from the sewer.