Bins are being tagged if householders are putting the wrong things in their bins, Kwinana Mayor Carol Adams said.
"We don't have all the data yet, although the trends are looking positive," she said.
�From what we�ve seen people really want to do the right thing, but sometimes just lack the correct information. You can already see the change in individual households.
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READ NOW�In the first week people were putting their recycling in bags, but after we gave them feedback via the tags, they changed their behaviour and were leaving all their recycling loose in the bin.
"We're also noticing a reduction in the amount of recycling placed in the green waste bin."
Residents should place recyclables loose in the bin, not in plastic bags, and all items should be rinsed and the lids separated from jars and bottles.
Lids can be recycled but should not be attached.
The most common mistake involved people putting recyclables in their waste bin.
"You can recycle all cardboard, paper, plastic containers, plastic bags and metal containers," Cr Adams said.
The council also urged people to remove the plastic wrap from delivered newspapers.
Items like nappies, clothes, garden waste and food must go in the waste bin and electrical waste should be placed in the verge collection or taken to Henderson Waste Recovery Centre or another approved drop-off centre.
Batteries must be placed in a battery disposal bin either at the City Administration office or the Kwinana Public Library.