I’d tackle this as a mix of design, communication, and gentle enforcement rather than confrontation. First, make the bin less convenient for household bags: smaller openings, locked lids, split compartments, or a heavy self-closing lid can help. Add clear signage saying “No household waste” and point people to the nearest official disposal or collection point. If the bin is in a poorly lit spot, ask your city or property manager to improve lighting and consider a camera or dummy camera, as long as local privacy rules are followed.
Talk to nearby residents and businesses, because household garbage in public bins often comes from a few repeat sources. A short building notice or neighbor chat can remind people that these bins are for street waste only. Ask your local sanitation department for a bin audit, more frequent pickups, or a better location—sometimes an overflowing bin invites misuse. If allowed, set up a simple reporting system with your council or property manager so people can report illegal dumping with time, place, and photos. Avoid confronting anyone yourself. Consistent signage, better bin design, community education, and local enforcement usually work best together.