"Every day Wanganui staff are doing a fantastic job helping communities be safe and feel safe, and it is also evident from this small number of cases that staff are working hard to ensure that public trust and confidence in police is further enhanced."
However, there were some exceptions.
"It is always disappointing when police staff do not meet the standards the public rightly expects, and on the rare occasion we identify individual staff members who fail to uphold the values of New Zealand Police," Mr Mastrovich said.
"All police staff are held to account under the law, just as any member of the public is, and we will not hesitate to investigate and take the appropriate course of action."
Nationally, 131 police officers faced criminal charges in the past five years.
The number of police charged was highest in 2013 at 35. Last year, 29 police were charged.
During the four years, 313 police received counselling, 373 were disciplined through professional conversation, 173 received performance management and an adverse report was filed for one police officer. A further 178 police were given first warnings, 63 second warnings, and 71 officers were given third and final warnings. Five officers were dismissed and five were reprimanded.
Meanwhile, 136 officers resigned and 17 retired during the disciplinary process.
Labour's police spokesman Kelvin Davis said any issues with police were regrettable.
"It is disappointing that there have been any disciplinary issues in the police at all but ... it is great that they are addressing areas of discipline and performance," he said.
He expected police were taking issues more seriously than they used to.
"There was obviously a spike in disciplinary action in 2012 and 2013 but, without an in-depth analysis of each case, it is hard to comment on reasons.
"Maybe the police were taking issues a lot more seriously and addressed things that in the past may have been overlooked, which is a good thing."
