If there is standing water high enough to hit an electrical outlet or in an area with appliances or cords on the ground, use the breaker box to shut off power to the area before entering to avoid the risk of electrical shock. For a slow leak, catch water in a container and empty it outside. Beware of emptying it into any drains until you know the source of the leak. Dry out wet areas as soon as possible to reduce the risk of mold. A wet vac can help to suck up excess water and box fans and dehumidifiers help dry out the area. Lift carpet to soak up excess water beneath it. Contact a restoration company as soon as possible.