Spoke with the Franklin County Dept of Health folks about how to shut down the septic system and the well. The septic system just needs to be pumped out completely and then it can be collapsed. Since it's made out of concrete we can just crush it and fill it.
The well is a bit more involved. It has to be filled with this playdough like substance and then cut off a few feet below grade. We have to get quotes on this from a well driller. It sounds like it should cost <$400 to close down the well.
