Call the Poop Dudes First
If you have a blockage and cannot get water to drain, you could have a problem with the pipes inside your house. It could also be a problem with a backup or clog in which waste enters your tank. Plumbers are excellent, they know many things, but they often have no experience dealing with septic systems. They can only diagnose what is going on inside of your house. They usually do not touch any part of the septic system because they are not familiar enough with it to diagnose or treat the problem.