re: Should I be Calling Plumber or Septic Tank Company Question

It drains in to a ditch. Basically from the clean out of the house it goes in to this big box they buried in the ground. That thing has a tail line that goes to the ditch and connects to a backflow preventer. Water drains out there in to that ditch. I think the builder referred to the unit as a sewage treatment plant not a septic tank. I use the word septic tank as it's something I picked up years ago to describe such devices.

I am a little concerned about the backflow preventer. That thing is barley above water. Basically just the top of the cap is above water. If you turn the cap a lot of bubbles come out like it's under pressure.