I think that depends on the state or country you are in I know if you are in NY of the USA its considered private property until the trash truck takes it or you personally take it to a dump...
Is trash considered private property?
Once you roll your bin to the curb or place your garbage bags on the sidewalk for pickup, you no longer have an expectation of privacy when it comes to your trash. In fact, it can even be searched by the police.
In
You must be registered to see the links
, a case heard by the Supreme Court in 1988, the court ruled that the police could conduct a warrantless search of trash that had been left for collection outside the curtilage of the home
The
You must be registered to see the links
, or lands immediately surrounding a home, according to distance,
what a fence encloses, the nature of the land's use and if the space can be easily observed