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I’d get the soil tested so you can get an optimal system. There are lots of good pieces of advice but I’ll add one more: overbuild by a bit.
Most housing codes require a certain size of septic tank depending on the number of rooms so if your tank is built for a 3 bedroom house, you can’t add rooms or decide that a study is now a “bedroom” if you decide to sell. The cost difference between a 3 bedroom tank and a 4bedroom tank (or 4 versus 5) is comparatively small now. If you ever decide to add a bedroom or call something a bedroom in the future, digging it up and expanding it is a giant smelly hassle and expensive. I suggest that even if you’re building a 3bedroom house, put in a septic tank that would fit codes for a 4or 5bedroom house just for that possibility.
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