SAN MATEO — A former San Mateo police officer pleaded not guilty Tuesday to 22 felony sexual assault charges, according to the San Mateo County District Attorney’s Office.

Noah White Winchester, 31, of Stockton, is charged with kidnapping with intent to commit rape, rape, sexual penetration and oral copulation under color of authority, sexual battery, criminal threats and forcible sex.

Prosecutors have tied Winchester to five victims and contend the sexual assaults occurred between July 2, 2013, and Oct. 19, 2015, across two jurisdictions — San Mateo and the Los Rios Community College District in the Sacramento area — where he worked as a police officer.

Winchester, who joined the San Mateo Police Department in early 2015, was placed on leave in October when the allegations first came to light. He resigned his post in February.

Prosecutors said Winchester is slated to return to San Mateo County Superior Court Aug. 8 for a hearing on a motion to reduce his $3.1 million bail and to set a date for a preliminary hearing.

Contact Jason Green at 408-920-5006. Follow him at Twitter.com/JGreenMercNews.