A colleague and I were called to a home years ago where sewage was backing up into the basement. We investigated the basement drain where the washing machine was connected to see if water backed up when it was running upstairs. We snaked the drain and found no blockage. When we went outside and opened the septic tank access, we found that the level in the tank was above the outlet. When we investigated the drainfield all of the trenches were filled. The conclusion was that the drainfield failed and needed to be replaced.The yard was framed by several rows
