Trash Bin abuse in multifamily

[Jason Thomas]

I have a small 5 unit apartment complex where the trash bin from waste management is now overflowing for every pickup costing me 3x the normal cost because of overages. We purchased the property about 4 months ago and didn't have any issues until now. Assuming the trash was coming from a nearby apartment complex, we put a lock and gave the combo to only our 5 tenants. Within 1 week, the lock was missing and trash was overflowing again. We put another lock and the same thing happened. Any advice on how to resolve this issue? This is eating into profits significantly due to the extremely high charges from WM at pickup.