The peninsula floods. King tides, heavy rain and storm surge are facts of downtown life, and plumbing has to be planned around them.
Crawl spaces at or below the water table
Many historic houses sit on raised foundations over crawl spaces that take on water during tidal flooding. Standing water there attacks floor framing, ductwork and insulation, and in Charleston humidity it drives rot rather than simply drying out.
Backup power is not optional here
Downtown, heavy rain and power loss arrive together. A pump without battery backup is off exactly when the tide and the storm coincide. On the peninsula we treat backup as part of the installation rather than an upsell.
Check valves and discharge routing
Where the water goes matters on tight lots. Discharging against a neighbouring wall or back toward your own foundation is a common fault we find, and it defeats the purpose of the pump.
Test before hurricane season
Pour a bucket into the pit and confirm it starts, moves water, and stops cleanly. Two minutes in June is worth a great deal in September.