Portsea (postcode 3944) is part of Mornington Peninsula Shire, which sets bin collection days by street rather than by suburb — so the exact day varies address to address within Portsea itself.
Red-lidded bin, collected every week.
Yellow-lidded bin, collected every second week.
An opt-in additional service — not every property has a green waste bin, so it may not appear on your schedule.