To me these lines should have never have been run to the septic.
Do floor drains run to septic.
Many basement floor drains tie directly to the home s sewer system but in some communities local building codes require floor drains to run to a sump pit where a pump lifts the water to the exterior surface of the house.
The waste pipe must maintain a minimum 1 4 inch per foot slope at every point along its path to the septic tank.
Similarly the vent pipe must maintain the same minimum slope toward the toilet drain.
Basement floor drains don t get a lot of attention until the sewer backs up or the basement smells like an outhouse.
Are you sure that you do not have a cistern for collection of water to be used for watering the grass etc.
I recently learned that our basement floor drains are connected to our septic tank lateral field.
A real bozo no no.
You absolutely do not want to put the floor drains foundation water or gutter rain water into the septic system.
An ejector pump failure caused our floor drains back up and floods the basement.
How to run a septic tank line from your house.
It will wash the waste of the septic system out into the drain field and plug it.