@pee wee this is really too bad. You put a lot into that house from what I recall from your build thread. Sounds like your field is marginal. Here in western Chatham, soil that will drain well is hard to find. Before we purchased the lot we made it conditional on finding enough septic field for our needs. Thankfully we found it, but my wife HAD to put her shop in the middle of the best spot. 
Across the street, they wanted to put a chicken farm (I think it was) but the deal failed, thankfully, when they couldn’t find any septic area on the near 100 acres.
The area has a lot of what they call expansive clay, it’s basically brown dirt with gray clay. When we were buying the lot, the county came out and with a hand auger took samples from the yard and looked for areas of red clay. Those are the septic fields.
Back in OH where I grew up, under a couple of feet of top soil you would hit solid gray clay. For septic systems they would dig big pits with drainage pipe in them and put gravel in it then top it with dirt. At some point the county decided that was bad and started having people run X feet of leach line towards the top, like they do here. A house was built on a lot that was vacant for 30 years (for a reason) that used that system and after about two years, if you rode by, it stunk like a sewer. Eventually, the county went back to the gravel pit.
My parents field failed during those experimental years. The septic guy came out on Friday after the health department closed, dug a pit beside the old one and rerouted the septic to the new pit. It was covered over and had grass planted by Sunday afternoon.
Across the street, they wanted to put a chicken farm (I think it was) but the deal failed, thankfully, when they couldn’t find any septic area on the near 100 acres.The area has a lot of what they call expansive clay, it’s basically brown dirt with gray clay. When we were buying the lot, the county came out and with a hand auger took samples from the yard and looked for areas of red clay. Those are the septic fields.
Back in OH where I grew up, under a couple of feet of top soil you would hit solid gray clay. For septic systems they would dig big pits with drainage pipe in them and put gravel in it then top it with dirt. At some point the county decided that was bad and started having people run X feet of leach line towards the top, like they do here. A house was built on a lot that was vacant for 30 years (for a reason) that used that system and after about two years, if you rode by, it stunk like a sewer. Eventually, the county went back to the gravel pit.
My parents field failed during those experimental years. The septic guy came out on Friday after the health department closed, dug a pit beside the old one and rerouted the septic to the new pit. It was covered over and had grass planted by Sunday afternoon.
