This depends on the jurisdiction. On the first offense, it is usually a written warning. Repeat offenses or serious messes start with $20-$100 files. Serial littering and dumping are several hundred dollar fines.
It varies greatly not only from state to state but even between cities. The fine is set by the city or the county for rural areas. I have seen ranges from $50 to $200. Social pressure will stop littering before fines ever will.