When I had my septic system put in my installer told me that if I routinely pumped it every other year then it would last a lifetime. And I have.
Now, there are other factors to keep in mind; Do you have a garbage disposal and do you use it routinely? A garbage disposal seriously taxes the septic system.
Also, do you have a dishwasher and clothes washer?
I do have a garbage disposal but don't use it other to clean the small crumbs out of the sink after a meal. I use the trash for 99% of my garbage.
Treat your system well and it will treat you well.
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