The most common toilet problem in Summerville is not a dramatic one. It is a toilet quietly running and adding to a water bill nobody has questioned.
Hard water and flapper failure
Mineral content in Summerville water attacks flappers and fill valves faster than softer supply does. The seal stiffens, stops seating properly, and the tank refills every few minutes. It is a cheap part and a quick fix, and it is worth doing as soon as you hear it.
Builder-grade fixtures reaching their limit
A lot of Summerville housing went in during the same period with the same specification of fixtures, and those are now failing on a similar timetable. If yours is original to a mid-2000s build and needing repeated attention, replacement is often the better value than a third round of parts.
Rocking, leaking at the base, or sweating
A toilet that moves has usually failed at the wax seal, and water is getting into the subfloor whether you can see it or not. On slab construction that shows up as damage to flooring around the base. This is worth attending to quickly rather than living with.