Triple-digit temperatures in the Southwest and West United States in the past week have already played a factor in at least two deaths, according to news reports.

Because of this, Cal/OSHA is reminding employers with outdoor workers they must provide fresh water and encourage workers to stay hydrated in order to prevent heat illness.

“It is tragic when someone dies of hyperthermia since in most every case it could have been prevented,” Dr. Michelle Jorden, Medical Examiner, Santa Clara County Coroner’s Office in a statement to the press.