Conwy County Borough Council has moved to a four-weekly collection for residual waste, the first council in England or Wales to take this step.
This followed a year-long trial, which the council said had seen residents increase recycling rates.
The council has developed an app to help residents determine whether something can be recycled, and they can also send the council photographs of items about which they are unsure.
It said half the material found in its residual waste bins during the trial could have been recycled, so cutting its landfill cost by £1.6m a year.
Under the new system, Conwy will provide weekly collections for food waste, paper, card, Tetra Paks, cans, aerosols, foil, glass, plastic bottles, tubs and trays and batteries. There will also be weekly nappy and incontinence products collections where needed.
Fortnightly collections will be made for green waste, textiles and small electrical waste.