The Sheboygan police responded to alligator sighting reports on July 20.
After capturing the exotic animal, it was turned over to the DNR.
Officials believe the alligator was abandoned by a pet owner.
Wisconsin law regulates the introduction, stocking and release of wild animals and violators can face a fine of $539.50 for the illegal release of a wild animal.
This case is still under investigation. Anyone with information is asked to contact the DNR at 1-800-TIP-WDNR.