A further two people have been warned for possessing cannabis.
Masterton's Detective Senior Sergeant Barry Bysouth said last week's operation was the conclusion of an investigation into the supply of illegal drugs throughout the district.
"We continue to pursue the supply of drugs at whatever level as the harm on the community, particularly on young persons, is not lost on us.
"There are no winners when it comes to the misuse of illicit drugs. Although crime is an obvious contributor to the use and supply of drugs, there are other aspects of this clandestine culture which affect our community more subtly such as health, education and child protection."
Mr Bysouth said police needed people's help to prevent the supply of illegal drugs.
"Drug dealing is one of those types of offences where we rely heavily on information from the public and without that information we can't fix it.
"I am often told, 'There is a problem with drugs in this area, what are the police doing about it?' But we don't know what we don't know, so I would appeal to the public to tell us and then we can put appropriate resources into the problem."
He urged people to seek help for those they knew with a drug problem.
"If you know someone who needs help because of their drug addiction and you don't want to talk to the police, please stand up and at least tell someone.
"Wairarapa has many agencies who will do what they can to help someone who wants to be helped."
