ISO Central Pennsylvania (Harrisburg) Swimmers/Teams/Pools

I travel to visit my mom in Pennsylvania two/three times a year and have a hard time getting in any swim workouts because there are so few pools in her area. I've done a search here in the USMS site and mostly come up with Pittsburgh/Philly teams. I have only found one pool close to her that allows drop ins and one masters team (both at the same location). That group is called Dumpster Fish (haha, funny name, right?!?) and they swim at the Friendship Center in Harrisburg. I'm just curious if there are other pools/groups in the area that I'm not finding in my searches. I'd be looking at Harrisburg and points north, as York and Lancaster are too far. Thanks! Amanda