As johnjh2o wrote, you most likely have a problem with the leach field. Backups of toilet paper and sewage in the drain lines before the septic tank are commonly caused by the septic tank being flooded, which is commonly caused by water being unable to get out of the tank and be absorbed into the ground in the leach field. If your leach field is old, or marginal, those problems are frequently worse in wet weather. Your large number of users doesn't help! Assuming your septic tank has two access ports, take a look at the secondary (outlet) side: Is there water up to or over the outlet? That is a pretty clear indication of leach field problems. Depending on your soil, vegetation and other factors, the most common way to fix this is to rebuild the leach field. That either requires digging up and replacing the old failed field (piping, gravel, and what ever else your local codes require) or if you have the space, building a new field. About the same cost. As to your unclogging the lines, that is really a very temporary solution. As soon as the septic tank outlet becomes flooded (water over the outlet pipe), the paper and other waste will once again be unable to exit the plumbing. Pumping the tank is also a very temporary solution: As soon as the tank becomes full again, you are right back to lots of clogs. IMO, the septic pumping service should have inspected the lines that go to the leach field and advised as to their condition. I have lived with a septic system for over 30 years. Only had the tank pumped one time, and even then there was only a small amount of solids in the bottom of the tank. In our case, we are planning to put in a new leach field next spring, as we are experiencing occasional backups as you originally described.
Sounds like you have a problem with the drain field.
Companies around where I am, when they pump they also power wash the tank and inspect incoming and outgoing lines
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