Prosecutors say that Araiza, who teaches at Terra Nova High School, was indicted by a federal grand jury on April 2, was arrested on April 3 and pleaded not guilty to the charges when he was arraigned on Monday.
Araiza is scheduled to return to U.S. District Court in Oakland this morning for a detention hearing before Magistrate Judge Wayne Brazil.
The U.S. Attorney's office says the case was investigated by U.S. Immigration and Customs Enforcement and the U.S. Department of Homeland Security with assistance from the Pacifica Police Department and the child exploitation and obscenity section of the U.S. Department of Justice's criminal division.
Prosecutors say the maximum penalty for receiving child pornography is 20 years in federal prison, with a five-year mandatory minimum sentence, and a $250,000 fine.
The maximum penalty for possessing child pornography is 10 years imprisonment and a $250,000 fine.
Assistant U.S. Attorney Andrew Huang is prosecuting the case with the assistance of lead legal assistant Cynthia Daniel.