More than 20 charges were laid after Harvey and Yarloop Police carried out a series of search warrants in Harvey and Waroona last month.
Along with seizing stolen property, drugs, and implements, police charged four people with various offences.
Five people were also charged after police conducted a search in Waroona on November 29.
The nine received a total of 23 charges - 10 counts of possessing drug paraphernalia, six counts of possessing a prohibited drug, five counts of offering to supply a prohibited drug, one count of stealing as a servant, and one count of possessing unlicensed ammunition.
They will appear in the Harvey Magistrates Court at a later date.
"The public is encouraged to provide information to the Police either by attending their local Police Station or by phoning Crime Stoppers," Harvey Police acting sergeant Adrian Koekemoer said.