Find the main shutoff today
Walk the house and look where the supply pipe enters. A split-level may keep it in a lower utility room, and a ranch may keep it in the garage or a hall closet. A round handle turns clockwise to close, a lever turns a quarter turn. A valve that is stuck needs replacing, so tell us.
Pick up anything that can soak up water, such as rugs, cardboard boxes and extension cords, once the flow has stopped. Do not touch a wet outlet or switch.
When the cause is cold
Across 2015 to 2024 the Little Rock readings show about 53 days a year with lows at or under 32°F. That is enough cold to split an exposed pipe, and the split may stay hidden until the thaw, then show up as a ceiling stain or a wet cabinet floor. The pipe freeze risk checker scores your own pipes.