Isle of Palms has three quite different kinds of property, and what goes wrong depends on which one you have.
Villas and condos
Wild Dunes villas are now decades old, and the fittings inside them are often original. Shut-off valves seized with age, supply lines that have never been changed, and shower cartridges that have not been touched since the building went up. In a stacked property those are worth replacing before they fail rather than after, because a leak affects more than your own unit.
Older beach cottages
The remaining older houses have the usual island story — corroded fittings, tired hose bibs, and pipe supports under the house that have rusted through.
Larger newer homes
Modern pipe, but a great deal more of it, plus recirculating pumps, outdoor kitchens and irrigation. Here the failures are at connections and equipment rather than in the pipe itself.
Salt reaches all three
Whatever you own, salt air corrodes metal faster than it does inland. Anything we fit outside or underneath should be specified for coastal conditions, and we would rather explain that than quietly use the cheaper part.