Okay well it looks like you are up a creek here. I just found this on the city's website. I would move outside city limits or move the snake outside of city limits.
Chapter 8-9
DANGEROUS AND VICIOUS ANIMALS

Unless otherwise expressly stated or the context clearly indicates a different intention, the following terms shall, for the purpose of this Chapter, have the meanings in this Section:

(A) "DANGEROUS ANIMAL":
1. Any animal which is not naturally tame or gentle, and which is of a wild nature or disposition, and which is capable of killing, inflicting serious injury upon, or causing disease among, human beings or domestic animals and having known tendencies as a species to do so;
2. Any animals declared to be dangerous by the Board of Health of the County or the City Administrator or his/her designee;
3. The following animals which shall be deemed to be dangerous animals per se:
Lions,tigers,
jaguars,
leopards,
cougars,
lynx and bobcats;
Wolves,
coyotes and foxes;
Badgers,
wolverines,
weasels,
skunks and mink;
Raccoons;
Bears;
Monkeys and chimpanzees;
Bats;
Alligators and crocodiles;
Scorpions;
Snakes that are venomous or constrictors;
Gila monsters;

Section 8-9-2 Keeping Of Dangerous Animals Prohibited
No person shall keep, shelter, or harbor any dangerous animal as a pet, nor act as a temporary custodian for such animal, nor keep, shelter, or harbor such animal for any other purpose or in any other capacity within the City of Storm Lake, except as provided in Section 8-9-3 of this Code.