I had to built a new septic system for 75 homes two years ago. The engineer’s plan called for a 3,000 gallon tank for each row of 10 homes.
The proper way to maintain a septic system is not to have a pumping schedule, but to have a core sampling schedule and then pumping when it is necessary.
Here is the core sampler I made a few weeks ago for $80. It will reach down 16’ to the bottom of the tanks.
