Waters touched the woman's genitalia four times and simulated sexual intercourse.
He first appeared in court on December 21, that same year.
Waters, aged in his 50s, went on trial on May 1 this year. The jury found him guilty on five charges.
He was convicted and issued a first strike warning by Judge Glen Marshall and remanded on bail for sentencing later this month.
He had been granted name suppression from the date of his first appearance until it lapsed in March 2016.
Waters declined to comment when contacted by the Herald.
Waikato police area commander Superintendent Bruce Bird said he couldn't comment about the case as it was still before the courts.
However, he confirmed the officer had been stood down since charges were laid in 2015.
A police spokesperson confirmed an officer is the subject of an employment investigation in relation to off-duty behaviour.
He has been stood down on pay since July 2015.
Waters' lawyer, Phil Morgan QC, also declined to comment.