Four people were arrested and charged with drug offences following search warrants this week.
Police carried out six searches in Whanganui on Wednesday and laid a range of charges, including drug-related ones.
Five people were also taken into custody in relation to outstanding arrest warrants.
The searches came as part of a Central Police District coordinated effort from Levin to New Plymouth to prevent home burglaries.
"A substantial amount of property has been recovered, including furniture and household electronics, which will be identified and returned to their rightful owners," a police spokesman said.