If a sewer main requires repair because of the roots of trees, shrubs or other plants that are growing into or near the sewer main, the owner of the real property on which the trees, shrubs or other plants are located, or if the trees, shrubs or other plants are located on a street, the owner of the abutting real property, shall be liable for the costs, expenses and charges incurred by the City in the repair of the sewer main.