According to your city government's website (you mentioned the name of your city to me a while ago):
What they consider litter is "Any quantity of uncontainerized paper, metal, plastic, glass or miscellaneous solid waste which may be classified as trash, debris, garbage or junk."
They state: "It shall be unlawful to throw or deposit litter on any private property within the City, whether owned by such person or not, and whether occupied or vacant."
The penalties are a fine of $150 and/or 20hrs of commmunity service. Repeated offenses increases the fine and number of hours.
However, it all depends if the police actually enforce those ordinances.