Televised ducts under slab floor. Ducts are clay tile and there was standing water in the ducts. The water in the rear of the house smells of sewer water.ushd camera into area near the kitchen sink ran water and saw water in ducts moving indicates no a leak in the kitchen Chen sink drain line under the slab. Homeowner should get a plumber repair the kitchen drain line. Once that is done the ducts should be spray lining Ned to encapsulate the contaminated ducts.