Collections are on Monday (Pukekawa east of Hwy 22), Tues (Pukekawa/wider Onewhero), Wed (Onewhero) and Sunday (Port Waikato/Port Road). Usually after a Monday public holiday the collections are delayed by one day (except for the Port which usually remains Sunday).
See pdf here for detailed map of areas.
Link for latest news and info: https://www.waikatodistrict.govt.nz/services-facilities/refuse-and-recycling/refuse-and-recycling-collection-days