Charlotte Christian also has an open recreational swim team. SwimMac takes care of that pool now so go through their website to sign up. Practice starts next week. I think they are called Sharks. it would definitely be different from their year round competitive swim program.
You can also go here to see who is part of the greater Charlotte swim league. Many of the teams are neighborhood swim teams that you can't join, but if you do some searching, you might find some that let outsiders join.
http://www.greatercharlotteswimleagu...hedule/results
EDIT - this link my be more useful to you
http://www.greatercharlotteswimleagu...te-swim-league . There is contact info if you're interested in joining a team. That person might be able to help you find a pool near you.