Westmead (postcode 2145) is part of City of Parramatta, which sets bin collection days by street rather than by suburb — so the exact day varies address to address within Westmead itself.
Red-lid bin, collected every week.
Yellow-lid bin, collected every second week — your street is in either "Area 1" or "Area 2", which sets which week.
Green-lid bin for food and garden organics, collected every week.
Westmead is part of City of Parramatta, which sets bin day by street rather than by suburb — enter your exact address on BinDayTracker to see your next collection date for each bin type.