Orange County Fire Rescue said the bus, carrying nine students to Magnolia School, and a Jeep were involved in a crash. The bus traveled into a yard and through a fence before nosediving into the pool.
Troopers said the Jeep swerved to avoid a dead cat in the road, prompting the bus to drive off the road.
Fire Rescue tweeted that the driver of the Jeep suffered non-serious injuries. She was taken to a hospital, officials said.