Kiara Police said there had been increased patrols around the reserve and at a targeted property on Northmoor Road.
Resident Neera Mukherjee said the community had seen more syringes and “adult activity” at the reserve.
“There has been feedback on social media of this behaviour and I personally have been advised by various residents that they have witnessed inappropriate behaviour in the reserve,” she said.
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READ NOWMs Mukherjee, a Jubilee Action Group member, said she feared she and her children could get pricked by a syringe.
Bassendean MLA Dave Kelly said residents did not want another summer of “drugs and mayhem”.
“Drug sales appeared to stop after the police raid and arrests but they have noticed drugs reappearing at the reserve,” he said.
“That is why residents now want a permanent solution to the drug problem.”
The tenants of the alleged drug house appeared in court on October 11 and pleaded not guilty.
The case was adjourned until December 21.