Investigators say a tip from the public led them to search the northeast-area residences last Thursday and arrest three people.
Drugs that included crack cocaine, codeine, morphine and Oxycodone were seized, along with $44,000 cash, drug paraphernalia, swords, knives and other weapons.
Raymond Michael Carignan, Scott McKay Duguay and Glenn Jones, who are all in their 50s, face multiple drug and weapons-related charges.
The property owners were also issued warnings that legislation could be used to shut the homes down and remove the residents if the alleged illegal activity didn't stop.
Police say the owners have been co-operative and have issued eviction notices to their tenants.