A heating, ventilation, and/or air conditioning (HVAC) unit includes a drain pan including a basin defined by a base and a plurality of side walls configured to collect condensate from an evaporator of the HVAC unit. The HVAC unit also includes a drain port disposed in the base of the basin and arranged such that the drain pan is configured to direct the condensate toward the drain port and out of the basin, a protruded portion extending from an outer surface of a side wall of the plurality of side walls, and a passage proximate to a top edge of the side wall of the plurality of side walls and configured to facilitate overflow of the condensate out of the basin and along the protruded portion.