Can I put a drain line through the footer of the house? The house is on a cement slab, built in 1964 in Florida. I want to put a bathroom in the garage. The sewer drain line that I will lay on the outside of the house will only be 8" under the soil to allow for the 1/4" per foot drop. So I will have to drill through the slab and through the footer to get to it. Is it a problem to damage 4-6" of the footer? Thank you for your answers.