When the water will not stop
A cracked supply line can put a gallon on the floor every few seconds. A failed water heater tank can empty most of its volume into a garage before anyone notices the puddle under the door. Sewage backing up through a shower drain is a different kind of problem, but it is just as urgent because the water carries bacteria into everything it touches.
Every job here is done by a plumber who works to the plumbing codes adopted locally (built on the UPC and IPC model codes), and permit rules vary, so ask the City of Goose Creek building inspection division about yours. You can also check any plumber's licence at llr.sc.gov, the South Carolina LLR site.
Most houses have a main shutoff valve where the water line enters, and a meter box near the street. If you can reach the house valve, closing it buys time. The meter shutoff belongs to the utility, so leave that one alone and use the valve inside or beside your home.
The first five minutes
Turn off the main water valve, then open one faucet at the lowest point of the house to drain the pressure. Switch off power to any wet room at the breaker, and only if the breaker panel is dry and you can reach it without standing in water.
Move rugs, electronics and paperwork out of the wet zone. Then call, because the details you describe decide which plumber and which tools we send.
