Septic systems can be a giant pain in the arse.
We've had them, had them installed in houses in Florida and Oklahoma....
When we built here at the ranch 4 years ago, we put up two small houses. one 900 sq. ft., one 1600. They are both tied to a large AEROBIC system, which are monitored twice a year by the company that installed the system. It was $7,000.00 to install for both houses, but nary a problem so far...
There are sprinkler heads on top the ground that spews out treated water and keep the lawn green... We like it.
DonnaBelle